Abstract:
A vehicular vision system includes at least three cameras disposed at the vehicle and having respective fields of view exterior of the vehicle and operable to capture image data. Image data received at a video processor module is processed by a video processor of the video processor module. The received image data is processed by the video processor to generate a synthesized image. The synthesized image is output from the video processor module for display by a single display screen of a display device that is viewable by a driver of the equipped vehicle when normally operating the vehicle. The video processor may be operable for least one of (i) object tracking, (ii) object classification, (iii) diagnostics, (iv) camera selection, (v) camera control, (vi) on-screen display generation, (vii) data storage and (viii) data exchange.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 12/708,079, filed Feb. 18, 2010, now U.S. Pat. No. 8,405,725, which is a continuation of U.S. patent application Ser. No. 10/209,181, filed Jul. 31, 2002, now U.S. Pat. No. 7,697,027, which claims priority from U.S. provisional patent application Ser. No. 60/309,023, filed on Jul. 31, 2001, the disclosure of which is hereby incorporated herein by reference in its entirety. 
    
    
     FIELD OF THE INVENTION 
     This invention is directed to a video processor made for a vehicular video system and, more particularly, to a single electronic module which processes images from multiple image capture devices, such as CMOS video cameras, mounted throughout the interior and/or exterior of a vehicle, such as an automobile. 
     BACKGROUND THE INVENTION 
     It is known to use multiple video cameras on a vehicle to capture images both interior to the vehicle and exterior to the vehicle. It is also known to process the image outputs of such cameras by a variety of controls in order to display said images to a driver or another occupant of the vehicle, or to utilize the output of a camera in order to generate a control signal for a vehicular accessory, such as a headlamp or windshield wiper. As the number and complexity of camera-based accessories and features grows in a vehicle, there is a need to economically and efficiently process the multiple outputs from a plurality of camera and other sensors in order to perform a plurality of image displays and control functions. 
     SUMMARY OF THE INVENTION 
     The present invention is directed to a Video Processor Module (VPM) that is adapted to accept input from several vehicular cameras and optionally from other non-video devices and sensors in or on the vehicle and to process the image outputs therefrom in order to provide a variety of functions and controls. The VPM is preferably further adapted to interface with other vehicle modules via interfaces to the vehicle communication buses, such as via a CAN bus and/or a LIN bus. 
     A vehicle-based video processor module for a video system of a vehicle, according to an aspect of the invention, includes a video processor circuit, a plurality of electronic sensor interfaces that are operable to receive image output data from a plurality of imaging devices and at least one electronic vehicle interface that is operable to communicate with a vehicle communication bus. The video processor circuit is operable to process the image output data from the plurality of imaging devices into a single database in a standard format. 
     A vehicle-based video processor module for a video system of a vehicle, according to an aspect of the invention, includes a video processor circuit, a plurality of electronic sensor interfaces that are operable to receive image output data from a plurality of imaging devices and at least one electronic vehicle interface that is operable to communicate with a vehicle communication bus. The video processor circuit is operable to process the image output data from the plurality of imaging devices and to enhance the image output data. 
     These and other objects, advantages and features of this invention will become apparent upon review of the following specification in conjunction with the drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a top plan view of a vehicle outfitted with a vehicular video system, according to the invention; and 
         FIG. 2  is a block diagram of a video processor module, according to the invention. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring now to the drawings and the illustrative embodiments depicted therein, a vehicle  10  is illustrated in  FIG. 1  having a vehicular video system  12 , according to the invention. Vehicular video system  12  includes video processor module (VPM)  14 , which receives input from a plurality of sensors, generally shown at  16 . VPM  14  processes the output data from the plurality of devices and enhances the image output data. Sensors  16  may be imaging devices, such as vehicular cameras, as well as non-imaging devices. An example of a mix of sensors  16  that may be used in vehicular video system  12  includes imaging sensors, forward-facing imaging sensors, rearward-facing imaging sensors, left-side-facing imaging sensors, right-side-imaging sensors, inward-facing cabin-imaging sensors, and the like. Non-video sensors may include a near infrared sensor, a far infrared sensor, a radar sensor such as a Doppler radar sensor, a sonar sensor, a thermal sensor, a night vision sensor such as a multi-pixel bolometer and any other sensors which establish the presence, distance to, position and/or speed of an object. A Doppler radar sensor or side-facing camera may be mounted at an exterior mirror assembly. A forward-facing camera may be mounted at an interior mirror assembly of the vehicle that performs a headlamp control and/or windshield wiper control function. A side lane blind spot and/or lane change system may be provided and the VPM may be adapted to accept data from a variety of other non-video sensors to enhance performance in all visibility situations, such as when driving in fog or other low visibility conditions. 
     Video processor module  14  includes a video processor circuit  18  and a plurality of electronic sensor interfaces  20  for receiving data from a plurality of sensors  16 . In the embodiment illustrated in  FIG. 2 , electronic interfaces  20  are illustrated as receiving image data output respectively from right-hand-facing and left-hand-facing side cameras, a front-facing camera and a rear-facing camera. The image data may be transmitted across a robust transmission means, such as a fiber-optic cable or a high-density wireless link, or the like. However, electronic interfaces  20  are capable of receiving data from non-imaging sensors as well. Electronic interfaces  20  may be utilized, J1394 Firewire protocol, NTSC protocol, or other standard protocol. Video processor module  14  includes at least one electronic vehicle interface  22  which is operative to interface with a vehicle bus, such as a CAN bus, a LIN bus, or the like. 
     Video processor circuit  18  includes a core  26  to exchange data with electronic sensor interfaces  20 , and a core  28  to exchange data with electronic vehicle interfaces  22 . A memory device  24  stores various data such as settings. Video processor circuit  18  includes a camera selection and advanced camera control section  30  for controlling the individual sensor devices and for integrating data from the plurality of sensors, such as by fusing or combining image data from multiple imaging sensors and data from non-imaging sensors. This combined or fused data is preprocessed into a single database in a standard format. Video processor circuit  18  further includes an object-tracking section  32  for tracking objects that are identified and classified by an object classification section  34 . Video processor circuit  18  further includes a display section  36  which generates on-screen display signals and a diagnostic section  35  for performing diagnostics. 
     Having described the components of vehicular video system  12  and their operation, examples of various functions that can be supported with this vehicular video system will be set forth. One set of functions includes features for viewing of a displayed image. Video processor module  14  may be capable of merging of images from a plurality of imaging sensors  16  to provide a panoramic view, which exceeds the field of view of a single camera or allows the image to “wrap” around the vehicle. Video processor module  14  may be further capable of electronic elimination of distortions created by wide-angle lenses used with sensors  16 . Video processor module  14  may be capable of superimposing graphics onto a displayed image to provide additional information to the observer. 
     Another set of functions includes features for sensing using an electronic image. Video processor module  14  may be programmed to be capable of detection with object position, speed and classification to support one or more of the following features:
         Blind spot detection   Lane change aid   Adaptive speed control   Reverse aid warning   Advanced crash warning
 
Video processor module  14  may be programmed to be capable of detecting the location of a lane on a road in conjunction with an imaging sensor  16 . This capability can support a lane departure-warning feature or autonomous vehicle control. Video processor module  14  may use imaging sensors to establish ambient lighting and detect other vehicles for automatic control of the headlamps (on/off) and high/low beams. Video processor module  14  may have the capability to use imaging sensors to establish ambient lighting and vehicle headlamps for automatic control of electrochromic mirrors. Video processor module  14  may have the capability to detect the presence, position and size of occupants inside the vehicle. Video processor module  14  may have the capability to stabilize an image for viewing or use in sensing algorithms. It should be understood that the listed features and functions are illustrative only. Which of the particular ones that are used for a particular vehicular application may differ from those used for other vehicular applications. Additionally, other features and functions may be identified for video processor module  14  by the skilled artisan.
       

     VPM  14  can be utilized in a variety of applications such as disclosed in commonly assigned U.S. Pat. Nos. 5,670,935; 5,949,331; 6,222,447; 6,201,642; 6,097,023; 5,715,093; 5,796,094; and 5,877,897 and commonly assigned patent application Ser. No. 09/793,002 filed Feb. 26, 2001, now U.S. Pat. No. 6,690,268, Ser. No. 09/372,915, filed Aug. 12, 1999, now U.S. Pat. No. 6,396,397, Ser. No. 09/767,939, filed Jan. 23, 2001, now U.S. Pat. No. 6,590,719, Ser. No. 09/776,625, filed Feb. 5, 2001, now U.S. Pat. No. 6,611,202, Ser. No. 09/799,993, filed Mar. 6, 2001, now U.S. Pat. No. 6,538,827, Ser. No. 09/493,522, filed Jan. 28, 2000, now U.S. Pat. No. 6,426,492, Ser. No. 09/199,907, filed Nov. 25, 1998, now U.S. Pat. No. 6,717,610, Ser. No. 08/952,026, filed Nov. 19, 1997, now U.S. Pat. No. 6,498,620, and Ser. No. 09/227,344, filed Jan. 8, 1999, now U.S. Pat. No. 6,302,545, International Publication No. WO 96/38319, published Dec. 5, 1996, and International Publication No. WO 99/23828, published May 14, 1999, the disclosures of which are collectively incorporated herein by reference. 
     For example, VPM  14  can be utilized in a vehicle equipped with a side object detection system utilizing stereoscopic imaging from cameras located in the driver-side exterior mirror assembly and/or in the passenger-side exterior mirror assembly, such as is described in commonly assigned patent application Ser. No. 09/372,915, filed Aug. 12, 1999, now U.S. Pat. No. 6,396,397, the disclosure of which is hereby incorporated herein by reference, and further equipped with a CMOS camera-based headlamp controller as disclosed in commonly assigned U.S. Pat. Nos. 5,796,094 and 6,097,023, the disclosures of which are hereby incorporated herein by reference, and with the various image outputs being processed by the VPM. In this regard, should the vehicle be equipped with high intensity discharge (HID)/gas discharge headlamps (as known in the automotive lighting art), then the VPM can receive the output signal from a forward-facing CMOS camera (preferably mounted at or in the interior rearview mirror assembly and viewing oncoming headlights of approaching vehicles through the front windshield of the vehicle) and the VPM can control the intensity and/or direction of the light beam output from the HID headlamps as a function of the light level of the oncoming approaching headlamps as detected by the interior rearview mirror located forward-facing multipixel CMOS camera-on-a-chip light detector. Preferably, the intensity of the light beam output by the vehicle&#39;s HID lamps is inversely proportional to the intensity of the detected oncoming headlamps and, most preferably, the intensity of the HID headlamps is continuously variable inversely proportional to the intensity of the oncoming headlight intensity of approaching vehicles as detected by the forward-facing CMOS camera. 
     Further, and preferably, the vehicle may be equipped with a mobile cellular phone that is docked into a cell phone cradle system (such as in the CellPort 3000 system available from Cellport Systems Inc. of Boulder, Colo.) to allow a driver to conduct a hands-free telephone call when driving, and to provide the driver the option of undocking the cellular phone as desired in order to use the cellular phone, for example, when the driver departs the vehicle. The cell phone cradle system can include a sound-processing system (preferably including a microphone or microphone array, and such as is disclosed in commonly assigned patent application Ser. No. 09/466,010, filed Dec. 17, 1999, now U.S. Pat. No. 6,420,975, the disclosure of which is hereby incorporated herein by reference, and other accessories, and with the cell cradle providing outputs at least partially processed by the VPM. 
     The vehicle may also be equipped with a navigational system, such as a global positioning system, and with controls and/or functions of said navigational system being at least partially processed by VPM  14 . For a vehicle equipped with a GPS system and with a cell phone cradle (such as the CellPort 3000 system), a control input can be provided in the interior of the vehicle (such as at or on the interior mirror assembly) and/or a voice command control system can be provided whereby when the control input and/or voice command is actuated, a call is initiated to an external service (such as an emergency service of a concierge service or an information service) located remote from the vehicle and wherein the location of the vehicle (as generated by the vehicular navigational system) is automatically transmitted to the external service so that the external service can know the location of the vehicle and so provide assistance, advice and/or directions, and the like, to the driver of that vehicle. Such communication of geographic positional data can be transmitted by telecommunication via a phone network (such as Sprint or MCI or ATT, or the like) in a voice-over-data format allowing the driver to have a conversation with the service provider (and/or with another party) concurrent with the transmission of the vehicle location information to the service provider via telephonic linkage via the docked cell phone (or, optionally, via a BLUETOOTH or similar short-range RF wireless link between a cellular phone in, for example, the pocket of a driver and a cell phone linking/telecommunication/telematic station located, for example, at an interior rearview mirror assembly of the vehicle or in a dashboard or console area of the vehicle) to the external service provider. Preferably, at least some of such processing is handled by VPM  14  and, in particular, when videoconferencing is used. 
     The present invention can be used in a lane change aid system such as disclosed in a commonly assigned provisional patent application Ser. No. 60/309,022 filed Jul. 31, 2001, and a utility patent application filed concurrently herewith by Schofield for an AUTOMOTIVE LANE CHANGE AID, now U.S. Pat. No. 6,882,287, the disclosures of which are hereby incorporated herein by reference. 
     Also, a night vision system camera (such as an infrared detecting microbolometer night vision camera or a CMOS/near-IR detecting camera used in conjunction with a near-IR laser source for illumination forward of the vehicle) and an intelligent headlamp controller (such as a forward-facing CMOS video camera that automatically detects approaching vehicles and that dims the headlights of the host vehicle in response) can have their outputs combined/fused in accordance with the present invention to identify objects hazardous to the driver, such as a deer crossing the road ahead of the vehicle as the vehicle travels down a dark road at night. The control can, in response, automatically activate one or both existing headlamps, for example, to flash them or to move from a low-beam state to a high-beam state or to activate an additional headlamp or fog lamp or to adjust headlamps to high beam so that the object may be illuminated for the driver. Current night vision systems may either provide too much information for the driver to usefully assimilate or may distract him/her from attention to the road. The above combination achieved via the fusion system of the present invention allows use of the night vision system/intelligent headlamp controller to automatically provide extra forward illumination at the time required for the driver to take action to avoid a problem, which is the real intent behind the night vision system in the first place. The fusion of these inputs into a single processor achieves optimized nighttime driving safety. Note that a single forward-facing camera can perform both the night vision and intelligent headlamp control functions. 
     VPM  14  may receive both wired inputs and wireless inputs. For example, a restricted-range RF wireless communication device such as a BLUETOOTH device (housed, for example within an inside mirror or housed elsewhere in the interior cabin such as in an overhead console or a facia/instrumentation panel) can be used as a convenient channel location for the programming or reprogramming of various types of radio-frequency (RF) devices in a vehicle and/or to facilitate the use of RF as a means to program or reprogram non-RF devices to provide drivers with a more complete personalization of a vehicle (e.g., trainable garage door open, memory seat/mirror position, outside mirror position, etc.). This can be used in, for example, rental cars where an RF signal can be provided (such as via an RF transmitter located in the interior mirror assembly or in a windshield electronic accessory module) from a personal display assistant device (PDA) such as a PalmPilot® PDA and thus provide a driver with immediate personalization to include temperature/climate control, radio setting, exterior mirror reflector position and other preferences. 
     In accordance with U.S. Pat. Nos. 5,949,331 and 6,222,447, incorporated by reference above, a display system of the equipped vehicle displays a synthesized image that visually informs the driver of what is occurring in the area surrounding the equipped vehicle. The displayed image is synthesized from the camera outputs and, preferably, approximates a substantially seamless panoramic view as would be viewed by a single virtual camera located exterior the equipped vehicle. 
     Changes and modifications in the specifically described embodiments can be carried out without departing from the principles of the invention, which is intended to be limited only by the scope of the appended claims, as interpreted according to the principles of patent law including the doctrine of equivalents.