JP2000280822A - Back monitor device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate a rearward safety confirmation and controllability by a driver when a vehicle moves backward by displaying a predicted course route excellent in visibility when the predicted course route of the vehicle is displayed superimposedly on a rearward image when the vehicle moves backward. SOLUTION: This monitor device displays the predicted course route of a vehicle according to a steering angle on display means 3 when the vehicle moves backward by superimposing it on the rearward image photographed by photographing means 2. In this case, brightness data acquisition means 9 obtains backward image brightness data values. The brightness setting means 8A sets the brightness values of the predicted course route according to the brightness data values of the rearward image from the brightness data acquisition means 9 so that the predicted course route can be well recognized visually in the rearward image.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back monitor apparatus for a vehicle, which displays a predicted course of a vehicle according to a steering angle when the vehicle retreats on a monitor by superimposing the track on a rear image.

[0002]

2. Description of the Related Art In recent years, back monitor devices for checking the rear of a vehicle have become widespread. The feature of this back monitor device is that the driver of the vehicle can easily confirm the rear (periphery) by monitoring the blind spot portion of the rearview mirror with a video camera. ) Is effective when the area right behind becomes blind spot. Some back monitor devices not only display images to a driver, but also refer to Japanese Patent Application Laid-Open No. 64-14700.
As in the case of the vehicle, there is even a device that improves the operability of the driver by superimposing and displaying a predicted course trajectory corresponding to the steering angle on the rear image of the monitor when the vehicle retreats.

[0003]

When a monitor or a video camera is black and white, an image displayed on the monitor is represented by a change in luminance from white to black. For example, if the display color of the predicted course trajectory is white, the road surface in the rear image is white concrete, or the sunlight is directly or directly incident on the video camera due to the reflection of the road surface, and the screen is glaring. Then, the display becomes very difficult for the driver to confirm. In addition, when the display color of the predicted course trajectory is an intermediate color, the predicted course display that is clear and easy for the driver to see cannot be performed. Also, in the case of color display using a color video camera and a color monitor, if the predicted course is superimposed and displayed in a color similar to or close to the landscape color of the rear image, the display becomes difficult for the driver to see.

Accordingly, an object of the present invention is to display a predicted path trajectory excellent in visibility when a predicted path trajectory of a vehicle according to a steering angle is superimposed and displayed on a rear image taken by a video camera when the vehicle retreats. Accordingly, it is an object of the present invention to provide a vehicular back monitor device capable of easily confirming the driver's rear safety and operability when the vehicle retreats.

[0005]

SUMMARY OF THE INVENTION In view of the above object, a vehicle back monitor device according to the first aspect of the present invention comprises:
As shown in the basic configuration diagram of FIG. 1, a vehicle back monitor device that displays a predicted course of a vehicle according to a steering angle when the vehicle retreats on a display unit 3 so as to be superimposed on a rearward image captured by the imaging unit 2. A luminance data acquiring unit 9 for acquiring a luminance data value of the rear image;
Brightness setting means 8A for setting the luminance value of the predicted path trajectory in accordance with the luminance data value of the rearward image from the rearward image so that the predicted path trajectory can be visually recognized well in the rearward image.
And

[0006] In the vehicle back monitor device according to the first aspect, the brightness setting means 8A includes the brightness data obtaining means 9.
The luminance value is set in accordance with the luminance data value of the rear image from the rear image so that the predicted course trajectory is visually well recognized in the rear image.

Further, in the vehicle back monitor device according to the second aspect of the present invention, the luminance data acquiring means 9 acquires the luminance data value of a partial area of the rear image.

In the back monitor device for a vehicle according to the third aspect of the invention, the partial area of the rear image is an area near the vehicle or an area around the predicted course locus display position.

Further, in the back monitor device for a vehicle according to the present invention, the luminance data acquiring means acquires the luminance data value of the entire area of the rear image.

Further, in the back monitor device for a vehicle according to the present invention, the luminance data obtaining means 9 obtains statistics of the luminance distribution of the pixels in the area of the rear image and calculates the average luminance from the statistics. The brightness data value is used.

Further, in the vehicle back monitor device according to the present invention, the brightness setting means 8A may be configured to perform the prediction when the brightness data value from the brightness data obtaining means 9 is a value equal to or less than a preset threshold value. First that exceeds the luminance of the path trajectory
If the luminance data value from the luminance data acquisition means exceeds the threshold value, the luminance of the predicted course trajectory is set to the second predetermined luminance equal to or less than the threshold value.

In the back monitor device for a vehicle according to the present invention, the first predetermined luminance is luminance corresponding to white, and the second predetermined luminance is luminance corresponding to black. It is characterized by the following.

The back monitor device for a vehicle according to the invention described in claim 8 further includes an O of the small lamp switch 6.
A detection means 8B for detecting N / OFF is provided. When the detection means 8B detects the small lamp ON, the luminance setting means 8A determines the luminance of the predicted course trajectory regardless of the value of the luminance data from the luminance data acquisition means 9. The brightness is set to be equivalent to white.

Further, in the vehicle back monitor device according to the ninth aspect of the present invention, as shown in the basic configuration diagram of FIG. A back monitor device for a vehicle, which is superimposed on a rear image and displayed on a display unit, comprising: a luminance data obtaining unit for obtaining a luminance data value of the rear image; and a color data obtaining unit for obtaining a color data value of the rear image. In accordance with the color data value and the luminance data value of the rear image from the luminance data obtaining unit 9A and the luminance data obtaining unit 9A, the predicted path trajectory can be visually and satisfactorily recognized in the rear image. And a display luminance color setting means 8C for setting the color and luminance value of the predicted course trajectory.

In the back monitor device for a vehicle according to the ninth aspect, the display brightness color setting means 8C converts the color data value and the brightness data value of the rear image from the brightness data obtaining means 9 and the color data obtaining means 9A. Accordingly, the color and the luminance value of the predicted path trajectory are set such that the predicted path trajectory is visually recognized well in the rear image.

According to a tenth aspect of the present invention, in the vehicle back monitor device, the color data obtaining means obtains a color data value of a partial area of the rear image, and obtains the luminance data obtaining means.
Has obtained the luminance data value of a partial area.

Further, in the back monitor device for a vehicle according to the present invention, the partial area of the rear image is an area near the vehicle or an area around the predicted course locus display position.

According to a twelfth aspect of the present invention, the color data obtaining means 9A obtains the color data value of the entire area of the rear image, and obtains the luminance data obtaining means 9A.
Has acquired the brightness data value of the whole area.

According to a thirteenth aspect of the present invention, the color data acquiring means 9A calculates a dominant color from the color distribution of the pixels in the area of the rear image to obtain a color data value. The luminance data obtaining means 9 obtains statistics of the luminance distribution of the pixels in the area of the rear image, calculates an average luminance from the statistics, and sets the average luminance data value.

Further, in the vehicle back monitor device according to the present invention, the display luminance color setting means 8C is arranged such that the luminance data value from the luminance data acquiring means 9 is equal to or less than a predetermined first threshold value. In the case of, the luminance of the predicted course trajectory is set to a first predetermined luminance exceeding the first threshold, and if the luminance data value from the luminance data acquiring means 9 is a value exceeding the first threshold, When the luminance of the predicted course trajectory is set to a second predetermined luminance equal to or less than the first threshold, and the color data value from the color data acquisition unit 9A is equal to or less than the preset second threshold, If the color of the predicted course trajectory is set to a first predetermined color exceeding the second threshold, and if the color data value from the color data acquisition means 9A is a value exceeding the second threshold, the color of the predicted course trajectory is set. To a second predetermined color equal to or less than a second threshold That.

In the back monitor device for a vehicle according to the present invention, the first and second predetermined colors are set so as to have a complementary color relationship with the color data value from the color data acquisition means 9A. Is done.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle back monitor device according to the present invention will be described below with reference to FIGS.

FIG. 3 is a block diagram showing an embodiment of a vehicle back monitor according to the present invention. In FIG.
The vehicular back monitor device includes a controller 1, a video camera 2 as an imaging unit, and a monitor 3 as a display unit. The controller 1 includes a steering sensor 4, a back sensor 5, a small lamp switch 6, a storage unit 7, a control unit 8 serving as a brightness setting unit and a detection unit, a display brightness color setting unit, a brightness data obtaining unit, and a color data obtaining unit. Signal processing unit 9 and frame memory 10
Consists of The video camera 2 is attached to, for example, the outside of the vehicle, and inputs image data of a scene behind the vehicle to the controller 1. The monitor 3 displays an image output from the controller 1 and superimposed on the rearward image from the video camera 2 and the predicted course of the vehicle when the vehicle retreats.

In the controller 1, the steering sensor 4 outputs a signal representing the steering angle of the steering wheel, which is changed by the operation of the steering wheel when the vehicle is moving backward, that is, the turning information of the vehicle according to the steering angle. The back sensor 5 is
ON / OFF to determine whether the vehicle is moving backward
Outputs an OFF signal. The back sensor 5 is provided, for example, in a transmission mechanism (not shown) of the vehicle, and outputs an ON signal when the gear position of the transmission mechanism enters a back gear position used when the vehicle retreats. Is in position other than reverse gear
Outputs the FF signal.

The small lamp switch 6 outputs a small lamp ON / OFF signal. The small lamp switch 6 is turned off during the daytime and other bright days, but is turned on by the driver's judgment when the surroundings are darkened in the evening or when the weather has worsened,
This is for making a driver of another vehicle recognize the presence of the vehicle. The storage unit 7 stores parameter values necessary for calculating the display position of the predicted course trajectory of the vehicle on the monitor screen of the monitor 3. The storage unit 7 is also a frame memory for temporarily storing image data captured from the video camera 2. Further, the storage unit 7 also stores in advance a display luminance color table including a plurality of display luminance colors having different luminances for setting the display luminance color of the predicted course of the vehicle.

The control section 8 is constituted by a microcomputer or the like, and calculates a drawing position on the monitor screen of the monitor 3 of a predicted course trajectory of the vehicle according to the steering angle at the time of vehicle retreat. Further, the control unit 8 selects a display luminance color of the predicted course of the vehicle from the luminance distribution of the image captured from the video camera 2. The signal processing unit 9 extracts a color signal and a luminance signal from the image signal output from the video camera 2, and calculates color data and luminance data by A / D conversion, respectively. In addition, the drawing position data of the predicted course of the vehicle calculated by the control unit 8 is superimposed on the image signal output from the video camera 2 and output to the monitor 3. The frame memory 10 stores the color data and the luminance data output from the signal processing unit 9 in a predetermined order.

In the above-described configuration, the image signal from the video camera 2 is a combination of a color signal and a luminance signal, and the brightness of the rear landscape color captured by the video camera 2 is represented by the luminance signal. Then, the signal processing unit 9
Then, when only the luminance signal is extracted from the image signal from the video camera 2 and A / D converted, luminance data represented by a number corresponding to the luminance can be obtained for each monitor pixel. When a color video signal is used, the signal processing unit 9
It is necessary to separate a color signal and a luminance signal before A / D conversion.

For example, if the luminance resolution is 256 colors, the luminance data value for each monitor pixel is 0 for black and 255 for white, and is a number from 0 to 255 according to the luminance. Also, if the color resolution is 256 colors,
The color data value for each monitor pixel is a number from 0 to 255 according to the color data value. The color data value 0 is black and matches the black of the luminance data value 0, and the color data value 255
Is white and coincides with white of the luminance data value 255.

In view of the above, in the signal processing section 9, the brightness of each pixel in a partial area of the rear image extracted from the image signal captured from the video camera 2, for example, an area near the vehicle or an area around the predicted course locus display position. Data and color data are stored in the frame memory 7 in a predetermined order.
The luminance data and the color data stored in the frame memory 7 are input to the control unit 8.

The control unit 8 obtains statistics of the luminance distribution from the luminance data of each pixel in the above-described region of the rear image, calculates the average luminance from the statistics, and obtains the luminance data. Further, the claim unit 8 calculates a dominant color from the color distribution of each pixel in the above-described region of the rear image and acquires the color as a color data value. There are various methods for calculating the dominant color,
For example, the color data values from 0 to 255 described above are obtained for each pixel, the color data values of all the pixels are summed, the average is calculated, and the obtained average value can be obtained as the color data value. . In another calculation method, the RGB values of the color of each pixel are summed for each of the R value, the G value, and the B value to obtain an average value, which is determined by the obtained average R value, average G value, and average B value. The color can be a color data value. Further, in the above description, the brightness and color calculation area is a partial area such as an area near the vehicle in the video camera image or an area around the predicted course path display position, but may be an entire area of the video camera image.

Further, when the vehicle is moving backward, the control unit 8 receives from the back sensor 5 an ON signal indicating that the vehicle is moving backward, and receives from the steering sensor 4 information about the turning of the vehicle corresponding to the steering angle. Is input.

The control unit 8 calculates a predicted course trajectory to the rear of the vehicle based on a signal indicating turning information of the vehicle according to the steering angle from the steering sensor 4 and the parameter value read from the storage unit 7. The drawing position of the monitor 3 on the monitor screen is calculated. Next, the control unit 8
Selects a display luminance color having a luminance value and a color corresponding to the acquired luminance data value and color data value from a plurality of different display luminance colors in the display luminance color table stored in the storage unit 7. . Next, the control unit 8 outputs to the signal processing unit 9 predicted path trajectory data obtained by adding the selected display luminance color to the calculated drawing path data of the predicted path trajectory.

The signal processing section 9 superimposes the predicted course locus data from the control section 8 on the rear image signal output from the video camera 2 and outputs it to the monitor 3. The monitor 3 superimposes and displays the rearward image and the predicted course trajectory having the selected display luminance color on the monitor screen.

At this time, according to the acquired luminance data value and color data value, a dark line can be displayed when the scenery is light, and a light line can be displayed when the scenery is dark. For example, a luminance and color resolution of 25
In the case of six colors, the threshold value of the shade is preferably set to about 100 in advance. That is, if both the luminance data value and the color data value of the calculation area of the rear image are values of 100 or less, the rear image is a dark landscape color. A display luminance color having a color and a luminance value is selected. In this way, a predicted course locus having a light display luminance color is drawn in a color display in a rear image of a dark landscape color, and a display with good visibility is obtained. Also, if both the luminance data value and the color data value of the calculation area of the rear image exceed 100, the rear image is a light landscape color. A display luminance color having a value and a color data value is selected. In this way, a predicted course locus having a dark display luminance color is drawn in a color display in a light landscape color rear image, and a display with good visibility is obtained. It should be noted that the color of the predicted course trajectory is selected as a color having a higher color contrast with respect to the color data value of the calculation area of the rear image. Preferably, the color has a complementary color relationship with the color data value of the calculation area of the rear image.

At this time, only the luminance value of the predicted course locus may be set using only the luminance data value without using the color data value of the rear image. That is, the selection of the luminance value of the predicted path trajectory is performed whenever the luminance data value of the calculation area of the rear image becomes a value of 100 or less (that is, when the rear image is dark) as the display luminance color of the predicted path trajectory. Draw a predicted path trajectory in white with a brightness value of 255,
Whenever the luminance data value of the calculation area of the rear image exceeds 100 (that is, when the rear image is bright), the predicted path trajectory is drawn in black having the luminance value 0 as the display luminance color of the predicted path trajectory. You may do it. Also in this case, a display with good visibility is obtained.

Next, a case where the small lamp switch 6 is turned on by the driver's judgment when the surroundings become dark in the evening or when the weather becomes bad will be described. When the control unit 8 detects that the small lamp switch 6 is turned on, the control unit 8 does not select the display luminance color of the predicted course trajectory according to the luminance data value of the luminance calculation area of the rear image, and changes the luminance of the predicted course trajectory. A display luminance color exceeding the above-described threshold, for example, white having a luminance value of 255 is set.
Thereby, when the small lamp switch 6 is ON,
By displaying the predicted course trajectory in a white line, when the surroundings become dark due to evening or bad weather,
It is easy to see at night.

Next, the above operation will be described with reference to the flowchart shown in FIG.

When the vehicle starts retreating (step S1),
The control unit 8 starts acquiring a signal corresponding to the steering angle from the steering sensor 2 (Step S2). Next, the control unit 8 determines whether or not the small lamp switch is turned on (step S3).

If the answer to step S3 is yes (that is, if the small lamp switch 4 is ON), the control unit 8 calculates the display position of the predicted course trajectory and then saves it in the storage unit 7. A white color is selected from a plurality of different display luminance colors in the displayed display luminance color table, and a white predicted course trajectory is input to the signal processing unit 9. The signal processing unit 9 superimposes the predicted course of the white line on the rearward image from the video camera 2 and displays it on the display screen of the monitor 3 (step S4).

On the other hand, if the answer to step S3 is NO (that is, if the small lamp switch 4 is OFF), the luminance data for the pixels in the predetermined area of the rear image from the video camera 2 is sampled ( (Step S5) Then, the control unit 8 determines whether or not the scenery in the rear image is a dark color (for example, whether or not the scenery is a dark landscape color having a threshold value of 100 or less) based on the sampled luminance data value (Step S5). S6).

If the result of the determination is yes (ie,
When it is determined that the rear view captured from the video camera 2 is dark color), the control unit 8 calculates the display position of the predicted course trajectory on the screen of the monitor 3 and then stores the display position in the storage unit 7. A light color (or white) is selected from a plurality of different display luminance colors in the displayed display luminance color table, and a light color (or white) predicted path trajectory is input to the signal processing unit 9. The signal processing unit 9 superimposes the predicted course of the light-colored (or white) line on the rearward image from the video camera 2 and displays it on the display screen of the monitor 3 (step S7).

If the result of the determination in step S6 is NO (that is, if it is determined that the rear scene captured from the video camera 2 is not dark, and therefore light), the control unit 8 sets the predicted course locus After calculating the display position on the screen of the monitor 3, a dark color (or black) is selected from a plurality of different display luminance colors in the display luminance color table stored in the storage unit 7, and the dark color (black) is selected. Is input to the signal processing unit 9. The signal processing unit 9 superimposes the predicted course of the dark (black) line on the rear image from the video camera 2 and displays it on the display screen of the monitor 3 (step S8).

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications and applications are possible. For example, the video camera 2 captures a scene behind the vehicle, but the rear may include not only directly behind but also obliquely behind.

[0044]

As described above, according to the first aspect of the present invention, the predicted path trajectory can be visually and satisfactorily recognized in the rear image according to the luminance data value of the rear image. Since the luminance value of the predicted course trajectory is set, display with excellent visibility is possible, and the driver's backward confirmation and operability when the vehicle retreats are facilitated.

According to the second aspect of the present invention, a partial area of the rear image is used for obtaining the luminance data value.
There is an advantage that the luminance data value to be processed is small and the processing is easy.

According to the third aspect of the present invention, the brightness data of the rear image is obtained from a partial area such as an area near the vehicle or an area around the predicted course locus display position. It is possible to display a predicted course trajectory with excellent visibility in a region near the vehicle where the driver should pay close attention or in a region around the predicted course trajectory display position.

According to the fourth aspect of the present invention, since the luminance data value is obtained by using the entire area of the rear image, the operation of selecting the area is not required, and the luminance data value can be easily obtained. Obtainable.

According to the fifth aspect of the present invention, the average luminance can be used as the luminance data value of the rear image.

According to the sixth aspect of the present invention, the luminance of the predicted course locus is set to a value having a good contrast with respect to the luminance of the area of the rear image at a predetermined threshold. The locus can be displayed with excellent visibility.

According to the seventh aspect of the present invention, the luminance of the predicted course trajectory is set to a luminance corresponding to white or black with respect to the luminance of the area of the rear image at a threshold value. The predicted course trajectory can be displayed.

According to the present invention, when the surroundings of the vehicle are dark, such as when the small lamp switch is turned on, the predicted course is displayed in white in a dark rear image, and the driver The predicted course trajectory can be clearly confirmed.

According to the ninth aspect, according to the color data value and the luminance data value of the rear image, the predicted path trajectory can be visually recognized well in the rear image.
Because the color and brightness value of the predicted course trajectory are set, it is possible to display the predicted course trajectory with excellent visibility in color,
This makes it easier for the driver to check behind the vehicle when the vehicle retreats and to operate the vehicle easily.

According to the tenth aspect of the present invention, since a partial area of the rear image is used for obtaining the color data value and the luminance data value, the luminance data value to be processed is small, and the processing is easy. There are advantages.

According to the eleventh aspect of the present invention, the color data value and the luminance data of the rear image are obtained from a partial area such as an area near the vehicle or an area around the predicted course locus display position. When the vehicle retreats, a color display of the predicted course trajectory with excellent visibility can be performed in an area near the vehicle where the driver should pay close attention or in an area around the predicted course trajectory display position.

According to the twelfth aspect of the present invention, since the color data value and the luminance data value are obtained by using the entire area of the rear image, the operation of selecting the area is not required, and the operation is simplified. A luminance data value can be obtained.

According to the thirteenth aspect, the dominant color and the average luminance in the rear image can be used as the color data value and the luminance data value.

According to the fourteenth aspect of the present invention, the color and the luminance of the predicted course locus are set to values having good contrast with respect to the color and the luminance of the region of the rear image at a predetermined threshold value. Thus, the predicted course locus can be displayed in color with excellent visibility.

According to the fifteenth aspect of the present invention, the first and second predetermined colors are set so as to have a complementary color relationship with the color data value from the color data acquisition means, so that the color contrast can be improved. As a result, the color display of the predicted course trajectory in the rear image looks sharper than it actually is.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of a vehicle back monitor device according to the present invention.

FIG. 2 is a block diagram showing a basic configuration of a vehicle back monitor device according to the present invention.

FIG. 3 is a block diagram showing one embodiment of a vehicle back monitor device according to the present invention.

FIG. 4 is a flowchart illustrating the operation of the block diagram of FIG. 3;

[Explanation of symbols]

 2 imaging means 3 display means 6 small lamp switch 8A brightness setting means 8B detection means 8C display brightness color setting means 9 brightness data acquisition means 9A color data acquisition means

 ──────────────────────────────────────────────────の Continued on the front page F term (reference) 5B057 AA16 CE08 DA20 DB06 DC22 DC25 5C022 AA04 AB15 AB30 AB62 AC01 AC13 AC69 AC78 CA00 5C054 AA01 AA05 CA04 CC05 CD03 CE02 CG02 CH01 EA05 EE04 FA01 FB03 FC12 FE12 FE23 FF03

Claims (15)

[Claims] 1. A vehicular back monitor device for displaying, on a display unit, a predicted course of a vehicle according to a steering angle when the vehicle retreats is superimposed on a rearward image captured by an imaging unit, the luminance data of the rearward image being provided. Brightness data acquisition means for acquiring a value, according to the brightness data value of the rear image from the brightness data acquisition means, so that the predicted course trajectory is visually well recognized in the rear image, A back monitor device for a vehicle, comprising: a luminance setting unit that sets a luminance value of a predicted course trajectory. 2. The back monitor device for a vehicle according to claim 1, wherein the brightness data obtaining unit obtains a brightness data value of a partial area of the rear image. 3. The back monitor device for a vehicle according to claim 2, wherein the partial area of the rear image is an area near the vehicle or an area around the predicted course locus display position. 4. The back monitor device for a vehicle according to claim 1, wherein the brightness data obtaining means obtains a brightness data value of an entire area of the rear image. 5. The luminance data acquiring means according to claim 1, wherein statistics of luminance distribution of pixels in the area of the rear image are obtained, and average luminance is calculated from the statistics to obtain a luminance data value. 5. The back monitor device for a vehicle according to claim 2, 3, 3 or 4. 6. The method according to claim 6, wherein the luminance setting unit is configured to, when the luminance data value from the luminance data acquiring unit is a value equal to or less than a predetermined threshold value, increase the luminance of the predicted course trajectory exceeding the threshold value. When the brightness is set to a predetermined brightness and the brightness data value from the brightness data obtaining means is a value exceeding the threshold, the brightness of the predicted course trajectory is set to a second predetermined brightness equal to or less than the threshold. The vehicle back monitor device according to claim 1, 2, 3, 4, or 5. 7. The vehicle according to claim 6, wherein the first predetermined luminance is luminance corresponding to white, and the second predetermined luminance is luminance corresponding to black. Back monitor device. 8. The small lamp switch is turned on.
/ OFF detection means, and when the detection means detects the small lamp ON, the brightness setting means:
7. The brightness of the predicted course locus is set to a brightness corresponding to white irrespective of the value of the brightness data from the brightness data obtaining means.
Or the back monitor device for a vehicle according to 7. 9. A back monitor device for a vehicle, wherein a predicted course of a vehicle according to a steering angle is superimposed on a rear image captured by an imaging unit and displayed on a display unit when the vehicle retreats, and the luminance data of the rear image is provided. Brightness data obtaining means for obtaining a value; color data obtaining means for obtaining a color data value of the rear image; and the color data value of the rear image from the brightness data obtaining means and the color data obtaining means. Display luminance color setting means for setting a color and a luminance value of the predicted path trajectory so that the predicted path trajectory is visually well recognized in the rear image according to the luminance data value. A back monitor device for a vehicle, comprising: 10. The color data acquiring unit acquires a color data value of a partial region of the rear image, and the luminance data acquiring unit acquires a luminance data value of the partial region. The vehicle back monitor device according to claim 9. 11. The back monitor device for a vehicle according to claim 10, wherein the partial area of the rear image is an area near a vehicle or an area around a predicted course locus display position. 12. The color data acquisition unit acquires color data values of the entire area of the rear image, and the luminance data acquisition unit acquires the luminance data values of the entire area. 10. The vehicle back monitor device according to claim 9. 13. The color data obtaining means calculates a dominant color from a color distribution of pixels in the area of the rear image and sets the color data value as the color data value. 10. The statistics of the luminance distribution of the pixels in the image data are obtained, and the average luminance is calculated from the statistics to obtain a luminance data value.
13. The vehicle back monitor device according to 10, 11, or 12. 14. The display luminance color setting means, when the luminance data value from the luminance data acquisition means is a value equal to or less than a first threshold value set in advance, sets the luminance of the predicted course trajectory to the first luminance value. If the luminance data value from the luminance data acquiring means is a value exceeding the first threshold, the luminance of the predicted course trajectory is set to the first predetermined luminance exceeding the first threshold. When the color data value from the color data acquisition means is a value equal to or less than a preset second threshold value, the color of the predicted course locus is set to a second predetermined luminance equal to or less than the threshold value. If the color data value from the color data obtaining means is a value exceeding the second threshold, the color of the predicted course locus is set to the first predetermined color exceeding the second threshold. A second less than or equal to a second threshold
10. The color is set to a predetermined color.
14. The back monitor device for a vehicle according to 0, 11, 12, or 13. 15. The vehicle according to claim 14, wherein the first and second predetermined colors are set so as to have a complementary color relationship with a color data value from the color data acquisition unit. Back monitor device.