Abstract:
A wearable lifelogging device for generating and associating image data, time data and location data. The device comprises a positioning sensor for receiving a geographic position signal and generating the location data, a motion sensor for generating motion data, a timer for generating the time data, a camera device for generating the image data, a storage device for storing the image data, time and location data, a processing device configured to receive and process the location data, the motion data, the time data and the image data, and a housing enclosing said positioning sensor, motion sensor, timer, camera device, storage device and processing device. The housing, except for the camera, is free from user input interface.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims the benefit of U.S. Patent Application No. 61/890,558, filed Oct. 14, 2013, the entire contents of which are incorporated herein by reference. 
     
    
     FIELD 
       [0002]    The present disclosure relates to a method for lifelogging and to a system which implements such a method. 
       BACKGROUND 
       [0003]    Lifelogging is the process of digitally lifelogging life experiences. A lifelogging system usually comprises a wearable lifelogging device which automatically and continuously captures the user&#39;s activities in the form of text and/or sensor data, such as image, audio or video lifeloggings which are stored and organized for future use. 
         [0004]    People may want to log their activities for their own enjoyment, for example for keeping a diary or being able to retrieve and share personal experiences, including unanticipated ones, with others. Lifelogging may also be used for medical purposes, for example as an aid for people suffering from memory impairment. 
         [0005]    Another application for lifelogging devices is one of personal security; a lifelogging device may be used to provide evidence in the event the user is harassed or attacked. 
         [0006]    Yet another application is one of quality assurance; a lifelogging device may be used to document the user&#39;s activity. For example a police officer, nurse, physician, fireman, corrections officer, keeper or caretaker may use a lifelogging device to provide documentation of work performed and/or as evidence against accusations of malpractice or abuse. 
         [0007]    For a lifelog not to be inconvenient and cumbersome to produce, it is important that the lifelogging system be user friendly and interfere as little as possible with the user&#39;s daily routine. It is desirable to improve existing lifelogging systems in these respects. 
       SUMMARY 
       [0008]    Some embodiments disclosed herein may improve the user experience of lifelogging systems. Some embodiments may provide a lifelogging system which is easy, efficient and satisfying to use. Embodiments are set forth in the description and drawings. 
         [0009]    According to a first aspect, there is provided a wearable lifelogging device for generating and associating image data, time data and location data. The device comprises a positioning sensor for receiving a geographic position signal and generating the location data, a motion sensor for generating motion data, a timer for generating the time data, a camera device for generating the image data, a storage device for storing the image data, time and location data, a processing device configured to receive and process the location data, the motion data, the time data and the image data, and a housing enclosing said positioning sensor, motion sensor, timer, camera device, storage device and processing device, wherein the housing, except for the camera, is free from user input interface. 
         [0010]    The term “user input interface” is defined as a device for detecting a relative motion between a user, e.g. the user&#39;s hand or finger, and the housing. Such devices include buttons, knobs, wheels, switches, touch sensors and the like. 
         [0011]    The “location data” may be data which directly or indirectly identifies a geographic position, such as “clear text” position coordinates or raw data, e.g. data related to a satellite signal, which needs to be processed in order for position information to be derived. 
         [0012]    The fact that the device has no user input interface adds to the user&#39;s experience of the device “not being there”, i.e. while the device is being worn, there will be nothing the user can do to interact with it, and thus there will be nothing that attracts the user&#39;s attention to it, e.g. in the sense that there are no buttons inviting the user to fidget or even providing a possibility of interaction. All of this adds to keeping the device&#39;s interference with the user&#39;s daily habits to a minimum. Likewise, to a third party, the mere presence of the device will lead to the conclusion that it is active, since there is no way of manipulating it when it is being worn. 
         [0013]    The housing may present at least one opening, selected from a group consisting of a camera opening, an indicator opening, a communication port and an attachment recess for allowing the device to be worn by a user. 
         [0014]    The indicator may be e.g. one or more LEDs, a display, etc. 
         [0015]    The device may further comprise an attachment device in the form of a clip, a pin, a noose, a through hole, etc. 
         [0016]    The processing device may be configured to autonomously capture said image data, said time data and said location data. For example the device may take photos at a regular time interval, which may be predetermined, at a random interval (possibly with a variable likelihood that can be adjusted) and/or on receipt of specific sensor data, such as sound, movement, light, etc. 
         [0017]    According to a second aspect, there is provided a method of controlling a wearable lifelogging device, comprising the steps of: providing a wearable lifelogging device comprising a camera unit, a motion sensor and a processing device; receiving an image signal from the camera unit; receiving a sensor signal from the motion sensor; processing the image signal to determine whether it, during a first predetermined time period, represents an amount of light exceeding a predetermined light level; processing the sensor signal to determine whether it, during a second predetermined time period, represents an amount of motion exceeding a predetermined motion level; and causing the camera unit to generate another image signal only if the amount of light exceeds the predetermined light level and the motion level exceeds the predetermined motion level. 
         [0018]    A lifelogging device is defined as a wearable device which is configured for continuous or intermittent capture of images of the user and/or the user&#39;s experiences. Images thus captured may be associated with data indicating time/date and/or geographic position information for the respective image. The lifelogging device may be configured with an integrated intermediate image and data storage device. In the alternative, the lifelogging device may be configured for online transmission of image and data to a network-accessible storage device. 
         [0019]    Hence, the lifelogging device is active unless it has not moved appreciably for a certain amount of time or the surroundings are darker than a certain level. The lifelogging device will therefore not produce large numbers of completely dark or identical photographs. Moreover, using the wearable lifelogging device becomes extremely easy and requires minimal effort. For example, a user only has to start wearing the lifelogging device to activate it and to put it in a pocket or on a table to deactivate it. The motion sensor may generate orientation and/or position data which is associated with each photograph so that the photographs are displayed with the correct orientation regardless of the orientation of the camera when the photograph is taken. 
         [0020]    The method may further comprise processing the sensor signal to determine whether it, during a third predetermined time period, corresponds to a predetermined gesture. 
         [0021]    The user may thereby easily trigger the camera to take a photograph at a particular moment by, for example, tapping the camera twice, or any other number of times. 
         [0022]    The method may further comprise connecting the lifelogging device to a network, and receiving lifelogging device control data via the network while the lifelogging device is connected to the network, wherein the lifelogging device control data comprises image capture frequency control data. 
         [0023]    According to a third aspect, there is provided a lifelogging system comprising a wearable lifelogging device for generating and associating image data, time data and location data. The wearable lifelogging device comprises a housing substantially enclosing: a positioning system for receiving a geographic position signal and generating the location data; a motion sensor for generating motion data; a timer for generating the time data; a camera device for generating the image data; a storage device for storing the image data, time and location data; a processing device configured to receive and process the location data, the motion data, the time data and the image data; a communication interface for transmitting the location data, the time data and the image data, and for receiving lifelogging device control data; a user interface for receiving a signal indicating user input for controlling the lifelogging unit; a network-based storage device configured for storing, organizing and analyzing the location data, time data and image data generated by the lifelogging unit; and a communication device, connectable to the communication interface for receiving the location data, the time data and the image data from the lifelogging device, for transmitting the location data, the time data and the image data to the network-based storage device, and for transmitting the control data to the lifelogging device. The user interface is configured such that, when the communication device is not connected to the communication interface, the signal indicating user input is based on data selected from a group consisting of the motion data and the image data. 
         [0024]    A network-based storage device is defined as a storage device which is accessible via a network. The storage device may be provided as a physical device which is owned by the user or an organization associated with the user. In the alternative, the storage device may be provided as a storage service which is accessible via the network. 
         [0025]    Since the wearable lifelogging device receives control data from the communication device, it may lack buttons, knobs, switches or similar means for controlling the device. A design having a reduced number of components may result in a simpler and more economical production process. Such a design can also make the wearable lifelogging device very user friendly since the wearable lifelogging device requires no user input during use. Once the control parameters are set using the communication device, all the user is required to do in order to start lifelogging is to wear the wearable lifelogging device. Ease of use and minimal interference with the user&#39;s activities are essential features for a device which is supposed to be worn regularly. Such features are also likely to make the wearable recording unit more attractive to people who are interested in lifelogging but uninterested in electronic gadgets. 
         [0026]    Still, despite lacking buttons, the wearable lifelogging device is highly configurable via the communication device with which a user may set control parameters for the wearable lifelogging device. The communication device may also be used to set control parameters for the network-based storage device. 
         [0027]    The processing device may be configured to associate the image data with respective time data and location data. 
         [0028]    Hence, the images may be analyzed and organized based on time and location as well as image characteristics. 
         [0029]    The communication device may comprise: a lifelogging device interface adapted for communication with the communication interface of the lifelogging device, and a network interface adapted for communication with the network-based storage device. 
         [0030]    The communication device may be provided as a separate unit, which is connectable to the lifelogging device via the lifelogging device interface and to the network-based storage device via the network interface and a network. 
         [0031]    The lifelogging device interface may comprise a connection selected from a group consisting of an electric connection, an optical connection, a radio frequency based connection and an inductive connection. 
         [0032]    The network interface may comprise a connection selected from a group consisting of a cellular network connection, a wireless LAN connection and a wired LAN connection. 
         [0033]    The communication device may comprise a power supply module for supplying battery charging power to the lifelogging unit. 
         [0034]    The power supply module may comprise a power connection selected from a group consisting of an electric connection and an inductive connection. 
         [0035]    The lifelogging system may further comprise a user terminal, comprising a processing device, a presentation device, a user input device and a communication unit for receiving the image data and for transmitting user control data. 
         [0036]    The communication device may be integrated with the user terminal, and wherein the communication unit of the user terminal is configured to receive the image data from the lifelogging unit and optionally to transmit the image data to the network-based storage device. 
         [0037]    The communication unit of the user terminal may be configured to receive the image data from the network-based storage device. 
         [0038]    The lifelogging system may further comprise an image data processing service, which is configured to: receive the user control data from the user terminal, process the user control data to derive image control data, receive the image data from the network-based storage device, and process the image data in accordance with the image control data. 
         [0039]    The lifelogging system may further comprise a lifelogging device control service, which is configured to: receive the user control data from the user terminal, process the user control data to derive lifelogging device control data, and transmit the lifelogging device control data to the lifelogging device when the lifelogging device is connected to the network-based storage device. 
         [0040]    According to a fourth aspect, there is provided a wearable lifelogging device for generating and associating image data, time data and location data. The device comprises a positioning sensor for receiving a geographic position signal and generating the location data, a motion sensor for generating motion data, a timer for generating the time data, a camera device for generating the image data, a storage device for storing the image data, time and location data, a processing device configured to receive and process the location data, the motion data, the time data and the image data, a housing enclosing said positioning sensor, motion sensor, timer, camera device, storage device and processing device, the housing presenting at least one major surface and side surfaces extending from edges of the major surface, and an attachment device in the form of a clip, which extends beyond one of the side surfaces, as seen in a direction parallel with the main surface. 
         [0041]    The main surface may be a front or rear surface of the lifelogging device. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0042]    For a more complete understanding of embodiments of a lifelogging device, system, and associated methods, reference should now be had to the embodiments shown in the accompanying drawings and described below. In the drawings: 
           [0043]      FIG. 1  is a schematic illustration of components of a lifelogging system. 
           [0044]      FIGS. 2   a - 2   c  are schematic illustrations of different configurations of a lifelogging system. 
           [0045]      FIG. 3  is a front view of an embodiment of lifelogging device. 
           [0046]      FIGS. 4   a - 4   c  are side views illustrating different embodiments of the lifelogging device of  FIG. 3 . 
       
    
    
     DETAILED DESCRIPTION 
       [0047]    The following detailed description of embodiments refers to the accompanying drawings, which illustrate specific embodiments. Other embodiments having different structures and operation do not depart from the scope of the present disclosure. 
         [0048]    Referring to the drawings, where like reference numerals refer to the same or similar parts,  FIG. 1  illustrates schematically components of a lifelogging system  1 . The system  1  comprises a wearable lifelogging device  2  which has a weather protected housing  3  which encloses a GPS unit  4 , an accelerometer  5 , a timer  6  (which may have the form of a real-time clock (RTC)), a camera  7 , a storage device  8  which may comprise volatile and non-volatile memory, a CPU  9 , a rechargeable battery  10 , a communication interface  11  and a user interface  12 . A clip  13  is arranged on the outside of the housing. The system  1  also comprises a first communication device  20  which has interfaces  21  and  22  for communicating with the lifelogging device  2  and a network-based storage service  30 , respectively. The first communication device  20  can have a controller  23  and a charger  24 . The network-based storage service  30  may comprise a storage service  31  and a computing service  32 . The network-based storage service  30  may also be connected to a second communication device  40  via the latter&#39;s interface  41 . The second communication device  40  also comprises application software  42 . 
         [0049]    Dashed lines represent connections  50 ,  51  and  52  between the components of the lifelogging system  1 . 
         [0050]    When a user wears the lifelogging device  2 , for example by attaching it to a piece of clothing or a necklace, the camera  7  may be preset to automatically take two photographs a minute. It is also possible to allow the user to trigger the camera to take a photograph by performing a predetermined gesture, such as tapping the camera once, twice or three times within a predetermined time period and possibly in a predetermined direction. 
         [0051]    The CPU  9  may be programmed to stop taking photographs, power off and/or cause the camera  7  to hibernate or go into a low-power mode (e.g. by turning off one or more other sensors), if it receives a predetermined sensor signal from the camera indicating that the photograph is darker than a predetermined level. 
         [0052]    The CPU  9  may also be programmed to stop taking photographs, power off and/or cause the camera  7  to hibernate or go into a low-power mode (e.g. by turning off one or more other sensors), if it receives a sensor signal from the accelerometer  5  indicating that the lifelogging device  2  has moved less than a predetermined amount during a predetermined amount of time. 
         [0053]    With each photograph, the CPU  9  may associate location data from the GPS unit  4 , orientation data from the accelerometer  5  and time (optionally including date) data from the timer  6 . The image, location, orientation and time data of the photograph are stored in non-volatile memory on the storage device  8  and transferred via the first communication device  20  to the storage service  31  of the network-based storage service  30  when a connection  50  is established between the lifelogging device  2  and the first communication device  20 . The transfer may occur during charging of the battery  10  by the charger  24  and the storage may be encrypted. 
         [0054]    The first communication device  20  may be a docking station, a smartphone, a tablet computer, a desktop computer or a laptop computer. 
         [0055]    The connection  50 , which connects the lifelogging device  2  to the first communication device  20  via the interfaces  11  and  21 , may be a wired connection, such as a micro-USB or USB connection, or a wireless connection, such as a wireless LAN, Bluetooth®, NFC, IR, CDMA, GSM, 3G or 4G connection. 
         [0056]    The protocol used for communication between the lifelogging device  2  and the first communication device  20  may be the USB mass storage device protocol or a device-specific protocol. A device-specific protocol may comprise features making communication possible only between a specific lifelogging device  2  and a specific communication device  20 , which would make it more difficult for an unauthorized person to retrieve the data stored on the lifelogging device  2 . 
         [0057]    The connection  51 , which connects the first communication device  20  to the network-based storage service  30  via the interface  22 , may be a wired connection, such as a wired LAN connection, or a wireless connection, such as wireless LAN, CDMA, GSM, 3G or 4G connection. 
         [0058]    The protocol used for communication between the first communication device  20  and the network-based storage service  30  may be TCP/IP, HTTP, HTTPS, SSL and TLS. 
         [0059]    The network-based storage service  30  may be a REST service. 
         [0060]    The computing service  32  of the network-based storage service  30  may analyze and organize the photographs based on its image, location, orientation and/or time data. The photographs may be organized on a timeline and into groups of photographs fulfilling certain criteria, such as being from the same surroundings. The criteria may be user defined and the colors of the images may be used to determine which photographs were taken in the same surroundings. The photographs may be analyzed and their relevance assessed using criteria based on, for example, motion blur, contrast, composition, light, face recognition and object recognition. A group of photographs fulfilling certain criteria may be analyzed in order to select a photograph which is particularly representative, according to some criteria, of that group of photographs. The selected photograph may be used to give the user a rough idea of what the photographs in the group of photographs are showing and when they were taken. 
         [0061]    The user can use a second communication device  40 , for example a smartphone, a tablet computer, a desktop computer or a laptop computer, to access the photographs and to set control parameters for the lifelogging device  2 , the network-based storage service  30  and the first communication device  20 . 
         [0062]    Control parameters may, for example, determine the image capture rate and the time dependence of the image capture rate. For example, a user may set a higher image capture rate during a certain time period of a certain day. Control parameters may also determine whether a photograph stored on storage device  31  can be accessed by other users. 
         [0063]    The user may use the second communication device  40  to perform computing functions of the computing service  32 . A computing function may be photo editing. 
         [0064]    The application software  42 , which, for example, can be a web browser or an application for smartphones or tablet computers, may be used to perform the computing functions and to set control parameters. 
         [0065]    The connection  52 , which connects the second communication device  40  to the network-based storage service  30  via the interface  41 , may be a wired connection, such as a wired LAN connection, or a wireless connection, such as a wireless LAN, CDMA, GSM, 3G or 4G connection. 
         [0066]    The protocol used for communication between the second communication device  40  and the network-based storage service  30  may be TCP/IP, HTTP, HTTPS, SSL and TLS. 
         [0067]    The network-based storage service  30  may send push notifications to the second communication device  40 , for example when photographs taken by the lifelogging device  2  have been transferred to the network-based storage service  30 . 
         [0068]    The network-based storage service  30  may send data to and receive data from devices which are not a part of the lifelogging system  2 . For example, data captured by the GPS unit  4  may be sent to a third-party which analyses the data and sends the coordinates represented by the data to the network-based storage service  30 . The network-based storage service  30  may send and receive data, for example image data, to other network-based services, for example social-networking services. 
         [0069]      FIG. 2   a  illustrates schematically a lifelogging system  1  in which the lifelogging device  2  is configured to send image, location, orientation and time data to a first communication device  20  over a connection  50  which may be a wired connection, such as a micro-USB, USB or wired LAN connection, or a wireless connection, such as a wireless LAN, bluetooth, NFC, IR, CDMA, GSM, 3G or 4G connection. The protocol used for communicating over the connection  50  may be the USB mass storage device protocol, TCP/IP, HTTP, HTTPS, SSL or TSL or a device-specific protocol. 
         [0070]    The first communication device  20  may be a docking station, a smartphone, a tablet computer, a desktop computer or a laptop computer. 
         [0071]    The first communication device  20  is configured to send the image, location, orientation and time data to the network-based storage service  30  over a connection  51  which may be a wired connection, such as a wired LAN connection, or a wireless connection, such as wireless LAN, CDMA, GSM, 3G or 4G connection. The protocol used for communicating over the connection  51  may be TCP/IP, HTTP, HTTPS, SSL or TSL. 
         [0072]    A user can access the data stored on the network-based storage service  30  through a second communication device  40  which is also configured to send control parameters to the network-based storage service  30  over a connection  52 . The connection  52  may be a wired connection, such as a wired LAN connection, or a wireless connection, such as a wireless LAN, CDMA, GSM, 3G or 4G connection. The protocol used for communicating over the connection  52  may be TCP/IP, HTTP, HTTPS, SSL or TSL. 
         [0073]    The control parameters sent by the second communication device  40  may comprise control parameters for the network-based storage service  30 , the first communication device  20  and the wearable lifelogging device  2 . The network-based storage service  30  transfers, over the connection  51 , control parameters to the first communication device  20  which, in turn, transfers the control parameters to the wearable lifelogging device  2  over the connection  50 . 
         [0074]      FIG. 2   b  illustrates schematically a lifelogging system  1  in which a wearable lifelogging device  2  is configured to communicate directly with a second communication device  40  and a network-based storage service  30  over connections  53  and  54 , respectively. 
         [0075]    The second communication device  40  may be a smartphone, a tablet computer, a desktop computer or a laptop computer. 
         [0076]    The connection  53  may be a wired connection, such as a wired LAN connection, or a wireless connection, such as a wireless LAN, CDMA, GSM, 3G or 4G connection. The protocol used for communicating over the connection  53  may be TCP/IP, HTTP, HTTPS, SSL or TSL. 
         [0077]    The connection  54  which may be a wired connection, such as a micro-USB, USB or wired LAN connection, or a wireless connection, such as a wireless LAN, bluetooth, NFC, IR, CDMA, GSM, 3G or 4G connection. The protocol used for communicating over the connection  54  may be the USB mass storage device protocol, TCP/IP, HTTP, HTTPS, SSL or TSL or a device-specific protocol. 
         [0078]    If a first communication device  20  is provided, the lifelogging device  2  may also communicate with the first communication device  20  which may be configured to communicate with the network-based storage service  30 . 
         [0079]    The first communication device  20  may be a docking station, a smartphone, a tablet computer, a desktop computer or a laptop computer. 
         [0080]    The first communication device  20  may communicate with the be lifelogging device  2  over a wired connection, such as a micro-USB, USB or wired LAN connection, or a wireless connection, such as a wireless LAN, bluetooth, NFC, IR, CDMA, GSM, 3G or 4G connection. The protocol used for communicating may be the USB mass storage device protocol, TCP/IP, HTTP, HTTPS, SSL or TSL or a device-specific protocol. 
         [0081]    The first communication device  20  may communicate with the network-based storage service  30  over a wired connection, such as a wired LAN connection, or a wireless connection, such as a wireless LAN, CDMA, GSM, 3G or 4G connection. The protocol used for communicating may be TCP/IP, HTTP, HTTPS, SSL or TSL. 
         [0082]      FIG. 2   c  illustrates schematically a lifelogging system  1  in which a wearable lifelogging device  2  and a network-based storage service  30  are configured to communicate over a connection  53  which may be a wired connection, such as a wired LAN connection, or a wireless connection, such as a wireless LAN, CDMA, GSM, 3G or 4G connection. The protocol used for communicating over the connection  53  may be TCP/IP, HTTP, HTTPS, SSL or TSL. 
         [0083]    Communication also occurs between the network-based storage device  30  and a communication device  40  over a connection  52  which may be a wired connection, such as a wired LAN connection, or a wireless connection, such as a wireless LAN, CDMA, GSM, 3G or 4G connection. The protocol used for communicating over the connection  52  may be TCP/IP, HTTP, HTTPS, SSL or TSL. 
         [0084]    The communication device  40  may be a smartphone, a tablet computer, a desktop computer or a laptop computer. 
         [0085]      FIG. 3  schematically illustrates a front view of a lifelogging device  2 , which is attached by means of a clip to a front portion of a collar  201  of a piece of clothing  200 , such as a t-shirt, sweater, cardigan, jacket, shirt, coat, blouse or the like. 
         [0086]    The lifelogging device  2  has a housing  3  which presents a pair of opposing main surfaces  301 ,  302 , one of which constituting a front surface  301  and the other one constituting a rear surface  302 . The main surfaces are generally rectangular (although with rounded corners) and presents an upper side surface  303 , a lower side surface  304  and left and right side surfaces  305 ,  306 . At the front surface,  301 , there is an opening for the camera  7  as described above. 
         [0087]    The lifelogging device  2  further comprises a clip  13 ,  13 ′,  13 ″, by which the attachment to the piece of clothing  200  is effected. The clip comprises an attachment portion  133 ,  133 ′,  133 ″, a clamping portion  132  and an intermediate portion  131 . 
         [0088]    The attachment portion  133 ,  133 ′,  133 ″connects the clip with the housing  3 . The clamping portion  132  is designed to clamp the piece of clothing  200  against the rear surface  302  of the housing  3 . Hence, the clamping portion  132  may be biased towards the housing  3 . 
         [0089]    The rear surface  302  of the housing  3  may present at least a portion having higher coefficient of friction than the front surface  301  and/or than the side surfaces  305 ,  306 . For example, the entire rear surface  302  may be formed of rubber or rubber-like material, such as TPU, TPE or the like. As another option, the rear surface may be provided with dots, protrusions or dimples of such rubber or rubber-like material. 
         [0090]    The clip may present a portion  131 ,  131   a ,  131   b , which protrudes beyond the at least one of the side surfaces  303 ,  304 ,  305 ,  306 , as seen in a direction parallel with the front and/or rear surface  301 ,  302 . 
         [0091]    As illustrated in  FIG. 4   a , the attachment portion  133  of the clip  13  may be connected to a side surface  303  of the housing  3 , with the connection being spaced from all edges of this side surface  303 . The attachment portion may be closer to one of the edges of the side surface  303  than the other edges, and the attachment portion may extend substantially parallel with this edge. 
         [0092]    As illustrated in  FIG. 4   b , the attachment portion  133 ′ of the clip  13 ′ may be connected to a side surface  303  of the housing  3 , with the connection being adjacent or on one of the edges of this side surface  303 , such as one of the long side edges of the side surface  303 . 
         [0093]    As illustrated in  FIG. 4   c , the attachment portion  133 ″ of the clip  13 ″ may be connected to the rear surface  302  of the housing  3 , with the connection being spaced from all edges of this rear surface  302 . The attachment portion may be closer to one of the edges of the rear surface  302  than the other edges, and the attachment portion may extend substantially parallel with this edge. 
         [0094]    The portion  131  protruding beyond the side surface may protrude by at least 5%, preferably 10%, 15% or 20% of a length of the housing  3  as seen in a direction parallel with the extension of the clip  13 ,  13 ′,  13 ″. 
         [0095]    The protruding portion  131  may form a bend through about 180°. 
         [0096]    The clip may be formed of a metallic material or a plastic material having sufficient strength and elasticity to operate as a clip in a range of temperatures in which the lifelogging device  2  is intended to be operable. 
         [0097]    The clip may be formed as a single clip or as two or more pieces which are separate and/or connected to each other. For example, the clip may present two attachment portions  133   a ,  133   b , which connect to each other at a free end of the clip  13 ,  13 ′,  13 ″. 
         [0098]    Although specific embodiments have been illustrated and described herein, those of ordinary skill in the art appreciate that any arrangement which is calculated to achieve the same purpose may be substituted for the specific embodiments shown and that the embodiments herein have other applications in other environments. This application is intended to cover any adaptations or variations of the present disclosure. The following claims are in no way intended to limit the scope of the disclosure to the specific embodiments described herein.