Patent Publication Number: US-2023150440-A1

Title: Interior Camera System for a Self Driving Car

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     The present application is a continuation of U.S. patent application Ser. No. 17/239,972, filed Apr. 26, 2021, which is continuation of U.S. patent application Ser. No. 16/718,462, filed Dec. 18, 2019 and issued as U.S. Pat. No. 11,017,248 on May 25, 2021, the entire disclosures of which are incorporated herein by reference. 
    
    
     BACKGROUND 
     Autonomous vehicles, such as vehicles that do not require a human driver, can be used to aid in the transport of passengers from one location to another. Such vehicles may operate in a fully autonomous mode without a person providing driving input, or in a partially autonomous mode with a driver having control over one or more aspects of vehicle operation. 
     BRIEF SUMMARY 
     The technology relates to an interior sensor system for use with vehicles that can operate in an autonomous driving mode. The sensor system includes visible and near infrared (IR) sensors to see the vehicle&#39;s cabin in all ambient lighting conditions. According to certain, aspects, the system can he used to monitor occupants for safety purposes, including whether seatbelts are being worn properly. It can also be used to detect the cleanliness of the cabin and storage areas, for instance to schedule maintenance or service should the vehicle need to be cleaned. In addition to this, the in-vehicle sensor system can be used for rider support, including providing a videoconference capability with a remote assistance service, as well as to detect whether packages or other objects have been inadvertently left in the vehicle, whether a person is near the open trunk before closing the trunk lid, whether a passenger or pet has a hand, paw or other appendage outside an open window, etc. 
     According to one aspect, an interior sensing system fora vehicle configured to operate in an autonomous driving mode is provided. The interior sensing system includes a plurality of image sensors disposed along different surfaces within an interior area of the vehicle, The plurality of image sensors are configured to capture images of the interior area of the vehicle. The system also includes one or more infrared units configured to illuminate one or more zones within the vehicle during image capture by the plurality of image sensors, as well as a control system operatively coupled to the plurality of image sensors and the one or more infrared units. The control system includes one or more processors configured to initiate image capture by the plurality of image sensors in accordance with a predetermined ride checklist, receive captured imagery from the plurality of image sensors in response to the predetermined ride checklist, perform processing of the received imagery to detect a current status of the interior area of the vehicle based on detected objects or conditions within the vehicle, and cause one or more systems of the vehicle to perform an action based on the current status of the interior area of the vehicle. The predetermined ride checklist may be selected from a pre-ride checklist, a mid-ride checklist, and a post-ride checklist based on a current ride status. 
     The control system may he further configured to determine an amount of ambient light, and to actuate the one or more infrared units in response to the determined amount of ambient light. Here when the predetermined ride checklist is a mid-ride checklist and the determined amount of ambient light is below a threshold level, the control system may be configured to prevent illumination by one or more interior visible cabin lights. 
     In one scenario, the plurality of image sensors is disposed along different surfaces within the interior area of the vehicle to obtain imagery from a plurality of zones within the vehicle. The plurality of zones may be ranked according to multiple priority levels. At least one of an image capture rate and an image resolution in each of the plurality of zones may be based on the priority level corresponding to the zones. A field of view for a given one of the plurality of image sensors focused on a selected zone may be based on the priority level for the selected zone. 
     In another scenario, the predetermined ride checklist is a pre-ride checklist and the current status indicates that there is an object in the vehicle or service is required. Here, the control system is configured to cause a communication system of the vehicle to perform the action of contacting a remote facility to service the vehicle or remove the object. Contacting the remote facility to service the vehicle may include a request to either clean the vehicle or to reset a vehicle component to a default setting. 
     In a further scenario, when the predetermined ride checklist is a post-ride checklist and the current status indicates that there is an object in the vehicle from a prior passenger, the control system is configured to cause a communication system of the vehicle to contact a remote facility to remove the object from the vehicle, contact the prior passenger regarding the object in the vehicle, or contact both the remote facility and the prior passenger regarding the object in the vehicle. Contacting the prior passenger may include informing the prior passenger what type of object was left in the vehicle and where the object can be retrieved. 
     In an example, causing one or more systems of the vehicle to perform the action based on the current status of the interior area of the vehicle includes causing a planning system of the vehicle to plan a change in route. Each of the one or more infrared units may he collocated with a corresponding one of the plurality of image sensors. Alternatively, each of the one or more infrared units may he located separately from the plurality of image sensors and arranged to avoid flare during image capture by the plurality of image sensors. At least one of the one or more infrared units may be further configured to provide illumination in at least part of the visible light spectrum. 
     In another example, initiation of the image capture by at least one of the plurality of image sensors includes performing high dynamic range image capture using a plurality of different exposure levels. And processing of the received imagery to detect the current status may include the one or more processors performing a machine learning operation to determine whether a given one of the plurality of image sensors requires cleaning or if there is an obstruction of the given image sensor. 
     According to another aspect, a method of controlling an interior sensing system for a vehicle configured to operate in an autonomous driving mode is provided. The method comprises initiating, by one or more processors, image capture by the plurality of image sensors in accordance with a predetermined ride checklist, the predetermined ride checklist being stored in memory of a control system of the vehicle; in response to the predetermined ride checklist, the one or more processors receiving captured imagery from a plurality of image sensors disposed along different surfaces within an interior area of the vehicle, the plurality of image sensors being configured to capture images of the interior area of the vehicle; the one or more processors performing processing of the received imagery to detect a current status of the interior area of the vehicle based on detected objects or conditions within the vehicle; and the one or more processors causing one or more systems of the vehicle to perform an action based on the current status of the interior area of the vehicle. 
     In one example, the method further comprises determining an amount of ambient light; actuating one or more infrared units disposed within the interior area of the vehicle in response to determining the amount of ambient light; and when the predetermined ride checklist is a mid-ride checklist and the determined amount of ambient light is below threshold level, preventing illumination by one or more interior visible cabin lights. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIGS.  1 A-B  illustrate an example passenger-type vehicle configured for use with aspects of the technology. 
         FIG.  2    illustrates in interior vie v of the vehicle of  FIGS.  1 A-B  in accordance with aspects of the technology. 
         FIG.  3    is a block diagram of systems of an example vehicle in accordance with aspects of the technology. 
         FIGS.  4 A-B  illustrate example views of interior sections of a vehicle in accordance with aspects of the technology. 
         FIGS.  5 A-F  illustrate vehicle regions and priorities in accordance with aspects of the technology. 
         FIGS.  6 A-B  illustrate an example of a pre-ride check in accordance with aspects of the technology. 
         FIGS.  7 A-B  illustrates an example of a mid-ride check in accordance with aspects of the technology. 
         FIGS.  8 A-B  illustrates an example system in accordance with aspects of the technology. 
         FIG.  9    illustrates an example method in accordance with aspects of the technology, 
     
    
    
     DETAILED DESCRIPTION 
     The interior camera system according to the present technology is able to focus on selected regions in the vehicle cabin and carry out certain actions in response to information evaluated for those regions. In an ideal arrangement, the sensor system would have fields of view (FOV) capable of covering all interior cabin areas. However, this may not be feasible due to cost, complexity or other constraints. Thus, the cabin can be divided into multiple zones, where the zones may be assigned different coverage priorities. The number of zones that may be employed can depend on the type of vehicle. For instance, a minivan may have more zones than a two-door sports car because it has an additional row of seats and/or additional storage areas. Regardless of the vehicle size or configuration, there are certain threshold requirements to be met or operations to perform when the vehicle is on the way to pick up a passenger, when the passenger is being driven to a destination, and once the passenger exists the vehicle. These and other features are discussed below. 
     Example Vehicle Systems 
       FIG.  1 A  illustrates a perspective view of an example passenger vehicle  100 , such as a minivan, sport utility vehicle (SUV) or other vehicle.  FIG.  1 B  illustrates a top-down view of the passenger vehicle  100 . As shown, the passenger vehicle  100  includes various external sensors for obtaining information about the vehicle&#39;s outside environment, which enable the vehicle to operate in an autonomous driving mode. For instance, a roof-top housing  102  may include a lidar sensor as well as various cameras, radar units, infrared and/ or acoustical sensors. Housing  104 , located at the front end of vehicle  100 , and housings  106   a,    106   b  on the driver&#39;s and passenger&#39;s sides of the vehicle, may each incorporate lidar, radar, camera and&#39;or other sensors, For example, housing  106   a  may be located in front of the driver&#39;s side door along a quarter panel of the vehicle. As shown, the passenger vehicle  100  also includes housings  108   a,    108   b  for radar units, lidar and/or cameras also located towards the rear roof portion of the vehicle. Additional lidar, radar units and/or cameras (not shown) may be located at other places along the vehicle  100 . For instance, arrow  110  indicates that a sensor unit ( 112  in  FIG.  1 B ) may be positioned along the rear of the vehicle  100 , such as on or adjacent to the bumper. And arrow  114  indicates a series of sensor units  116  arranged along a forward-facing direction of the vehicle. In some examples, the passenger vehicle  100  also may include various sensors for obtaining information about the vehicle&#39;s interior spaces (not shown). 
     By way of example. each external sensor unit may include one or more sensors, such as lidar, radar, camera (e.g., optical or infrared), acoustical (e.g., microphone or sonar-type sensor), inertial (e.g., accelerometer, gyroscope, etc.) or other sensors (e.g., positioning sensors such as GPS sensors). While certain aspects of the disclosure may be particularly useful in connection with specific types of vehicles, the vehicle may be any type of vehicle including, but not limited to, cars, trucks, motorcycles, buses, recreational vehicles, etc. 
     There are different degrees of autonomy that may occur for a vehicle operating in a partially or fully autonomous driving mode, The U.S. National Highway Traffic Safety Administration and the Society of Automotive Engineers have identified different levels to indicate how much, or how little, the vehicle controls the driving. For instance, Level  0  has no automation and the driver makes all driving-related decisions. The lowest semi-autonomous mode, Level  1 , includes some drive assistance such as cruise control. Level  2  has partial automation of certain driving operations, while Level  3  involves conditional automation that can enable a person in the driver&#39;s seat to take control as warranted. In contrast, Level  4  is a high automation level where the vehicle is able to drive Puny autonomously without human assistance in. select conditions. And Level  5  is a fully autonomous mode in which the vehicle is able to drive without assistance in all situations. The architectures, components, systems and methods described herein can function in any of the semi or fully-autonomous modes, e.g., Levels  1 - 5 , which are referred to herein as autonomous driving modes. Thus, reference to an autonomous driving mode includes both partial and full autonomy. 
     Turning to  FIG.  2   , this figure illustrates an example view  200  within the cabin of the vehicle  100 , for instance as seen from the front seats. In this view, a dashboard or console area  202  which includes an internal electronic display  204  is visible. Although vehicle  100  includes a steering wheel, gas (acceleration) pedal, or brake (deceleration) pedal which would allow for a semiautonomous or manual driving mode where a passenger would directly control the steering, acceleration and/or deceleration of the vehicle via the drivetrain, these inputs are not necessary for a fully autonomous driving mode. Rather, passenger input may be provided by interaction with the vehicle&#39;s user interface system and/or a wireless network connection for an app on the passenger&#39;s mobile phone or other personal computing device. By way of example, the internal electronic display  204  may include a touch screen or other user input device for entering information by a passenger such as a destination, etc. Alternatively, internal electronic display  204  may merely provide information to the passenger(s) and need not include a touch screen or other interface for user input. 
     Also shown in  FIG.  2    are sensor units  206 ,  208  and  210 , which may be located at different places within the cabin and storage areas. The sensor units may each include one or more cameras (e.g., optical and/or IR imaging devices, high dynamic range (HDR)-capable cameras, etc.), time of flight sensors, IR illuminators, microphones, pressure sensors or other sensors. Information obtained from the sensors can be sent to an onboard computer system for processing and/or analysis in real time to determine, e.g., a state of the vehicle include seating locations for any passengers, whether there are packages or other objects on a seat, on the floor, in a cupholder, etc. The obtained information may be first processed partially or fully by the sensor unit, or raw or partially processed data may be sent to the onboard computer system. For instance, an HDR camera captures multiple images having different exposure levels at the same time (e.g., 2-4 images). The camera sensor unit may pre-process the images to obtain a single image that is then sent to the computer system for further image processing. Based on this information the vehicle may take certain actions or communicate with a remote system that can schedule a service or provide assistance. By way of example, a neural network evaluating the camera images may determine whether the camera requires cleaning or if there is an obstruction of the camera. In the first situation, the computer system may actuate a cleaning element such as a wiper to clean the camera lens. In the second situation, a service call may be required to correct the obstruction. 
       FIG.  3    illustrates a block diagram  300  with various components and systems of an exemplary vehicle, such as passenger vehicle  100 , to operate in an autonomous driving mode. As shown, the block diagram  300  includes one or more computing devices  302 , such as computing devices containing one or more processors  304 , memory  306  and other components typically present in general purpose computing devices. The memory  306  stores information accessible by the one or more processors  304 , including instructions  308  and data  310  that may be executed or otherwise used by the processor(s)  304 . The computing system may control overall operation of the vehicle when operating in an autonomous driving mode. 
     The memory  306  stores information accessible by the processors  304 , including instructions  308  and data  310  that may be executed or otherwise used by the processors  304 . The memory  306  may be of any type capable of storing information accessible by the processor, including a computing device-readable medium. The memory is a non-transitory medium such as a hard-drive, memory card, optical disk, solid-state, etc. Systems may include different combinations, of the foregoing, whereby different portions of the instructions and data are stored on different types of media. 
     The instructions  308  may be any set of instructions to he executed directly (such, as machine code) or indirectly (such as scripts) by the processor(s). For example, the instructions may be stored as computing device code on the computing device-readable medium. In that regard, the terms “instructions”, “modules” and “programs” may be used interchangeably herein. The instructions may be stored in object code format for direct processing by the processor, or in any other computing device language including scripts or collections of independent source code modules that are interpreted on demand or compiled in advance. The data  310  may be retrieved, stored or modified by one or more processors  304  in accordance pith the instructions  308 . In one example, some or all of the memory  306  may be an event data recorder or other secure data storage system configured to store vehicle diagnostics and/or obtained sensor data, which may be on board the vehicle or remote, depending on the implementation. The data may include, for instance, inspection or operating checklists or other use cases that can be used pre-ride, in-ride and or post-ride. The data may also include train sets, object models or other information to perform object recognition for different types of objects (e.g., passengers, pets or service animals, bags or other packages, mobile phones or other personal computer devices, etc.) 
     The processors  304  may be any conventional processors, such as commercially available CPUs. Alternatively, each processor may be a dedicated device such as an ASIC or other hardware-based processor. Although  FIG.  3    functionally illustrates the processors, memory, and other elements of computing devices  302  as being within the same block, such devices may actually include multiple processors, computing devices, or memories that may or may not be stored within the same physical housing, Similarly, the memory  306  may he a hard drive or other storage media located in a housing different from that of the processor(s)  304 . Accordingly, references to a processor or computing device will, be understood to include references to a collection of processors or computing devices or memories that may or may not operate in parallel. 
     In one example, the computing devices  302  may form an autonomous driving computing system incorporated into vehicle  100 . The autonomous driving computing system is configured to communicate with various components of the vehicle. For example, the computing devices  302  may be in communication with various systems of the vehicle, including a driving system including a deceleration system  312  (for controlling braking of the vehicle), acceleration system  314  (for controlling acceleration of the vehicle), steering system  316  (for controlling the orientation of the wheels and direction of the vehicle), signaling system  318  (for controlling turn signals), navigation system  320  (for navigating the vehicle to a location or around objects) and a positioning system  322  (for determining the position of the vehicle, including the vehicle&#39;s pose). The autonomous driving computing system may employ a planner module  324 , in accordance with the navigation system  320 , the positioning system  322  and/or other components of the system, e.g., for determining a route from a starting point to a destination or for making modifications to various driving aspects in view of current or expected traction conditions. 
     The computing devices  302  are also operatively coupled to a perception system  326  (for detecting objects in the vehicle&#39;s internal and external environments), a power system  328  (for example, a battery and or gas or diesel powered engine) and a transmission system  332  in order to control the movement, speed, etc., of the vehicle in accordance with the instructions  308  of memory  306  in an autonomous driving mode which does not require or need continuous or periodic input from a passenger of the vehicle. Some or all of the wheels/tires  330  are coupled to the transmission system  332 , and the computing devices  32  may be able to receive information about tire pressure, balance and other factors that may impact driving in an autonomous mode. 
     The computing devices  302  may control the direction and speed of the vehicle, e,g., via the planner module  324 , by controlling various components. By way of example, computing devices  302  may navigate the vehicle to a destination location completely autonomously using data from the map information and navigation system  320 . Computing devices  302  may use the positioning system  322  to determine the vehicle&#39;s location and the perception system  326  to detect and respond to objects when needed to reach the location safely. In order to do so, computing devices  302  may cause the vehicle to accelerate (e.g., by increasing fuel or other energy provided to the engine by acceleration system  314 ), decelerate (e.g., by decreasing the fuel supplied to the engine, changing gears, and/or by applying brakes by deceleration system  312 ), change direction (e.g., by turning the front or other wheels of vehicle  100  by steering system  316 ), and signal such changes (e.g., by lighting turn signals of signaling system  318 ), Thus, the acceleration system  314  and deceleration system  312  may be a part of a drivetrain or other type of transmission system  332  that includes various components between an engine of the vehicle and the wheels of the vehicle. Again, by controlling these systems, computing devices  302  may also control the transmission system  332  of the vehicle in order to maneuver the vehicle autonomously. 
     Navigation system  320  may be used by computing devices  302  in order to determine and follow a route to a location. In this regard, the navigation system  320  and/or memory  306  may store map information, e.g., highly detailed maps that computing devices  302  can use to navigate or control the vehicle. As an example, these maps may identify the shape and elevation of roadways, lane markers, intersections, crosswalks, speed limits, traffic signal lights, buildings, signs, real time traffic information, vegetation, or other such objects and information. The lane markers may include features such as solid or broken double or single lane lines, solid or broken lane lines, reflectors, etc. A given lane be associated with left and/or right lane lines or other lane markers that define the boundary of the lane. Thus, most lanes may be bounded by a left edge of one lane line and a right edge of another lane line. 
     By way of example only, the perception system  326  may include one or more light detection and ranging (lidar) sensors, radar units, cameras (e.g., optical and/or IR imaging devices, with or without a neutral-density filter (ND) filter), positioning sensors (e.g., gyroscopes, accelerometers and/or other inertial components), acoustical sensors (e.g., microphones or sonar transducers), and/or any other detection devices. In addition, IR illuminators may also be employed in conjunction with the cameras, for instance to illuminate within the cabin or immediately adjacent to the vehicle. Such sensors of the perception system  326  may detect objects outside of the vehicle and their characteristics such as location, orientation, size, shape, type (for instance, vehicle, pedestrian, bicyclist, etc.), heading, speed of movement relative to the vehicle, etc. To aid in the detection and classification of objects, one or more illuminators may have a combination of IR and visible light to obtain certain color information. Thus, the illuminator may be configured to also emit light in at least part of the visible light spectrum. 
     As shown in  FIG.  3   , the perception system  326  includes one or more external sensors  334  for detecting objects external to the vehicle. The sensors  334  are located in one or more sensor units around the vehicle. The detected objects may be other vehicles, obstacles in the roadway, traffic signals, signs, trees, bicyclists, pedestrians, etc. The sensors  334  may also detect certain aspects of weather or other environmental conditions, such as snow, rain or water spray, or puddles, ice or other materials on the roadway. 
     The perception system  326  also includes other sensors  336  within the vehicle to detect objects and conditions within the vehicle, such as in the passenger compartment and trunk region. For instance, such sensors may detect, e.g.. one or more persons, pets, packages, etc., as well as conditions within and tor outside the vehicle such as temperature, humidity, etc. This can include detecting where the passenger(s) is sitting within the vehicle (e.g., front passenger seat versus second or third row seat, left side of the vehicle versus the right side, etc.). The interior sensors  336  may detect the proximity, position and/or line of sight of the passengers in relation to one or more display devices of the passenger compartment, for example to determine how best to present information to the passengers during a ride, 
     The raw data obtained by the sensors can be processed by the perception system  336  and/or sent for further processing to the computing devices  302  periodically or continuously as the data is generated by the perception system  336 . Computing devices  302  may use the positioning system  322  to determine the vehicle&#39;s location and perception system  326  to detect and respond to objects when needed to reach the location safely, e.g., via adjustments made by planner module  324 . In addition, the computing devices  302  may perform calibration of individual sensors, all sensors in a particular sensor assembly, or between sensors in different sensor assemblies or other physical housings. 
     As illustrated in  FIGS.  1 A-B  and  2 , certain sensors of the perception system  326  may be incorporated into one or more sensor assemblies or housings outside and inside the vehicle. In one example, these may be integrated into the side-view mirrors on the vehicle. In another example, other sensors may be part of the roof-top housing  102 , or other sensor housings or units  106   a,b,    108   a,b,    112  and/or  116 . In further examples, cameras and IR illuminators may be disposed within the vehicle along the headliner, the A, B, C or D pillars, etc. The computing devices  302  may communicate with the sensor assemblies located on or otherwise distributed along the vehicle. Each assembly may have one or more types of sensors such as those described above. 
     Returning to  FIG.  3   , computing devices  302  may include all of the components normally used in connection with a computing device such as the processor and memory described above as well as a user interface subsystem  338 . The user interface subsystem  338  may include one or more user inputs  340  (e.g., a mouse, keyboard, touch screen and/or microphone) and one or more display devices  342  (e.g., a monitor having a screen or any other electrical device that is operable to display information). In this regard, an internal electronic display may be located within a cabin of the vehicle (e.g.,  204  in  FIG.  2   ) and may be used by computing devices  302  to provide information to passengers within the vehicle. By way of example, displays may be located, e.g., along the dashboard, on the rear of the front row of seats, on a center console between the front row seats, along the doors of the vehicle, extending from an armrest, etc. Other output devices, such as speaker(s)  344  may also be located within the passenger vehicle. The passenger(s) may communication directly with the vehicle via one or more device inputs  346 . The inputs  346  may include a touch screen on an internal electronic display, a microphone for receiving spoken instructions, a haptic sensor for receiving physical feedback, etc. 
     The vehicle also includes a communication system  348 . For instance, the communication system  348  may also include one or more wireless configurations to facilitate communication with other computing devices, such as passenger computing devices within the vehicle, computing devices external to the vehicle such as in another nearby vehicle on the roadway, and/or a remote server system The network connections may include short range communication protocols such as Bluetooth™, Bluetooth™ low energy (LE), cellular connections, as well as various configurations and protocols including the Internet, World Wide Web, intranets, virtual private networks, wide area networks, local networks, private networks using communication protocols proprietary to one or more companies, Ethernet, WiFi and HTTP, and various combinations of the foregoing. The communication system  348  may thus include one or more antennas located within the cabin and/or on the vehicle&#39;s roof, as well as one or more transceiver modules coupled to the antennas for providing wireless communication. 
     While the components and systems of  FIG.  3    are generally described in relation to a passenger vehicle arrangement, as noted above the technology may be employed with other types of vehicles, such as buses, campers, cargo vehicles, etc. In larger vehicles, the user interface elements such as displays, microphones and speakers may be distributed so that each passenger has his or her own information presentation unit and/or one or more common units that can present status information to larger groups of passengers. Similarly, the interior sensors  336  of the perception system  326  may be arranged (e.g., based on one or more coverage priorities) to have fields of view encompassing different areas throughout the vehicle. 
     EXAMPLE IMPLEMENTATIONS 
     In view of the structures and configurations described above and illustrated in the figures, various aspects will now be described in accordance with aspects of the technology. 
     A self-driving vehicle, such as a vehicle with level  4  or level  5  autonomy that can perform driving actions without human operation, has unique requirements and capabilities. This includes making driving decisions based on a planned route, received traffic information, and objects in the external environment detected by the onboard sensors. It also includes determining a status of the vehicle before picking up a passenger, while transporting the passenger to his or her destination, and after the passenger exists the vehicle. hi such situations, in order to determine the vehicle status and operate accordingly, the vehicle may rely on sensor data obtained from interior sensors distributed throughout the vehicle, such as in the passenger compartment and trunk. 
       FIG.  4 A  illustrates a top-down view  400  of a vehicle cabin of an example vehicle, such as vehicle  100  of  FIG.  1   . As shown, the cabin includes a front seat area  402  and a rear seat area  404 . A center console  406  may be disposed between the front seats.  FIG.  4 B  illustrates a perspective view  410  of a trunk region or other cargo space  412  of the vehicle. As noted above, ideally the interior sensor system may have sensors with fields of view that encompass all areas within the vehicle. However, this may not be feasible due to the number of sensors that would be required, as well as the cost of deploying and servicing such sensors. Thus, according to one aspect of the technology, the interior sensor system employs multiple priority levels to cover different regions of the vehicle. 
     By way of example, there may be three priority levels generally categorized as follows: high priority, medium priority, and low priority. In this example, high priority areas may encompass, e.g., all seat surface (including both lower and upper surfaces), the center console area, the trunk floor surface, and areas adjacent to the trunk such as where a person or their legs would be when leaning into the trunk, The medium priority areas may encompass front and rear floor surfaces. And low priority areas may include storage locations, such as in-door receptacles, seatback compartments, etc. Other scenarios may have two, four or more priority levels. 
     The priority level for a given area may he used to select the refresh rate and/or resolution of the imagery obtained for that area. By way of example only, a high priority area may have a refresh rate on the order of 0.5-5.0 seconds at a maximum resolution of the imaging device, while a low priority area may have a refresh rate on the order of 30-60 seconds at a lower resolution (e.g., 25-50% of the maximum resolution). A medium priority area may have a refresh rate on the order of 3.0-45 seconds at a medium resolution (e.g., 70-80% of the maximum resolution). These refresh and resolution rates are merely exemplary, and may be lower or higher. In additional or alternatively, the image processing techniques used for the imagery may he tailored to the priority level, region of the vehicle, or other criteria. For instance, for seat areas, the image processing may use training data or other machine learning approaches (e.g., a neural network) that are primarily focused on recognizing people, whereas for storage areas the system may be more tuned to detecting the type of object (e.g., a package, groceries, etc.). There may be different precision recall requirements for different priorities, thereby optimizing compute for the on-board processing system. Alternatively or additionally, based on the different priorities the system could also trigger a request to a remote a customer service group. For instance, if the priority level meets or exceeds a certain threshold, or when there is uncertainty about the image (e.g., on-board processing cannot determine if there is a left item or a mess, or if there is an occupant), the request for remote assistance may be sent. This can include the remote system performing additional object recognition processing on the image of interest or having a remote assistance technician review the image. 
       FIGS.  5 A-F  illustrate different regions of the vehicle cabin and trunk for an exemplary vehicle, such as vehicle  100 . Continuing the above example, the regions are shown with three different priority levels for sensor detection. In particular,  FIG.  5 A  presents a first view  500  of the rear seats of the vehicle and  FIG.  5 B  presents a second view  510  of the rear seats. As shown, there are three types of areas, namely areas  502  in dotted lines, areas  504  in dashed lines, and areas  506  in dash-dot lines. A console  508  is also shown between the two rear seats. In this example, areas  502  are high priority, areas  504  are medium priority, and areas  506  are low priority. 
       FIG.  5 C  presents a view  520  of the backs of the front seats of a vehicle. Here, areas  506  on the backs of the front seats are shown in dash-dot lines. Also shown is a console  522 , which is positioned between the front seats. In various embodiments one or both consoles  508  and  522  may be within, the vehicle or not included at all.  FIG.  5 D  presents a first view  530  of the front seat section of the cabin, facing the seats.  FIG.  5 E  presents a second view  540  of the front seat section from the viewpoint of the passenger(s) facing the front of the vehicle. And  FIG.  5 F  presents a view  550  of a trunk or other storage area of the vehicle (e.g., when the rear seats are folded down). Here, there may be a main cargo area encompassed by dash-dot region  504 , and an entrance area encompassed by dashed region  502 . The entrance area may be, e.g., where a passenger or other person leans in to place a package in the main cargo area. Coverage of this area may be very important, for instance when the vehicle determines whether to close the trunk. 
     Visual information detected in each area may be analyzed via an on-board (or remote) processing system for each of the regions. This may be done, for instance, using machine learning techniques to identify if a portion of the cabin differs from a baseline (“clean”) configuration. However, the ability to identify such differences may depend on the quality of the data, including sensor resolution. By way of example, one constraint for an optical camera having resolution on the order of 1-4 megapixels (MP) is the ability to detect a matte black object of a predetermined size. For instance, the object may be between 70×40×0.5 mm and 110×90×20 mm. While a higher resolution imager may be able to satisfactorily detect an object smaller than the above examples, this may require an increased amount of onboard processing power and/or data storage, Other constraints may be a low light signal to noise ratio (SNR) of between 5:1 and 15:1 (or more or less), and a stray light rejection ratio on the order of 0.8× −4  to 1.5× 4 , for instance with a maximum source radius of no more than ≤6.0°. The higher the stray light rejection ratio, the better the system is able to handle sources of light that could degrade the image quality, fore instance due to image flare. This could come from dashboard or window reflections, or from a user device (e.g., cellphone flash turned on, etc.) The radius of the source represents how much space the stray light source is taking in the image. 
     The different regions and/or different, priority levels of the cabin and storage areas can he covered by a set of cameras distributed at various locations.  FIG.  2    illustrated one example where cameras and other sensors  206 ,  208  and/or  210  may be located. In other examples, cameras and IR illuminators (and microphones) may be positioned in other areas of the interior, such as along a pillar (such as an A, B, C or D pillar), in the console, in or adjacent to a door, in a headrest or armrest, etc. Regardless of the exact position, the sensors should he arranged to provide fields of view sufficient to cover the selected areas or zones that are of interest (e.g., the seats, floor, storage places). For example, narrower FOV cameras may be disposed in more places in the vehicle or larger FOV in fewer places. In many scenarios, at least one camera is positioned per raw of seating and one camera for the trunk or other cargo space. For vehicles with an aisle, a pair of cameras may be positioned on each side of the aisle per row. Microphones can be positioned to capture in-vehicle audio. This may be used, for instance, to assist the processing system when evaluating captured imagery. Regardless of the placement of the cameras (and microphones), the components need to meet any applicable safety standards, including FMVSS 201U (Occupant Protection in Interior Impact). 
     In one scenario, there is a least one, camera arranged to view the front seat areas, and at least one camera arranged to view the rear seat areas. Additional cameras may be arranged to provide sufficient coverage of the various cabin zones in view of the priority levels as noted above. By way of example, the optical cameras may he fisheye lens-type cameras with IR illumination, For instance, the IR illumination may be on the order of 800 to 1000 nm. 
     According to one aspect, the IR illumination is able to cover the same field of view as some or all of the cameras. In some examples, IR illuminators are collocated with respective cameras, And in other examples, the illumination devices are not collocated with the Cameras. However, one constraint is that the IR illuminator(s) be placed so that the illumination does not degrade the image quality (due to flare). For instance, the IR illuminator(s) may be under the same constraint as for stray light rejection. 
     In some situations IR illumination can affect color accuracy. This could potentially affect the ability to correctly recognize a detected object in an image. Thus, in one aspect the cameras may be calibrated to maximize the color accuracy. The IR illumination for in-cabin cameras may be activated based on ambient light conditions within the main cabin, whether the vehicle&#39;s headlights are on, and/or other criteria. For a camera(s) viewing the trunk area, there may be no IR. illumination, IR illumination triggered according to ambient light conditions in the trunk, or IR illumination only during a pre- or post-ride vehicle check. 
     Pre- and/or post-ride vehicle cheeks may be performed for the cabin area and/or the trunk using the various cameras and illuminators. Additional checks may be performed during a ride (e.g., “mid-ride” checks). How such mid-ride checks are performed may depend on time of day, driving conditions, vehicle configurations and/or other factors, For example, at night or other low-ambient light situations, interior visible cabin lights should not be turned on to perform a check, since this can be distracting to the passenger(s) and could also degrade the imagery taken by the camera(s). Whether the vehicle has a solid roof, a moon roof or a sunroof may also affect the imaging approach. In one example, the exposure time for a given check may be on the order of 50-50 ms (e.g., 100 ms) or more or less. An auto exposure algorithm may be used to define the gain and exposure time for each camera. This will account for the amount of ambient light and potential flaring from stray light sources. 
     The interior sensors may be employed in various use situations, which generally fall into pre-ride situations, post-ride situations, and mid-ride while transporting one or more passengers to their destination(s). 
     Imagery from the cameras (and potentially audio from the microphones) may be communicated to the on-board vehicle control system via a wired link (e.g., power over data line) or a wireless link. Then the system may perform real-time object recognition, for instance via machine learning techniques, to identify different conditions or situations, such as a passenger being improperly buckled, an object has been inadvertently left in the vehicle, cleaning is required, whether certain areas are clear (e.g., so that the trunk door can be closed or a window rolled up), and whether someone in the driver&#39;s seat has their hands on the steering wheel. Alternatively or additionally, certain imagery may be sent to a remote assistance service for processing. For example, the remote assistance service may have more processing resources or a more robust machine learning image processing technique that can identify specific items or other objects in the vehicle. 
     By way of example, in a pre-ride situation, the control system may confirm that the cabin is clean for the next rider and/or confirm the cabin is in a starting state condition (e.g. seats are in a nominal position). If the cabin is not clear, the control system may contact a service center to schedule a cleaning before the next pickup. If that is not possible, prospective passengers may be alerted, ride fees may be adjusted, etc. If the seats are not in the starting state condition, then the control system may cause one or more actuators or other seat assemblies to adjust the seats accordingly, for instance by moving a seat forward or backward, adjusting the recline angle, headrest height, etc. Similar adjustments may be made for window or steering wheel positioning, etc. Alternatively or additionally, such adjustment may be performed based on user preferences of, the passenger(s) to be picked up next.  FIGS.  6 A-B  illustrate one example of seat adjustment. As shown in  FIG.  6 A , the headrest of the front passenger seat may be fully extended from a prior rider. The control system may lower the headrest to a default height before the next pickup, as shown in  FIG.  6 B . 
     During a ride (e.g., “mid-ride”), as the vehicle is operating in an autonomous driving mode, the control system may confirm that riders are properly seated and belted, confirm the number of riders based on the trip request, determine seats used, and/or observe rider behavior such as in response to certain driving operations, etc. By way of example,  FIG.  7 A  illustrates a view  700 . Based on obtained imagery, the control system may determine that there are two passengers  702 a,  702 h in the front seats, and that the seatbelts  704   a,    704   b  are properly buckled. The system may also determine current seat configurations  706   a,    706   b,  for instance to compare against the default seat positions pre-ride. And as shown in  710  of  FIG.  7 B , the system may determine whether there are any packages  712  or other objects  714  located in the cabin (or the trunk). This information can be used in the post-ride phase, for example to check that riders have exited the vehicle, check that the vehicle was left in a clean condition, and to check for items left behind. At the ride&#39;s conclusion, the onboard system may remind passengers to take all their belongings with them. However, should something be left behind, the post-ride check identifies it. At this point, the vehicle may send a message to the user&#39;s device regarding the left item. The message may indicate when and where the item may be retrieved. Alternatively or additionally, the vehicle may correspond with a remote assistance service to notify it about the left item. This can include scheduling a stop at a service facility or other location so that the item may be removed from the vehicle and stored until the user can retrieve it. Should the post-ride check indicate that the vehicle needs cleaning or other service (e.g., if the windows or headrests cannot be returned to a default position), the vehicle may schedule a service or otherwise adjust its planned route accordingly. Furthermore, the cameras may also be used to determine user sentiment or for other user experience research. This can include using the cameras to learn what seats are most preferred by passengers for a given vehicle or seating configuration. This information may be employed when selecting and dispatching vehicles for rider pickups, to adjust camera placement and FOV, etc. 
     i As explained above, the vehicle may communicate directly with the passengers via its user interface system, or indirectly via its communication system. In the latter case, information may be communicated to or received from an app on the customer&#39;s mobile phone or other computing device. Such communication by the vehicle be done during the ride, as well as pre- and/or post-ride. 
       FIGS.  8 A-B  illustrate general examples of how information may be communicated between the vehicle and the user. 
     In particular,  FIGS.  8 A and  8 B  are pictorial and functional diagrams, respectively, of an example system  800  that includes a plurality of computing devices  802 ,  804   806 ,  808  and a storage system  810  connected via a network  812 . System  800  also includes vehicles  814 , which may be configured the same as or similarly to vehicles  100  of  FIGS.  1 A-B , Vehicles  814  may he part of a fleet of vehicles, Although only a few vehicles and computing devices are depicted for simplicity, a typical system may include significantly more. 
     As shown in view  850  of  FIG.  8 B , each of computing devices  802 ,  804 ,  806  and  808  may include one or more processors, memory, data and instructions. Such processors, memories, data and instructions may be configured similarly to the ones described above with regard to  FIG.  3   . The various computing devices and vehicles may communication via one or more networks, such as network  812 . The network  812 , and intervening nodes, may include various configurations and protocols including short range communication protocols such as Bluetooth™, Bluetooth LE™, the Internet, World Wide Web, intranets, virtual private networks, wide area networks, local networks, private networks using communication protocols proprietary to one or more companies. Ethernet, WiFi and HTTP, and various combinations of the foregoing. Such communication may be facilitated by any device capable of transmitting data to and from other computing devices, such as modems and wireless interfaces. 
     In one example, computing device  802  may include one or more server computing devices having a plurality of computing devices, e.g., a load balanced server farm, that exchange information with different nodes of a network for the purpose of receiving, processing and transmitting the data to and from other computing devices. For instance, computing device  802  may include one or more server computing devices that are capable of communicating with the computing devices of vehicles  814 , as well as computing devices  804 .  806  and  808  via the network  812 . For example, vehicles  814  may be a part of a fleet of vehicles that can be dispatched by a server computing device to various locations. In this regard, the computing device  802  may function as a dispatching server computing system which can be used to dispatch vehicles to different locations in order to pick up and drop off passengers or to pick up and deliver cargo. In addition, server computing device  802  may use network  812  to transmit and present information to a user of one of the other computing devices or a passenger of a vehicle. In this regard, computing devices  804 ,  806  and  808  may be considered client computing devices. 
     As shown in  FIG.  8 A  each client computing device  804 ,  806  and  808  may be a personal computing device intended for use by a respective user  816 , and have all of the components normally used in connection with a personal computing device including a one or more processors (e.g., a central processing unit (CPU)), memory (e.g., RAM and internal hard drives) storing data and instructions, a display (e.g., a monitor having a screen, a touch-screen, a projector, a television, or other device such as a smart watch display that is operable to display information), and user input devices (e.g., a mouse, keyboard, touchscreen or microphone). The client computing devices may also include a camera for recording video streams, speakers, a network interface device, and all of the components used for connecting these elements to one another. As indicated in Fig. sa device  808  may be the device of a passenger who is currently in the vehicle, while device  806  may be the device of a rider awaiting pickup. 
     Although the client computing devices may each comprise a full-sized personal computing device, they may alternatively comprise mobile computing devices capable of wirelessly exchanging data with a server over a network such as the Internet. By way of example only, client computing devices  806  and  808  may be mobile phones or devices such as a wireless-enabled PDA, a tablet PC, a wearable computing device (e.g., a smartwatch), or a netbook that is capable of obtaining information via the Internet or other networks. 
     In some examples, client computing device  804  may be a remote assistance workstation used by an administrator or operator to communicate with passengers of dispatched vehicles, or users awaiting pickup. Although only a single remote assistance workstation  804  is shown in  FIGS.  8 A-B , any number of such workstations may be included in a given system. Moreover, although workstation  804  is depicted as a. desktop-type computer, the workstation  804  may include various types of personal computing devices such as laptops, netbooks, tablet computers, etc. 
     Storage system  810  can be of any type of computerized storage capable of storing information accessible by the server computing devices  802 , such as a hard-drive, memory card, ROM, RAM, DVD, CD-ROM, flash drive and/or tape drive. In addition, storage system  810  may include a distributed storage system where data is stored on a plurality of different storage devices which may be physically located at the same or different geographic locations. Storage system  810  may be connected to the computing devices via the network  812  as shown in  FIGS.  8 A-B , and/or may be directly connected to or incorporated into any of the computing devices. The remote assistance service or the server computing device may be used to provide enhanced image processing. For example, they may have more robust machine learning models than the onboard system, which can detect and categorize (classify) more types of objects. Based on this categorization, the system may tailor the message to the passenger or other user about the item (e.g., audible announcement that the user&#39;s cell phone has fallen under the seat, or a message sent to an app on the user&#39;s device that a package has been left in the trunk and can be picked up at a service center). 
     The vehicle or remote assistance may communicate directly or indirectly with the passengers&#39; client computing devices. Here, for example, information may be provided to the passengers regarding current driving operations, changes to the route in response to the situation, whether to buckle up. caution about packages or other objects left in the vehicle, etc. 
       FIG.  9    illustrates a method of operation in accordance with the foregoing. In particular, it illustrates a flow diagram  900  of a method of controlling an interior sensing system for a vehicle configured to operate in an autonomous driving mode. At block  902 , one or more processors initiate image capture by the plurality of image sensors in accordance with a predetermined ride checklist. The predetermined ride checklist is stored in memory of a control system of the vehicle. At block  904 , in response to the predetermined ride checklist, the one or more processors receive captured imagery from a plurality of image sensors disposed along different surfaces within an interior area of the vehicle. The plurality of image sensors is configured to capture images of the interior area, of the vehicle. At block  906 , the one or more processors perform processing of the received imagery to detect a current status of the interior area of the vehicle based on detected objects or conditions within the vehicle. And at block  908 , the one or more processors cause one or more systems of the vehicle to perform an action based on the current status of the interior area of the vehicle. 
     Finally, as noted above, the technology is applicable for various types of vehicles, including passenger cars, buses, RVs and trucks or other cargo carrying vehicles. 
     Unless otherwise stated, the foregoing alternative examples are not mutually exclusive, but may be implemented in various combinations to achieve unique advantages. As these and other variations and combinations of the features discussed above can be utilized without departing from the subject matter defined by the claims, the foregoing description of the embodiments should be taken by way of illustration rather than by way of limitation of the subject matter defined by the claims. In addition, the provision of the examples described herein, as well as clauses phrased as “such as,” “including” and the like, should not be interpreted as limiting the subject matter of the claims to the specific examples; rather, the examples are intended to illustrate only one of many possible embodiments. Further, the same reference numbers in different drawings can identify the same or similar elements. The processes or other operations may be performed in a different order or simultaneously, unless expressly indicated otherwise herein.