JP2014207515A - On-vehicle camera system, and imaging method for on-vehicle camera system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an on-vehicle camera system, which images the rear direction by a camera using power source power supplied from a battery and outputs an imaged picture, and appropriately provide the picture of the rear direction while suppressing power consumption in the battery.SOLUTION: An imaged signal transmission device (1A) comprises: an imaging unit (11) for imaging a picture around a vehicle; a communication unit (103) for transmitting the picture imaged by the imaging unit; a stop detection unit (108) for detecting stop of the vehicle; a calculation unit (105) for calculating speed of the vehicle and a turning angle of a steering wheel of the vehicle; a storage unit (109) for storing a history of the speed of the vehicle and turning angle of the steering wheel calculated by the calculation unit in a predetermined period; and a control unit (105) for making operation of the communication unit start according to stop detection by the stop detection unit, and making operation of the imaging unit start when the maximum value of the speed in the predetermined period is smaller than a speed threshold and the maximum value of the turning angle of the steering wheel in the predetermined period is larger than a turning angle threshold.

Description

  The present invention relates to an in-vehicle camera system that images the rear of a vehicle and outputs the image, and an imaging method in the in-vehicle camera system.

When driving a vehicle, an in-vehicle camera system is used in which a part that becomes a blind spot of a driver is captured by a camera and the image is displayed on a monitor provided in a driver's seat. In particular, when a vehicle is parked, an in-vehicle camera is often installed at the rear of the vehicle in order to capture a blind spot behind the vehicle.
By the way, it is necessary to connect a cable to the camera for signal transmission, operation control, power supply, etc. When the camera is installed behind the vehicle, the cable is routed to the driver's seat at the front of the vehicle That is, the installation work is not easy. In order to eliminate such cable routing work, a technique for performing wireless communication between a camera and a display device has also been proposed (see, for example, Patent Document 1).

JP 2001-301538 A

  If the camera is equipped with a battery and a communication unit and wireless communication is performed between the camera and the display device, the installation work is easy because there is no need to route the cable. However, if an image is always captured and transmitted with such a configuration, the battery power is always consumed, so that the battery is quickly consumed. On the other hand, if the camera is configured to be manually activated, the camera image cannot be viewed immediately when necessary. As described above, the conventional technique has a problem in that the battery is quickly consumed when the rear image of the vehicle is provided so that it can be seen immediately when necessary.

  Therefore, the problem to be solved by the present invention is to exhaust the battery of the in-vehicle camera system that captures the rear of the vehicle with a camera supplied with power from the battery, transmits the image wirelessly, and receives and outputs the image. An object of the present invention is to provide a technology that can appropriately provide an image of the rear of a vehicle while suppressing the above-described problem.

In order to solve the above problems, the present invention provides the following apparatus and method.
1) an imaging unit (11) that captures an image around the vehicle, a communication unit (103) that transmits an image captured by the imaging unit, a stop detection unit (105) that detects the stop of the vehicle, and the speed of the vehicle And a calculation unit (105) for calculating the vehicle steering angle, and a storage unit (109) for storing a history of a predetermined period between the vehicle speed calculated by the calculation unit and the steering angle calculated by the calculation unit. ) And the operation of the communication unit is started in response to the detection of the stop of the stop detection unit, and the maximum value of the speed for a predetermined period stored in the storage unit is smaller than the speed threshold value and stored in the storage unit And a control unit (105) for starting the operation of the imaging unit when the maximum value of the steering angle of the handle during the period is larger than the threshold value.
2) The imaging signal transmission device according to 1), wherein the control unit of the imaging signal transmission device starts operation by starting supply of power.
3) The imaging signal transmission device (1A) according to 1) or 2), a communication unit (201) that receives an image transmitted from the imaging signal transmission device, and an image output unit that outputs an image received by the communication unit (203), a hazard detection unit (204) that detects lighting of the hazard lamp of the vehicle, and an instruction to start imaging from the communication unit to the imaging signal transmission device in response to detection of lighting of the hazard lamp of the hazard detection unit An in-vehicle camera system including an imaging signal receiving device including a control unit (201), wherein the control unit of the imaging signal transmitting device further responds to an imaging start instruction from a communication unit of the imaging signal receiving device. An in-vehicle camera system characterized by starting the operation of the vehicle.
4) Stop detection step (S606) for detecting the stop of the vehicle, a calculation step for calculating the vehicle speed and the steering angle of the vehicle handle, a vehicle speed calculated by the calculation unit, and a handle for calculation by the calculation unit. The storage step (S601, S602) for storing the history of the predetermined period with the turning angle in the storage unit and the stop detection step detect the stop, and the maximum value of the speed for the predetermined period stored in the storage step is increased. A captured image output that outputs an image of the surrounding image of the vehicle when the maximum value of the steering angle of the steering wheel for a predetermined period stored in the storing step is smaller than the threshold value and larger than the threshold value And a step (S605). An imaging method in an in-vehicle camera system.
5) The imaging method further includes a hazard detection step (S704) for detecting the lighting of the hazard lamp of the vehicle. The captured image output step further detects the stop in the stop detection step, and detects the lighting of the hazard lamp in the hazard detection step. 4. The imaging method according to 4), wherein an image obtained by capturing an image around the vehicle is sometimes output.

  ADVANTAGE OF THE INVENTION According to this invention, the image of the back of a vehicle can be provided appropriately, suppressing battery consumption.

It is a block block diagram of the imaging signal transmission apparatus in 1st Example of the vehicle-mounted camera system of this invention. It is a block block diagram of the imaging signal receiver in 1st Example of the vehicle-mounted camera system of this invention. It is a side view which shows the vehicle which mounted the vehicle-mounted camera system of the 1st and 2nd Example of this invention. It is a schematic diagram which shows the 1st example of the driving operation at the time of parking of a vehicle. It is a schematic diagram which shows the 2nd example of the driving operation at the time of parking of a vehicle. It is a flowchart which shows the outline | summary of control of the imaging signal transmission apparatus in 1st Example of the vehicle-mounted camera system of this invention. It is a flowchart which shows the outline | summary of control of the imaging signal receiver in 1st Example of the vehicle-mounted camera system of this invention. It is a block block diagram of the imaging signal transmission apparatus in 2nd Example of the vehicle-mounted camera system of this invention. It is a block block diagram of the imaging signal receiver in 2nd Example of the vehicle-mounted camera system of this invention. It is a flowchart which shows the outline | summary of the control in 2nd Example of the vehicle-mounted camera system of this invention.

Hereinafter, an embodiment of an in-vehicle camera system according to the present invention will be described based on examples with reference to the accompanying drawings. However, the components, types, combinations, shapes, relative arrangements, and the like described in this embodiment are merely illustrative examples and not intended to limit the scope of the present invention only unless otherwise specified. . In addition, the same parts and the same matters as those already described are denoted by the same reference numerals and numbers, and redundant description is omitted.
The in-vehicle camera system of this embodiment includes an imaging signal transmission device and an imaging signal reception device.
[First embodiment]
[Configuration of imaging signal transmitter]

FIG. 1 is a block diagram of the imaging signal transmission apparatus 1A. The power supply unit 104 of the transmission unit 10 is a battery, for example, a lithium ion rechargeable battery. The power supply unit 106 supplies power supplied from the power supply unit 104 as power supply power for the signal processing unit 102 and the communication unit 103, and also supplies power from the power output unit 107 to the camera 11. It is assumed that the power supply unit 104 directly supplies power to the other units of the transmission unit 10. The camera 11 supplied with power from the power output unit 107 performs imaging. The camera 11 further outputs captured image data, for example, in a format defined by ITU-R (International Telecommunication Union Radiocommunications Sector) BT656, which is a serial digital interface standard. The camera 11 sends the output image data to the image input unit 101 of the transmission unit 10. The image input unit 101 sends the image data sent from the camera 11 to the signal processing unit 102. When the power supply is supplied from the power supply unit 106, the signal processing unit 102 compresses the image data using a method such as JPEG (Joint Picture Expert Group) or MPEG (Motion Picture Expert Group) -4, and the communication unit. 103. When power is supplied from the power supply unit 106, the communication unit 103 establishes communication with a communication unit 201 of the receiving unit 20 described later. Then, in accordance with the transmission timing, the compressed image data is transmitted by a wireless method defined by, for example, IEEE (Institute of Electrical and Electronic Engineers) 802.11g. The communication unit 103 also receives a control signal from the receiving unit 20 described later and sends it to the control unit 105.
The control unit 105 includes a CPU (Central Processing Unit) and the like, and controls the power supply unit 106 in accordance with a control signal from the receiving unit 20 described later. Details of the control of the control unit 105 will be described later.
The acceleration sensor 108 detects the acceleration of the vehicle and sends acceleration data to the control unit 105. The control unit 105 can detect forward, backward, and stop of the vehicle from the acceleration data.
The storage unit 109 stores the speed of the vehicle and the turning angle of the steering wheel as will be described later.
[Configuration of imaging signal receiver]

FIG. 2 is a block diagram of the imaging signal receiving device 2A in the in-vehicle camera system of the first embodiment. The communication unit 201 of the receiving unit 20 receives image data transmitted from the communication unit 103 of the transmitting unit 10 by wireless communication. Receive. The communication unit 201 also transmits a control signal generated by the control unit 204 to the transmission unit 10 as described later.
The signal processing unit 202 decodes the image data received by the communication unit 201 and sends it to the image output unit 203. The image output unit 203 outputs the image data sent from the signal processing unit 202. A monitor 21 is connected to the image output unit 203, and image data output from the receiving unit 20 is displayed on the monitor 21. As a result, the rear image of the vehicle imaged by the camera 11 is displayed on the monitor 21. In addition, the receiving unit 20 and the monitor 21 are supplied with power from a battery of a vehicle body (not shown).

The receiving unit 20 also includes an acceleration sensor 205 and an orientation sensor 206. Outputs from the acceleration sensor 205 and the orientation sensor 206 are sent to the control unit 204. Details of the acceleration sensor 205 and the orientation sensor 206 will be described later.
The receiving unit 20 is provided with a shift lever position input unit 207 and a hazard switch input unit 208. A signal corresponding to the position of the shift lever is input to the shift lever position input unit 207 as described later. The output of the shift lever position input from the shift lever position input unit 207 is sent to the control unit 204. A hazard switch signal is input to the hazard switch input unit 208. A signal input to the hazard switch input unit 208 is sent to the control unit 204.
[Vehicle composition]

FIG. 3 is a side view showing an example of a vehicle equipped with the in-vehicle camera system of the first embodiment. The vehicle 3A includes a rear hatchback 31 and a driver seat 32 for the driver to drive the vehicle 3A.
A shift lever 33 for moving the vehicle 3A forward and backward, an accelerator pedal 34, and a steering wheel 35 for steering are provided in the vicinity of the driver's seat 32 of the vehicle 3A. Although not shown, the shift lever 33 is provided with a shift lever position detector that detects the operation position of the shift lever 33 and outputs the operation position data. The accelerator pedal 34 detects the angle of the accelerator pedal 34 (not shown). An accelerator pedal angle detector that outputs angle data is provided.

The operation position data output from the shift lever position detector and the angle data output from the accelerator pedal angle detector are sent to a drive control unit (not shown). The drive control unit operates a transmission (not shown) according to the operation position of the shift lever 33 and the angle of the accelerator pedal 34, or outputs a speed signal to an engine (not shown) to drive the vehicle 3A. The output of the shift lever position detector is also sent to the shift lever position input unit 207 of the receiving unit 20 as described above.
A camera 11 is attached to the vehicle 3A in order to capture the rear of the vehicle 3A. The camera 11 can be attached at an arbitrary position that can be easily attached to the vehicle 3A, such as the camera 11a at the upper position of the rear hatchback 31 or the camera 11b at a position near the license plate. A transmission unit 10 is attached together with the camera 11.

A monitor 21 is attached in the vicinity of the driver's seat 32 of the vehicle 3A. The receiving unit 20 is provided in the vicinity of the monitor 21, the lower part of the driver's seat 32, and the like. Further, a hazard lamp 36 is provided in the vehicle 3A, and the hazard lamp 36 blinks when the driver operates a hazard switch (not shown) provided in the vicinity of the driver's seat 32.
[First example of driving operation when parking]

  Here, a first example of the driving operation of the vehicle when the vehicle is parked in the parking lot will be described. FIG. 4 is a conceptual diagram showing a first example of the driving operation of the vehicle when the vehicle is parked in the parking lot. FIG. 4 shows a driving operation of driving the vehicle 3A and parking in the parking space 41 of the parking lot. The parking space 41 is composed of white lines on both sides and a rear car stop.

  A state in which the vehicle 3A approaches the parking space 41 is shown in FIG. From this state, the driver turns the steering wheel to the right to move the vehicle 3A forward, and stops at a position where the vehicle can be back as shown in FIG.

  Next, the driver slowly turns the vehicle 3A back while confirming the safety of the rear part of the vehicle 3A. At this time, the driver checks the rear and left and right of the vehicle, uses the rearview mirror and the rearview mirror to check the safety of the surroundings, checks the position of the vehicle, and slowly backs up. The driver moves to the vicinity of the parking space 41 as shown in FIG. 4c) while adjusting the position by operating the steering wheel as necessary, or temporarily moving the vehicle back and moving the vehicle forward.

  When the driver moves to the vicinity of the parking space 41, the driver further operates the accelerator pedal 34 and the handle 35 to bring the vehicle back to a position that just fits in the parking space 41 as shown in FIG.

Finally, the driver puts the shift lever into the parking position, applies the parking brake, and completes parking.
[Second example of driving operation when parking]

  Next, a second example of the driving operation of the vehicle when the vehicle is parked in the parking lot will be described with reference to FIG.

  FIG. 5a) shows a state where the vehicle 3A has passed through the parking space 41 and has once stopped. In this state, the driver first operates the hazard switch to turn on (flash) the hazard lamp 36. Next, the driver turns the steering wheel to the left to bring the vehicle 3A back, and approaches the stop space 41 as shown in FIG.

  The driver further backs the vehicle 3A while confirming the safety of the rear part of the vehicle 3A. At this time, the driver checks the rear and left and right of the vehicle, uses the rearview mirror and the rearview mirror to check the safety of the surroundings, checks the position of the vehicle, and slowly backs up. The driver moves to the vicinity of the parking position as shown in FIG. 5c while operating the steering wheel to correct the position as necessary or stopping the back and moving the vehicle forward.

  When the vehicle moves to the vicinity of the parking position, the driver further operates the accelerator pedal 34 and the handle 35 to move the vehicle back to the position where it is just within the parking space 41 as shown in FIG.

Finally, the driver puts the shift lever into the parking position, applies the parking brake, turns off the hazard lamp 36, turns off the engine, and completes parking.
According to the applicant's investigation, when performing parking, a driving operation as shown in the first example or the second example is often performed, so that a rear image can be displayed according to these operations. Is preferred.
[Camera control procedure]

  Of the driving operations during parking shown in FIG. 4, in the state of FIG. 4 b), the driver of the vehicle 3 </ b> A starts to back next, so it is desirable to display a rear image.

  The control unit 105 of the transmission unit 10 performs control according to the flowchart of FIG. The control unit 105 always calculates the speed by integrating the acceleration in the forward / backward direction detected by the acceleration sensor 108, and stores the calculated speed in the storage unit 109 (step S601). It is assumed that the speed is stored in FIFO (First In First Out) for a predetermined period, for example, 5 seconds.

  Further, the control unit 105 calculates the steering angle (turning radius) of the steering wheel of the vehicle 3A by dividing the lateral acceleration detected by the acceleration sensor 108 by the speed in the forward / rearward direction. The calculated turning angle of the steering wheel is stored in the storage unit 109 as a FIFO in the same manner as the speed (step S602). The turning angle of the steering wheel may be calculated from the change rate of the direction detected by the direction sensor 206 and the speed.

  Then, the control unit 105 determines whether or not the vehicle 3A is backing from the output of the acceleration sensor 108 (step S603). If it is determined that the power is back, the control unit 105 supplies power from the power supply unit 106 to the communication unit 103 to activate the communication unit 103, and establishes communication with the receiving unit 20 (step S604). Then, power supply power is supplied from the power output unit 107 to activate the camera 11, and power supply power is supplied from the power supply unit 106 to the signal processing unit 102 to activate the signal processing unit 102. Accordingly, the rear image is captured by the camera 11, the signal processing unit 102 performs compression, and the communication unit 103 transmits the compressed image signal (step S605). The receiving unit 20 can receive an image of the rear part of the vehicle 3 </ b> A and display it on the monitor 21.

If it is determined that the control unit 105 is not back (NO in step S603), it is next determined whether or not the output is stopped from the acceleration sensor 108 (step S606). If it is determined that the communication is stopped, the communication unit 103 is also activated to establish communication with the receiving unit 20 (step S607).
Then, the control unit 105 reads the speed stored in the storage unit 109 and confirms whether or not the maximum speed for a predetermined period until the stop is lower than a predetermined speed threshold value (step S608). The predetermined speed threshold value is an upper limit speed at which the vehicle slowly moves forward in the parking lot, for example, 20 km / h. When the maximum speed is lower than the speed threshold, the control unit 105 next reads the steering angle of the handle stored in the storage unit 109, and the maximum cutting angle for a predetermined period until stopping is a predetermined cutting angle. It is confirmed whether it is larger than the threshold value (step S609). The predetermined turning angle threshold is a lower turning angle when the steering wheel is largely turned in the parking lot.

  When the maximum turning angle is larger than the predetermined turning angle threshold, the control unit 105 determines that the probability that the back is performed next is high, and proceeds to step S605 to start imaging and transmission. As shown in the first example of the driving operation described above, when parking, the vehicle is often turned slowly by turning the steering wheel and stopping once. Therefore, if the forward speed immediately before stopping is slow and the steering angle of the steering wheel is large, it can be determined that the probability of performing the next back is high. If the camera image is displayed at this timing, safety can be confirmed at an early stage. Even if it takes time to start the camera, it can be displayed before the camera backs up.

  If the maximum speed is greater than or equal to the speed threshold value in step S608 (NO in step S608), and if the maximum turning angle is less than or equal to the turning angle threshold value in step S609 (NO in step S609), the control unit 105 receives the receiving unit 20. It is confirmed whether there is an instruction to start the camera from (step S610). The procedure for instructing the camera to be activated by the receiving unit 20 will be described later. If there is an activation instruction from the receiving unit 20, the control unit 105 proceeds to step S605 and starts imaging and transmission. If there is no activation instruction, the process returns to step S603. As described above, if communication is established when the communication is stopped, power consumption due to unnecessary communication can be suppressed, and an image of the camera 11 can be displayed immediately when necessary.

  On the other hand, the control unit 204 of the receiving unit 20 performs control according to the flowchart of FIG. The control unit 204 confirms whether or not the signal input to the shift lever position input unit 207 is back (step S701), and if it is back, instructs the transmission unit 10 to start (step S702). If it is not the back, the control unit 204 checks whether or not the signal input to the shift lever position input unit 207 is stopped (step S703). When it is a stop, the control part 204 next checks the signal of the hazard switch input part 208, and confirms whether the hazard lamp 36 is lit (step S704). If the hazard lamp 36 is lit, the process proceeds to step S702, and the transmission unit 10 is instructed to start transmission. If it is not stopped in step S703, or if the hazard lamp is not lit in step S704, the process returns to step S701.

  As shown in the second example of the driving operation described above, when parking, it is often performed to signal the surroundings by turning on the hazard lamp 36. Therefore, if the hazard lamp 36 is lit when the vehicle stops, it can be determined that the probability of performing the next back is high. If the camera image is displayed at this timing, safety can be confirmed at an early stage. Even if it takes time to start the camera, it can be displayed before the camera backs up.

The confirmation of the maximum speed (step S606) and the confirmation of the maximum turning angle (step S607) may be performed by the reception unit 20 instead of the transmission unit 10. In that case, the control unit 204 calculates the speed from the acceleration sensor 205 of the receiving unit 20 or acquires the speed from the vehicle and stores it in a storage unit (not shown) provided in the receiving unit 20. Further, the turning angle is calculated from the acceleration sensor 205 of the receiving unit 20 and stored in the storage unit provided in the receiving unit 20. If the maximum speed is equal to or less than the speed threshold and the maximum turning angle is equal to or more than the turning angle threshold when the operation is stopped, an instruction to start the camera is issued from the communication unit 201 of the receiving unit 20.
[Second Embodiment]

  Next, in an in-vehicle camera system that performs wired communication between the imaging signal transmission device and the imaging signal reception device and supplies the power of the imaging signal transmission device from the vehicle battery, the timing for displaying the camera image is controlled. An example of this will be described as a second embodiment.

The conventional in-vehicle camera system displays a camera image when the shift lever is in the back. However, when the shift lever is in the back, the vehicle is ready to back. Originally, it is desirable to confirm safety before the vehicle moves.
Also, when the shift lever is in the back, the back lamp lights up, which can surprise you if there are people around the vehicle.

Therefore, the in-vehicle camera system of the present embodiment displays an image of the in-vehicle camera before the shift lever is turned back so that the safety around the vehicle can be confirmed at an early stage.
[Configuration of Imaging Signal Transmitter of Second Embodiment]

FIG. 8 is a block diagram of an in-vehicle camera 80 which is an image pickup signal transmission apparatus in the second embodiment. In the in-vehicle camera 80, power is supplied from the battery of the vehicle 3A to the power input unit 801 of the in-vehicle camera 80. The in-vehicle camera 80 includes a camera unit 802, and the camera unit 802 supplied with power from the power input 801 performs imaging. The image output unit 803 outputs an image captured by the camera unit 802 through a cable routed inside the vehicle 3A.
[Configuration of Imaging Signal Receiving Device in Second Embodiment]

  FIG. 9 is a block diagram of the imaging signal receiving device 9A in the in-vehicle camera system of the second embodiment. The image input unit 901 of the receiving unit 90 is image data output from the image output unit 803 of the in-vehicle camera 80 through a cable. Enter. An image input from the image input unit 901 passes through the image switching unit 902 and is sent to the image output unit 903. The image switching unit 902 outputs to the image output unit 903 input to the image input unit 901 in response to an instruction from the control unit 904. The control unit 904 always integrates the acceleration in the forward / backward direction detected by the acceleration sensor 205 to calculate the speed, and stores the calculated speed in the storage unit 905 using the FIFO method.

In addition, the control unit 904 stores the steering angle of the handle in the storage unit 905 using the FIFO as well as the speed. The steering angle of the steering wheel may be calculated from the direction change rate detected by the direction sensor 206 and the speed.
[Camera Control Procedure in Second Embodiment]

  The control unit 904 of the receiving unit 90 performs control according to the flowchart of FIG. The control unit 904 always calculates the speed by integrating the acceleration in the forward / backward direction detected by the acceleration sensor 205, and stores the calculated speed in the storage unit 905 (step S1001). It is assumed that the speed is stored in a FIFO for a predetermined period, for example, 5 seconds.

  In addition, the control unit 904 calculates the steering angle of the steering wheel of the vehicle 3A by dividing the lateral acceleration detected by the acceleration sensor 205 by the speed in the forward / rearward direction, and stores it in the storage unit 109 by FIFO ( Step S1002).

Next, the control unit 904 determines whether or not the gear is in reverse from the signal input to the shift lever position input unit 207 (step S1003). If it is determined that the back is set, the control unit 904 sends an instruction to the image switching unit 902, and causes the image output unit 903 to output the image of the in-vehicle camera 80 (step S1004). Thereby, the receiving unit 90 can display the image of the rear part of the vehicle 3 </ b> A on the monitor 21.

When the control unit 904 determines that the vehicle is not back (NO in step S1003), the control unit 904 next determines from the output of the acceleration sensor 205 whether the vehicle is stopped (step S1005). If it is determined that the vehicle has stopped, the control unit 904 reads the speed stored in the storage unit 905 and checks whether the maximum speed during a predetermined period until the stop is lower than a predetermined speed threshold. (Step S1006). When the maximum speed is lower than the speed threshold value, the control unit 904 next reads the steering angle of the handle stored in the storage unit 905, and the maximum angular angle for a predetermined period until stopping is the predetermined angular angle. It is confirmed whether it is larger than the threshold value (step S1007).
If the maximum turning angle is larger than the predetermined turning angle threshold, the control unit 904 determines that the probability of the next back is high, proceeds to step S1004, and outputs the image of the in-vehicle camera 80.

  If the maximum speed is greater than or equal to the speed threshold value in step S1005, or if the maximum turning angle is less than or equal to the turning angle threshold value in step S1006, the control unit 904 determines the hazard lamp Whether or not is lit is checked (step S1008). If the hazard lamp is lit, the process proceeds to step S1004, and the image of the in-vehicle camera 80 is output. If not stopped in step S1005, or if the hazard lamp is not lit in step S1008, the process returns to step S1003.

  By configuring as described above, the in-vehicle camera system of the second embodiment can display the image of the in-vehicle camera before putting the shift lever in the back. Thereby, safety can be confirmed earlier. Even if it takes time to switch images. You can display before you back. In addition, since the rear image can be displayed before the back lamp is lit, there is no surprise even if there are people around the vehicle.

  The imaging signal receiving device of the present embodiment may be configured integrally with the navigation system, and the acceleration sensor, direction sensor, and monitor of the navigation system may be shared.

  Further, the imaging signal receiving device of the present embodiment may be realized by a smartphone and application software installed in the smartphone. In that case, since the shift lever position input unit and the hazard switch input unit are omitted, the activation instruction by the imaging signal receiving device in step S610 is not performed. Or you may comprise so that a starting instruction | indication may be performed by manual operation.

1A Imaging Signal Transmitting Device 10 Transmission Unit 101 Input Unit 102 Signal Processing Unit 103 Communication Unit 104 Power Supply Unit 105 Control Unit 106 Power Supply Unit 107 Power Output Unit 11 Camera

Claims (5)

An imaging unit that captures an image around the vehicle;
A communication unit that transmits an image captured by the imaging unit;
A stop detection unit for detecting the stop of the vehicle,
A calculation unit for calculating the speed of the vehicle and the turning angle of the steering wheel of the vehicle,
A storage unit for storing a history of a predetermined period between a vehicle speed calculated by the calculation unit and a steering angle calculated by the calculation unit;
The operation of the communication unit is started in response to detection of the stop of the stop detection unit, and the maximum speed value stored in the storage unit for a predetermined period is smaller than the speed threshold value and stored in the storage unit An imaging signal transmitting apparatus comprising: a control unit that starts an operation of the imaging unit when a maximum value of the steering angle of the handle for a predetermined period is larger than a threshold angle threshold. The control unit of the imaging signal transmission device includes:
The imaging signal transmitting apparatus according to claim 1, wherein the operation is started by starting supply of power. The imaging signal transmission device according to claim 1 or 2,
A communication unit that receives an image transmitted from the imaging signal transmission device, an image output unit that outputs an image received by the communication unit, a hazard detection unit that detects lighting of a hazard lamp of a vehicle, and the hazard detection unit An in-vehicle camera system including an imaging signal receiving device including a control unit that sends an imaging start instruction from the communication unit to the imaging signal transmitting device in response to detection of lighting of the hazard lamp,
The vehicle-mounted camera system, wherein the control unit of the imaging signal transmission device further starts the operation of the imaging unit in response to an instruction to start imaging from the communication unit of the imaging signal reception device. A stop detection step for detecting a vehicle stop;
A calculation step for calculating a vehicle speed and a vehicle steering angle;
A storage step of storing a history of a predetermined period between a vehicle speed calculated by the calculation unit and a steering angle calculated by the calculation unit in a storage unit;
Stop is detected in the stop detection step, the maximum value of the speed of the predetermined period stored in the storage step is smaller than the speed threshold value, the steering angle of the handle of the predetermined period stored in the storage step An imaging method in an in-vehicle camera system, comprising: a captured image output step of outputting an image obtained by capturing an image around a vehicle when the maximum value is larger than a turning angle threshold value. The imaging method further includes a hazard detection step of detecting lighting of a hazard lamp of the vehicle,
The captured image output step further includes detecting a stop in the stop detection step, and outputting an image obtained by capturing an image around the vehicle when a hazard lamp is turned on in the hazard detection step. 5. The imaging method according to 4.

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