WO2011154997A1 - 撮像システム、撮像装置および表示装置 - Google Patents
撮像システム、撮像装置および表示装置 Download PDFInfo
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- 238000003384 imaging method Methods 0.000 title claims abstract description 194
- 238000004891 communication Methods 0.000 claims description 63
- 230000007423 decrease Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 12
- 238000000605 extraction Methods 0.000 description 8
- 238000012937 correction Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000000284 extract Substances 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000002123 temporal effect Effects 0.000 description 2
- 239000003086 colorant Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/63—Control of cameras or camera modules by using electronic viewfinders
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
Definitions
- the present invention includes an imaging device that captures an image according to an imaging condition and a display device that displays the captured image, and can appropriately display the display condition after the change according to a change in the display condition of the display device.
- the present invention relates to an imaging system, an imaging device, and a display device that change imaging conditions.
- the imaging device captures an image of a subject based on the set imaging conditions and generates an image signal.
- An image based on the image signal is displayed based on the condition.
- the imaging conditions of the imaging device and the display conditions of the display device are individually set, an image cannot be displayed properly unless the imaging conditions and the display conditions are matched. Therefore, there is an image display system that appropriately displays an image by changing display conditions in accordance with imaging conditions when the imaging device captures an image of a subject (Patent Document 1).
- the present invention has been made for such a problem, and an object thereof is to provide an imaging system capable of enhancing the reproducibility of a subject in an image.
- An imaging system includes: an imaging condition storage unit that stores an imaging condition that is a setting value related to imaging; an imaging unit that captures an image of a subject in accordance with the imaging condition stored in the imaging condition storage unit; A communication unit that communicates with a display device that displays the image signal; an imaging device that includes an imaging condition changing unit that changes the imaging condition stored in the imaging condition storage unit based on information received by the communication unit; A communication unit that communicates with the imaging device, a display condition storage unit that stores display conditions that are setting values related to display, and the image signal received by the communication unit is displayed according to the display conditions stored in the display condition storage unit.
- a display unit having a display condition changing unit for changing the display condition stored in the display condition storage unit, and the imaging condition corresponding to the display condition.
- the imaging condition determining unit changes the changed imaging condition.
- the imaging condition corresponding to the display condition is determined, and in the imaging apparatus, the imaging condition changing unit changes the imaging condition stored in the imaging condition storage unit to the imaging condition determined by the imaging condition determining unit. It is a feature.
- the imaging device is an imaging device connected to a display device that displays an image according to a display condition that is a setting value related to display and outputs the display condition to the outside, and has a setting value related to imaging.
- An imaging condition storage unit that stores a certain imaging condition; an imaging unit that captures an image of a subject in accordance with the imaging condition stored in the imaging condition storage unit; and outputs the image signal to the display device;
- a communication unit that receives the display condition sent from the display device; an imaging condition determination unit that determines the imaging condition corresponding to the display condition received by the communication unit; and the imaging condition that is determined by the imaging condition determination unit
- the imaging condition changing unit that changes the imaging condition stored in the imaging condition storage unit.
- the display device is a display device that captures an image according to an imaging condition that is a setting value related to imaging and is connected to an imaging device that can change the imaging condition from the outside, and is a display that is a setting value related to display
- a display condition storage unit that stores conditions, a display unit that displays an image captured by the imaging device according to the display conditions stored in the display condition storage unit, and the display conditions stored in the display condition storage unit
- a display condition changing unit that changes the imaging condition, an imaging condition determining unit that determines the imaging condition corresponding to the display condition, and a communication unit that communicates with the imaging device.
- the imaging condition determination unit determines the imaging condition corresponding to the changed display condition, and the determined imaging condition is changed to the previous one. It is characterized in that transmitted by the communication unit to the imaging device.
- the reproducibility of the subject in the image can be improved.
- FIG. 1 is a block diagram illustrating a configuration of a camera system according to Embodiment 1.
- FIG. 3 is a block diagram showing a configuration of a display in the camera system according to Embodiment 1.
- FIG. 2 is a block diagram illustrating a configuration of a camera in the camera system according to Embodiment 1.
- FIG. 6 is a flowchart showing an operation of a change extraction unit in the camera system according to Embodiment 1.
- FIG. 6 is a flowchart showing an operation of a communication command generation unit in the camera system according to Embodiment 1.
- FIG. 6 is a flowchart showing the operation of a camera image parameter adjustment unit in the camera system according to Embodiment 1.
- FIG. 6 is a block diagram illustrating a configuration of a camera system according to Embodiment 2.
- FIG. 10 is a correspondence diagram illustrating a relationship between camera image parameters and display image parameters in the camera system according to the second embodiment.
- 6 is a block diagram illustrating a configuration of a camera system according to Embodiment 3.
- FIG. 10 is a block diagram illustrating a configuration of a camera system according to Embodiment 3.
- FIG. 1 is a block diagram illustrating a configuration of a camera system according to Embodiment 1.
- the camera system according to the present embodiment is an in-vehicle camera system mounted on a vehicle.
- the camera system (imaging system) includes a host unit 1 (display device) installed in a vehicle and a camera unit 2 (imaging device) connected to the host unit 1 to image the surroundings of the vehicle. It is configured.
- the camera unit 2 captures an image of the surroundings of the vehicle, and the host unit 1 displays an image of the captured surroundings of the vehicle, thereby allowing the driver to check the situation of the surroundings of the vehicle.
- the electronic control unit 3 is an ECU (Electric Control Unit) that is generally mounted on a vehicle, and detects measurement values of various measuring devices mounted on the vehicle and outputs them as vehicle information.
- the host unit 1 performs processing using the vehicle information output from the electronic control unit 3.
- the host unit 1 includes a display 17 (display unit) that displays an image, and a display image parameter storage unit 11 (display) that stores display image parameters (display conditions) that are setting values for parameters for displaying an image on the display 17.
- a condition storage unit a display image parameter change unit 12 that changes the display image parameter stored in the display image parameter storage unit 11, and a changed parameter among the display image parameters stored in the display image parameter storage unit 11 is extracted.
- a change extraction unit 13, a communication command generation unit 14 that determines how to control the camera unit 2 based on the changed display image parameter extracted by the change extraction unit 13, and generates a communication command.
- Top A communication command transmission unit 15 (imaging condition output unit) that transmits a communication command generated by the mode generation unit 14 to the camera unit 2, and an image signal reception unit 16 that receives an image signal described later from the camera unit 2. Has been.
- the display image parameter changing unit 12 indicates that, among the vehicle information output from the electronic control unit 3, the driver of the vehicle operates the light switch to turn on the lamp mounted on the vehicle.
- An ILL signal (lighting signal) is detected, and the display image parameter stored in the display image parameter storage unit 11 is changed based on the detected ILL signal.
- the image signal received by the image signal receiving unit 16 is displayed on the display 17 based on the display image parameter stored in the display image parameter storage unit 11.
- the communication command generation unit 14 has a reference value of the display image parameter (usually a value set at the time of shipment from the factory), and how is the parameter related to imaging of the camera unit 2 based on the difference from the reference value? It decides whether to change to, and generates a command to convey the change.
- a reference value of the display image parameter usually a value set at the time of shipment from the factory
- the change extraction unit 13 and the communication command generation unit 14 capture an image based on the difference between the display image parameter stored in the display image parameter storage unit 11 and the reference value.
- An imaging condition determining unit that determines imaging conditions indicating the above is configured.
- the communication command transmitter 15 and the image signal receiver 16 constitute a communication unit 18.
- the reference value is stored in the communication command generation unit 14, but is stored in the display image parameter storage unit 11 so that it is read when the communication command generation unit 14 generates a communication command.
- a configuration for storing the reference value may be provided separately, and the communication command generation unit 14 may read out the configuration when generating the communication command.
- the host unit 1 has a reference display condition storage unit that stores reference values of display image parameters (display conditions).
- the camera unit 2 has a camera image parameter storage unit 21 (imaging condition storage unit) that stores a camera image parameter (imaging condition storage) that is a setting value for a parameter relating to how an image is captured by the camera, and communication between the host unit 1
- a communication command reception unit 22 that receives a communication command transmitted from the command transmission unit 15, and a camera image that changes a camera image parameter stored in the camera image parameter storage unit 21 based on the communication command received by the communication command reception unit 22
- a parameter adjustment unit 23 (imaging condition changing unit), a camera 24 (imaging unit) that is attached to the vehicle and that captures an image of the surroundings of the vehicle based on the camera image parameters stored in the camera image parameter storage unit 21
- the image signal output from the camera 24 is sent to the host unit 1 It is configured to include an image signal transmission section 25 for transmitting the image signal receiver 16.
- the communication unit 26 includes a communication command receiving unit 22 and an image signal transmitting unit 25.
- FIG. 2 is a block diagram showing the configuration of the display 17.
- a display 17 includes a color signal adjustment unit 171 that adjusts a color signal included in an image signal, a luminance signal adjustment unit 172 that adjusts a luminance signal included in the image signal, a backlight 173 as a light source, and a backlight.
- LCD panel 174 image display element for displaying an image obtained by modulating light output from 173 based on an image signal output from luminance signal adjustment unit 172, and backlight adjustment for adjusting the light emission amount of backlight 173
- the optical part 175 is comprised.
- the display image parameter storage unit 11 stores display image parameters as shown below. Display image parameters can be classified into those relating to image quality and those other than that.
- (Display image parameters other than those related to image quality) (B1) Automatic Color Control information. Information to keep the intensity of the color signal constant regardless of the intensity of the input signal. (B2) White Peak Control information. Information for keeping the intensity of the luminance signal constant regardless of the intensity of the input signal. (B3) Backlight dimming information (emission information). Information indicating the light emission amount of the backlight 175. (B4) LCD panel 174 dot size information (resolution information). (B5) Frame rate information of the display 17 (B6) Color space information. Information indicating the range of colors that can be displayed on the display 17.
- the color signal adjustment unit 171 includes (B1) automatic color adjustment information, (A1) gamma curve adjustment information, (A2) noise compression adjustment information, and (A3) color.
- Outline correction information (A5) HUE adjustment information, (A6) saturation adjustment information, (A7) contrast adjustment information, (A8) sharpness adjustment information, (B4) LCD panel 174 resolution information, and (B5) frame rate information Based on this, the color signal included in the image signal is adjusted.
- the luminance signal adjustment unit 172 includes (B2) white peak control information, (A1) gamma curve adjustment information, (A2) noise compression adjustment information, and (A4) luminance. Brightness included in image signal based on contour correction information, (A7) contrast adjustment information, (A8) sharpness adjustment information, (B4) resolution information of LCD panel 174, (B5) frame rate information, and (B6) color space information Adjust the signal.
- the backlight dimming unit 175 adjusts the amount of light emitted from the backlight 173 based on the (B3) backlight dimming information stored in the display image parameter storage unit 11 to thereby adjust the overall brightness of the LCD panel 174. adjust. Since the color space and resolution differ depending on the type of the LCD panel 174, it is desirable to adjust the image signal according to the type of the LCD panel 174. Therefore, the display image parameter changing unit 12 acquires panel type information indicating the type of the LCD panel 174, and sets the display image parameter stored in the display image parameter storage unit 11 to a value determined based on the acquired panel type information. (B4) The resolution information of the LCD panel 174, (B5) frame rate information, and (B6) color space information are changed.
- the display image parameter is changed depending on the type of the LCD panel, the image signal is adjusted by the color signal adjustment unit 171 and the luminance signal adjustment unit 172, and the light emission amount of the backlight 173 is adjusted by the backlight dimming unit 175.
- the subject imaged by the camera can be faithfully reproduced on the display.
- the camera image parameter storage unit 21 of the camera unit 2 stores the following camera image parameters. At least camera image parameters relating to image quality and imaging are stored.
- C1 Gamma curve adjustment information.
- C2) Filter processing switching information.
- C6) Contrast adjustment information.
- D1 Information on camera auto function.
- D2 Camera screen size information,
- D3 Camera frame rate information.
- (D1) Information on the auto function of the camera is a setting value set by the camera regarding the following imaging.
- (Camera auto function information) (E1) AE (automatic exposure) setting information. Parameters such as exposure area, convergence brightness, and temporal change to convergence brightness are included.
- (E2) AWB (automatic white balance) setting information Parameters such as balance area, convergence color space, and temporal change to the convergence color space are included.
- BLC black level control) setting information.
- FIG. 3 is a block diagram showing the configuration of the camera 24.
- the camera 24 images an object and outputs it as an image signal, such as an image sensor 241 such as a solid-state image sensor, a black level adjustment unit 242 that adjusts the black level of the image signal, and an image signal adjusted by the black level adjustment unit 242.
- the color signal adjustment unit 243 that adjusts the color signal included in the image signal and the luminance signal adjustment unit 244 that adjusts the luminance signal included in the image signal output from the color signal adjustment unit 243 are configured.
- the image sensor 241 is based on (E1) AE setting information, (E2) AWB setting information, (E3) AGC setting information, and (E4) BLC setting information among the parameters stored in the camera image parameter storage unit 21. Capture the subject.
- the image sensor 241 has automatic exposure (AE) and automatic white balance (AWB) functions, and (E1) AE setting information and (E2) AWB setting information stored in the camera image parameter storage unit 21. Since the automatic exposure and the automatic white balance are adjusted based on the above, it is possible to obtain an image of an optimal color state in an optimal exposure state.
- AE automatic exposure
- AVB automatic white balance
- the black level adjustment unit 242 adjusts the brightness of the blackest part of the image based on (C9) monochrome level information stored in the camera image parameter storage unit 21.
- the color signal adjustment unit 243 includes (C1) gamma curve adjustment information, (C2) filter processing switching information, (C3) contour enhancement step number switching information, (C4) HUE adjustment information, (C5) saturation adjustment information, (C6) The color signal included in the image signal is adjusted based on the contrast adjustment information, (C7) sharpness adjustment information, (C8) shading adjustment information, and (C9) monochrome level adjustment information.
- the luminance signal adjustment unit 244 includes (C1) gamma curve adjustment information, (C2) filter processing switching information, (C6) contrast adjustment information, (C7) sharpness adjustment information, (C8) shading adjustment information, and (C9) monochrome level adjustment.
- the luminance signal included in the image signal is adjusted based on the information.
- the image signal adjusted by the luminance signal adjustment unit 244 is output from the image signal transmission unit 27 to the host unit 1.
- the camera 24 generates and outputs an image signal according to the camera image parameter stored in the camera image parameter storage unit 21. Note that the resolution of the image indicated by the image signal differs depending on the type of image sensor.
- the operation of the camera system according to the present embodiment will be described.
- the camera system according to the present embodiment it is determined using the ILL signal output from the electronic control unit 3 that the surrounding of the vehicle has become dark.
- the ILL signal is used to turn on a lamp mounted on a vehicle that is output from the electronic control unit 3 that detects that the light switch has been operated when the driver operates the light switch to turn on the lamp. It is a signal that indicates that.
- the driver of the vehicle operates the light switch to turn on the lamp mounted on the vehicle when the surroundings of the vehicle become dark, it is possible to detect that the surroundings of the vehicle have become dark by detecting this ILL signal. it can.
- the ILL signal is in an ON state when it indicates that a lamp mounted on the vehicle has been turned on.
- the display image parameter changing unit 12 detects the ILL signal output from the electronic control unit 3. When the ILL signal changes from the OFF state to the ON state, the backlight dimming information stored in the display image parameter storage unit 11 is changed so that the light emission amount of the backlight 173 of the display 17 is reduced. To do. Further, the display image parameter changing unit 12 outputs a change notification for changing the display image parameter stored in the display image parameter storing unit 11 to the change extracting unit 13.
- the display image parameter change unit 12 is also a lighting signal acquisition unit that acquires a lighting signal indicating whether a lamp provided in the vehicle is turned on or off.
- FIG. 4 is a flowchart showing the operation of the change extraction unit 13.
- the change extracting unit 13 extracts a parameter that has changed among the parameters stored in the display image parameter storing unit 11 (S32 to S32). S34).
- the backlight dimming information is changed so as to reduce the light emission amount of the backlight 173
- the backlight dimming information is extracted as a parameter that has changed.
- FIG. 5 is a flowchart showing the operation of the communication command generation unit 14.
- the change extraction unit 13 extracts the changed display image parameter (S41)
- the communication command generation unit 14 obtains a difference amount indicating how much the extracted display image parameter has changed with respect to the reference value. Then, based on the difference amount, a change content indicating how to change the camera image parameter is determined (S42). For example, when a parameter for causing the backlight 173 to emit light at 100% is set as a reference value for backlight dimming information, the backlight dimming information causes the backlight 173 to emit light at 50%.
- the dynamic range of the gradation captured by the camera 24 is set to a value lower than the current setting in accordance with the amount of reduction or the reduction rate of the setting value of the backlight dimming information.
- the luminance value upper limit of the luminance range that can be imaged
- the upper limit of the luminance range that can be imaged is increased.
- the resolution of the small gradation part is increased by setting the dynamic range of the gradation captured by the camera 24 to a low value, and even when the light emission amount of the backlight 173 is small, It is possible to easily distinguish a portion having a small gradation.
- the camera image parameters include (E1) AE setting information, (E2) AWB setting information, (E3) AGC setting information, (E4) BLC setting information, and (C9 ) Since it is necessary to change the monochrome level adjustment information, the communication command generation unit 14 determines the change contents for changing these five parameters.
- a packing command for changing the plurality of parameters is generated (S44).
- a command for setting an imaging mode for imaging in direct sunlight or an imaging mode for imaging at night is set in advance, and the command is changed according to the change contents of the display image parameter. Can also be selected.
- a command for changing the single parameter is generated (S45). The generated command is transmitted from the communication command transmission unit 15 to the camera unit 2 as a communication command.
- FIG. 6 is a flowchart showing the operation of the camera image parameter adjustment unit 23.
- the camera image parameter adjusting unit 23 determines the content instructed to change by the communication command (S52).
- the camera image parameter instructed to be changed is changed (S53, S54).
- C9 Change the monochrome level adjustment information.
- the display image parameter changing unit 12 changes the backlight dimming information stored in the display image parameter storage unit 11 so that the amount of light emitted from the backlight 173 is larger than the current amount, and generates a communication command.
- the backlight dimming information is changed so that the light emission amount of the backlight 173 decreases or increases, and the reference Since the dynamic range captured by the camera 24 is changed in accordance with the difference from the value or the change in the light emission amount, the light emission amount of the backlight 173 changes and the brightness of the image displayed on the display 17 changes. Even when it changes darkly, it is easy to distinguish between gradations in dark parts with low gradation, and when it changes brightly, it is easy to distinguish between gradations in bright parts with high gradation. .
- the display image parameter changing unit 12 determines a time zone such as morning, night, and night according to the current time, and sets the value of the display image parameter according to the determined time zone. Specifically, for example, when the time is 6:00 pm, it is determined that it is night, and the backlight dimming information is changed so that the backlight of the display 17 becomes dark. When the time is 7:00 am, it is morning. The backlight dimming information is changed so that the backlight of the display 17 becomes bright.
- the time for determining whether it is morning / day / night may be changed according to the season determined from the date. Furthermore, the sunrise and sunset times may be calculated from the current position and date of the vehicle, and the morning and evening times may be determined using the sunrise and sunset times.
- the brightness of the display 17 may be determined by other methods. For example, the position of the sun is calculated from the date and time that are the current date and time, and the brightness and brightness of the display 17 is adjusted by determining the direction and intensity of sunlight that is inserted into the vehicle from the position and traveling direction of the vehicle. Specifically, for example, when sunlight enters the vehicle, it is difficult to see an image if the backlight of the display 17 is dark, so the backlight dimming information is changed so that the backlight is bright. Thereby, it is possible to cause the display 17 to display an appropriate image according to the surrounding environment.
- the brightness of the display 17 may be determined by other methods.
- the display image parameter is adjusted according to the illuminance measured by the illuminance sensor that measures the illuminance around the display 17 installed in the vehicle. For example, when the illuminance around the display 17 is low, it is difficult to see an image when the backlight of the display 17 is bright. Therefore, the backlight dimming information is changed so that the backlight becomes dark. Thereby, an image can be appropriately displayed on the display 17 according to the surrounding environment.
- the display image parameter changing unit 12 changes the display image parameters stored in the display image parameter storage unit 11 based on predetermined information such as an ILL signal and time information.
- the display information changing unit 12 may have a human interface that accepts changes in display image parameters by the user. Since the environment in which the display 17 is placed is various and the image states that the user likes are also various, it is possible to cope with arbitrary settings by the user.
- the communication command generation unit 14 obtains a difference amount with respect to a predetermined reference value of the display image parameter, and determines the camera image parameter based on the difference amount.
- the change amount of the newly set display image parameter from the value set immediately before it may be obtained, and the set camera image parameter may be changed by an amount corresponding to the obtained change amount. .
- the camera image parameter (imaging condition) corresponding to the changed display condition is calculated by the display device.
- the display device is notified that the display condition has been changed, and imaging is performed.
- the imaging condition may be calculated by the apparatus and changed to the calculated imaging condition.
- the camera system is mounted on a vehicle.
- the camera system is not limited to being mounted on a vehicle. The above also applies to other embodiments.
- Embodiment 2 In a device such as a driving assistance device that captures the surroundings of a vehicle with a camera and displays the surroundings of the vehicle on a display provided in the vehicle, the display appears to be the same as the driver actually observed.
- the display image parameter (B1) automatic color adjustment information is information relating to the color tone, but changing this information changes the color displayed on the display 17 of the same image signal. For example, when the driver adjusts (B1) automatic color adjustment information so that the display 17 displays a little reddish, a white subject is displayed as a reddish white when the image signal is displayed as it is.
- FIG. 7 is a block diagram illustrating a configuration of the camera system according to the second embodiment. Components that are the same as or correspond to those in FIG. 1 are given the same reference numerals, and descriptions thereof are omitted.
- the change extracting unit 13 changes (B1) automatic color adjustment information. Detected as a parameter.
- the communication command generation unit 14a stores (B1) automatic color adjustment information when a white subject is expressed in white as a reference value, and (B1) the difference from the reference value of the automatic color adjustment information. Ask. Then, the communication command generator 14a determines (B1) how the automatic color adjustment information has been changed based on the obtained difference amount. For example, in the case described above, it is determined that the automatic color adjustment information has been changed so that the automatic color adjustment is made reddish (B1).
- the communication command generation unit 14a determines (E1) AWB setting information of the camera so that an image signal in which a white subject is displayed in white on the display 17 is generated.
- (E1) AWB setting information is determined so that a white subject is imaged so as to be bluish white.
- (B1) AWB setting information obtained by changing the difference amount of the automatic color adjustment information so as to be necessary and sufficient to cancel the difference corresponding to the difference amount is obtained.
- a communication command for changing to such a value is created and transmitted from the communication command transmission unit 15 to the camera unit 2.
- the communication command receiving unit 22 receives the communication command indicating (E1) AWB setting information, and the communication command received by the camera image parameter adjusting unit 23 is stored in the camera image parameter storage unit 21 (E1). ) Change AWB setting information.
- the camera 24 outputs an image signal obtained by imaging the subject based on the changed (E1) AWB setting information, and the display 17 displays an image based on the image signal.
- the camera system according to the present embodiment is based on the difference between the (B1) AWB setting information stored in the display image parameter storage unit 11 and the predetermined reference value, so that the difference is canceled out.
- the image is displayed on the display 17 by the driver. Can be displayed in the same color as actually observed.
- the (E1) AWB setting information of the camera image parameter is changed based on the (B1) automatic color adjustment information of the display image parameter, but when other parameters of the display image parameter are changed, Camera image parameters associated with the changed parameters can also be changed.
- the display image parameter (B2) white peak control information
- the camera image parameters (E3) AGC setting information, (E4) BLC setting information, and (C9) monochrome level adjustment information are changed.
- the white peak control information is information representing a monochrome luminance range in an image displayed on the display 17.
- the driver adjusts the white peak control information so that, for example, the image signal is displayed in gray even when the image signal is white with normal brightness, the image signal transmitted from the camera unit 2 is not adjusted.
- a white subject is displayed in gray on the display 17.
- (B2) white peak control information as in the case of (B1) automatic color adjustment information, a difference amount from a reference value in which a white subject is expressed in white is extracted, and a camera image is based on this difference amount.
- (E3) AGC setting information, (E4) BLC setting information, and (C9) monochrome level adjustment information stored in the parameter storage unit 21 are changed. At this time, the brightness of the image signal picked up by the camera 24 is set to be bright so that it becomes larger when the (B2) white peak control information is set to be displayed darker than the reference value.
- (E3) AGC setting information, (E4) BLC setting information, and (C9) B / W level adjustment information are changed so as to be smaller. Thereby, a white subject can be displayed in white on the display 17.
- a display image parameter such that a subject is displayed in white when an image signal obtained by capturing a white subject as it is as a white subject is displayed.
- the value of (display condition) that is, a set value that is displayed on the display 17 while the subject is imaged by the camera 24 based on the camera image parameter (imaging condition) is used as the reference value.
- the change in the display condition is canceled and the value is changed to a value that is the same as or smaller in the image displayed when the display condition is the reference value.
- the imaging condition related to the display condition is changed.
- the display condition is set to a value different from the reference value, it is possible to display an image so that the same or a difference that the driver actually observed is seen.
- the imaging condition indicating how the camera captures the subject is changed, so image processing is simply performed on the image signal output from the camera. A clearer image can be displayed than the case.
- the display condition When the display condition is changed without having the reference value of the display condition, the display condition is changed according to the change amount of the display condition before and after the change, and the image is displayed with the display condition before the change. You may make it change the imaging condition relevant to the changed display conditions to the value which becomes the same or a difference small image.
- FIG. 8 is a correspondence diagram showing the relationship between camera image parameters and display image parameters. There is the following correspondence.
- (Display image parameter) ⁇ (Camera image parameter) (B1) Automatic color adjustment information ⁇ (E1) AWB set value (B2) White peak control information ⁇ (E3) AGC setting information, (E4) BLC setting information, (C9) Black and white level adjustment information (A1) Gamma curve adjustment information ⁇ (C1) Gamma curve adjustment information (A2) Noise compression adjustment information ⁇ (C2) Filter processing switching information (A3) Color outline correction information ⁇ (C3) Outline enhancement step number switching information (A4) Luminance contour correction information ⁇ (C3) Contour emphasis step number switching information (A5) HUE adjustment information ⁇ (C4) HUE adjustment information (A6) Saturation adjustment information ⁇ (C5) Saturation adjustment information (A7) Contrast adjustment information ⁇ (C6) Contrast adjustment information (A8) Sharpness adjustment information ⁇ (C7) Sharpness adjustment information
- the change in the display image parameter (B3) backlight dimming information affects all items of the display image parameter and camera image parameter except (B3) backlight dimming information. Therefore, when the backlight dimming information is changed, it is desirable to change the entire display image parameter excluding the backlight dimming information and the entire camera image parameter, but in particular, as in the first embodiment. Only parameters that have a large influence may be changed.
- the difference amount with respect to the reference value of the display image parameter is obtained, and the value changed according to the difference amount is used as the camera image parameter (imaging condition). Since it is set, information that cannot be included in the image signal with the camera image parameters that were originally set can be included in the image signal, and the subject can be reproduced more faithfully on the display.
- FIG. Embodiment 3 is a case where the imaging condition corresponding to the display condition is determined by the camera unit 2b (imaging device).
- FIG. 9 is a block diagram illustrating a configuration of a camera system according to Embodiment 3. Components that are the same as or correspond to those in FIG. 1 are given the same reference numerals, and descriptions thereof are omitted.
- the host unit 1b sends information (the difference between the changed parameter and its reference value) regarding the changed display image parameter (display condition) extracted by the change extraction unit 13 to the camera unit 2b (imaging device). Create a communication command to send to).
- the camera unit 2b includes a camera image parameter adjustment unit 23b (an imaging condition determining unit and an imaging condition changing unit).
- the camera image parameter adjusting unit 23b acquires the display image parameter changed from the communication command received by the communication command receiving unit 22 and the difference amount thereof, determines the camera image parameter according to the difference amount, and sets the camera image to the determined value. Change the camera image parameters stored in the parameter storage unit 21
- the camera system according to the third embodiment operates in substantially the same manner as in the first embodiment.
- the difference is that information related to the change of the display image parameter is sent from the host unit 1b to the camera unit 2b, and the camera image parameter corresponding to the display image parameter after the change is changed in the camera unit 2b based on the sent information. It is a point to decide.
- the amount of change before and after the change may be sent instead of the amount of difference from the reference value.
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Abstract
Description
図1は、実施の形態1に係るカメラシステムの構成を示すブロック図である。本実施の形態に係るカメラシステムは車両に搭載される車載用カメラシステムである。図1において、カメラシステム(撮像システム)は、車内に設置されたホストユニット1(表示装置)、および当該ホストユニット1と接続され車両の周囲を撮像するカメラユニット2(撮像装置)とを含んで構成されている。カメラシステムは、車両の周囲をカメラユニット2が撮像し、撮像された車両の周囲の画像をホストユニット1が表示することにより、運転手に車両の周囲の状況を確認させるものである。電子制御ユニット3は、一般に車両に搭載されているECU(Electric Control Unit)であり、車両に搭載されている各種計測機器の計測値を検出し、車両情報として出力するものである。ホストユニット1は電子制御ユニット3から出力される車両情報を利用して、処理を行う。
(A1) ガンマカーブ調整情報。
(A2) ノイズ圧縮調整情報。
(A3) 色輪郭補正情報。
(A4) 輝度輪郭補正情報。
(A5) HUE(色相)調整情報。
(A6) 彩度調整情報。
(A7) コントラスト調整情報。
(A8) シャープネス調整情報。
(B1) 自動色調整(Automatic Color Control)情報。入力信号の強度によらず色信号の強度を一定に保つようにするため情報。
(B2) 白ピーク制御(White Peak Control)情報。入力信号の強度によらず輝度信号の強度を一定に保つようにするための情報。
(B3) バックライト調光情報(発光量情報)。バックライト175の発光量を表す情報。
(B4) LCDパネル174のドットサイズ情報(解像度情報)。
(B5) ディスプレイ17のフレームレート情報。
(B6) 色空間情報。ディスプレイ17で表示できる色の範囲を表す情報。
(C1) ガンマカーブ調整情報。
(C2) フィルタ処理切り替え情報。
(C3) 輪郭強調段数切り替え情報。
(C4) HUE(色相)調整情報。
(C5) 彩度調整情報。
(C6) コントラスト調整情報。
(C7) シャープネス調整情報。
(C8) シェーディング調整情報。
(C9) 白黒レベル調整情報。
(D1) カメラのオート機能の情報。
(D2) カメラの撮像画面サイズ情報、
(D3) カメラの撮像フレームレート情報。
(カメラのオート機能の情報)
(E1) AE(自動露光)設定情報。露光エリアや、収束の明るさ、収束の明るさへの時間的変化などのパラメータが含まれる。
(E2) AWB(自動白バランス)設定情報。バランスエリアや、収束の色空間、収束の色空間への時間的変化などのパラメータが含まれる。
(E3) AGC(オートゲインコントロール)設定情報。
(E4) BLC(ブラックレベルコントロール)設定情報。
例えば、日が沈んで車両の周囲が暗くなってくると、日中と同じ輝度で画像を表示すると、ディスプレイ17に表示される画像が運転者にはまぶしく感じられる。そこで、このように車両の周囲が暗くなった場合、ディスプレイ17に表示される画像を暗くするようにしている。本実施の形態にかかるカメラシステムでは、車両の周囲が暗くなったことを電子制御ユニット3から出力されるILL信号を用いて判断している。ILL信号とは、運転者がライトスイッチを操作してランプを点灯させたときに、ライトスイッチが操作されたことを検出した電子制御ユニット3から出力される、車両に搭載されたランプを点灯させたことを示す信号のことである。車両の運転者は、車両の周囲が暗くなるとライトスイッチを操作して車両に搭載されたランプを点灯させるため、このILL信号を検出することにより車両の周囲が暗くなったことを検出することができる。なお、ILL信号は、車両に搭載されたランプを点灯させたことを示す場合には、ONの状態になっている。
以上のことは、他の実施の形態にもあてはまる。
車両の周囲をカメラにより撮像し車内に設けられたディスプレイに車両の周囲の状況を表示する運転支援装置などの装置においては、ディスプレイには、運転者が実際に目視したのと同じように見えるように、被写体が表示されることが望ましい。例えば、ディスプレイ画像パラメータの(B1)自動色調整情報は色調に係る情報であるが、この情報を変更することにより同じ画像信号のディスプレイ17で表示される色が変化する。例えば、運転者が(B1)自動色調整情報をディスプレイ17がやや赤っぽく表示するように調整している場合、画像信号をそのまま表示すると白の被写体が赤っぽい白として表示される。そこで、本実施の形態に係るカメラシステムにおいては、赤っぽく表示するように(B1)自動色調整情報が設定されている場合に、カメラユニット2において白の被写体を青っぽい白になるように撮像することにより、白い被写体を白くディスプレイ17に表示させる。図7は、実施の形態2に係るカメラシステムの構成を示すブロック図である。図1と同一または対応する構成については、同一の符号を付し、説明を省略する。
(B1)自動色調整情報 ⇔ (E1)AWB設定値
(B2)白ピーク制御情報 ⇔ (E3)AGC設定情報、(E4)BLC設定情報、
(C9)白黒レベル調整情報
(A1)ガンマカーブ調整情報 ⇔ (C1)ガンマカーブ調整情報
(A2)ノイズ圧縮調整情報 ⇔ (C2)フィルタ処理切り替え情報
(A3)色輪郭補正情報 ⇔ (C3)輪郭強調段数切り替え情報
(A4)輝度輪郭補正情報 ⇔ (C3)輪郭強調段数切り替え情報
(A5)HUE調整情報 ⇔ (C4)HUE調整情報
(A6)彩度調整情報 ⇔ (C5)彩度調整情報
(A7)コントラスト調整情報 ⇔ (C6)コントラスト調整情報
(A8)シャープネス調整情報 ⇔ (C7)シャープネス調整情報
実施の形態3は、表示条件に対応する撮像条件をカメラユニット2b(撮像装置)で決めるようにした場合である。図9は、実施の形態3に係るカメラシステムの構成を示すブロック図である。図1と同一または対応する構成については、同一の符号を付し、説明を省略する。
ディスプレイ画像パラメータの変化に関する情報として、基準値との差異量ではなく、変化前後での変化量を送ってもよい。
11 ディスプレイ画像パラメータ格納部(表示条件記憶部)
12,12a ディスプレイ画像パラメータ変更部(表示条件変更部)
13 変化抽出部(撮像条件決定部)
14,14a 通信コマンド生成部(撮像条件決定部)
14b 通信コマンド生成部
15 通信コマンド送信部
16 画像信号受信部
17 ディスプレイ(表示部)
18 通信部
2,2b カメラユニット(撮像装置)
21 カメラ画像パラメータ格納部(撮像条件記憶部)
22 通信コマンド受信部
23 カメラ画像パラメータ調整部(撮像条件変更部)
23b カメラ画像パラメータ調整部(撮像条件決定部、撮像条件変更部)
24 カメラ(撮像部)
25 画像信号送信部
26 通信部
27 映像信号送信部
Claims (12)
- 撮像に関する設定値である撮像条件を記憶する撮像条件記憶部、前記撮像条件記憶部に記憶された前記撮像条件にしたがって被写体を撮像し画像信号を生成する撮像部、前記画像信号を表示する表示装置と通信する通信部、前記通信部が受信した情報に基づいて前記撮像条件記憶部に記憶された前記撮像条件を変更する撮像条件変更部を有する撮像装置と、
前記撮像装置と通信する通信部、表示に関する設定値である表示条件を記憶する表示条件記憶部、前記通信部が受信した前記画像信号を前記表示条件記憶部に記憶された前記表示条件にしたがって表示する表示部、前記表示条件記憶部に記憶された前記表示条件を変更する表示条件変更部を有する表示装置と、
前記表示条件に対応した前記撮像条件を決める撮像条件決定部とを備え、
前記表示装置において、前記表示条件変更部により前記表示条件記憶部に記憶された前記表示条件が変更された場合に、前記撮像条件決定部が変更後の前記表示条件に対応した前記撮像条件を決め、前記撮像装置において、前記撮像条件決定部が決めた前記撮像条件に前記撮像条件変更部が前記撮像条件記憶部が記憶する前記撮像条件を変更することを特徴とする撮像システム。 - 前記表示条件変更部が前記表示部の発光量を減少させるように前記表示条件記憶部に記憶された前記表示条件を変更した場合に、前記撮像条件決定部が、前記撮像部が撮像する輝度範囲の上限が小さくなるように前記撮像条件を決定し、
前記表示条件変更部が前記表示部の発光量を増加させるように前記表示条件記憶部に記憶された前記表示条件を変更した場合に、前記撮像条件決定部が、前記撮像部が撮像する輝度範囲の上限が大きくなるように前記撮像条件を決定することを特徴とする請求項1に記載の撮像システム。 - 前記撮像装置および前記表示装置は車両に取り付けられ、
前記車両に設けられたランプの点灯または消灯を示す点灯信号を取得する点灯信号取得部を備え、
前記点灯信号取得部が取得した前記点灯信号が前記表示条件変更部に入力され、
前記表示条件変更部が、点灯を示す前記点灯信号が入力された場合に、前記表示部の発光量を減少させるように前記表示条件記憶部に記憶された前記表示条件を変更し、消灯を示す前記点灯信号が入力された場合に、前記表示部の発光量を増加させるように前記表示条件記憶部に記憶された前記表示条件を変更することを特徴とする請求項2に記載の撮像システム。 - 前記表示条件変更部が、現在時刻に基づいて、前記表示部の発光量を減少または増加させるように前記表示条件記憶部に記憶された前記表示条件を変更することを特徴とする請求項2に記載の撮像システム。
- 前記表示条件変更部は、現在の日時と前記車両の位置に基づいて、前記表示部の発光量を減少または増加させるように前記表示条件記憶部に記憶された前記表示条件を変更することを特徴とする請求項2に記載の撮像システム。
- 前記表示条件変更部は、現在の日時と前記車両の位置および走行方向に基づいて、前記表示部の発光量を減少または増加させるように前記表示条件記憶部に記憶された前記表示条件を変更することを特徴とする請求項2に記載の撮像システム。
- 前記表示条件変更部は、前記表示装置の周囲の照度に基づいて、前記表示部の発光量を減少または増加させるように前記表示条件記憶部に記憶された前記表示条件を変更することを特徴とする請求項2に記載の撮像システム。
- 前記表示部は、光源としてのバックライトと前記バックライトから出力される光により画像を表示する画像表示素子とを有し、
前記表示条件変更部は、前記画像表示素子の種類を示すパネル情報を前記画像表示素子から取得し、前記パネル情報に基づいて、前記表示条件を変更することを特徴とする請求項1ないし請求項7のいずれかに記載の撮像システム。 - 前記表示装置が、前記表示条件の基準値を記憶する前記基準表示条件記憶部を有し、
前記撮像条件決定部が、前記基準表示条件記憶部に前記表示条件の基準値が記憶されている場合に前記表示部に表示される画像と同じまたは差が小さい画像が前記表示部に表示されるように、前記基準表示条件記憶部に記憶された前記表示条件の基準値と前記表示条件記憶部に記憶された前記表示条件との差異量に基づき、前記撮像条件を決めることを特徴とする請求項1に記載の撮像システム。 - 前記撮像条件決定部が、前記表示条件の変更前に前記表示部に表示される画像と同じまたは差が小さい画像が前記表示部に表示されるように、前記表示条件の変化量に基づき、前記撮像条件を決めることを特徴とする請求項1に記載の撮像システム。
- 表示に関する設定値である表示条件にしたがって画像を表示し、前記表示条件を外部に出力する表示装置と接続される撮像装置であって、
撮像に関する設定値である撮像条件を記憶する撮像条件記憶部と、
前記撮像条件記憶部に記憶された前記撮像条件にしたがって被写体を撮像し画像信号を生成する撮像部と、
前記画像信号を前記表示装置に出力し、前記表示装置から送られる前記表示条件を受信する通信部と、
前記通信部が受信した前記表示条件に対応した前記撮像条件を決める撮像条件決定部と、
前記撮像条件決定部が決めた前記撮像条件に前記撮像条件記憶部が記憶する前記撮像条件を変更する前記撮像条件変更部とを備えた撮像装置。 - 撮像に関する設定値である撮像条件にしたがって撮像し、前記撮像条件が外部から変更できる撮像装置と接続される表示装置であって、
表示に関する設定値である表示条件を記憶する表示条件記憶部と、
前記撮像装置が撮像した画像を前記表示条件記憶部に記憶された前記表示条件にしたがって表示する表示部と、
前記表示条件記憶部に記憶された前記表示条件を変更する表示条件変更部と、
前記表示条件に対応した前記撮像条件を決める撮像条件決定部と、
前記撮像装置と通信する通信部とを備え、
前記表示条件変更部により前記表示条件記憶部に記憶された前記表示条件が変更された場合に、前記撮像条件決定部が変更後の前記表示条件に対応した前記撮像条件を決め、決められた前記撮像条件を前記通信部により前記撮像装置に送信することを特徴とする表示装置。
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- 2010-06-09 JP JP2012519139A patent/JP5173083B2/ja not_active Expired - Fee Related
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US20130057723A1 (en) | 2013-03-07 |
JPWO2011154997A1 (ja) | 2013-08-01 |
DE112010005650T5 (de) | 2013-03-28 |
DE112010005650B4 (de) | 2014-01-30 |
US9019417B2 (en) | 2015-04-28 |
JP5173083B2 (ja) | 2013-03-27 |
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