KR102564021B1 - Apparatus and method for controlling display of rear image, vehicle system - Google Patents

Abstract

The present invention relates to a rear image display control apparatus and method, and a vehicle system. An apparatus for controlling a display of a rear image according to the present invention includes an image conversion unit generating a second image by converting a first image received from a camera that captures a screen of a display on which a rear image of a vehicle is output, and converting the second image into black and white. A divider for dividing into a preset number of cell regions, a calculator for calculating color contrast values of the divided cell regions, and brightness for adjusting a brightness setting value of the display based on the calculated color contrast values of the cell regions. It includes the setting part.

Description

Rear image display control device and method, and vehicle system

The present invention relates to a rear image display control apparatus and method, and a vehicle system.

This is a proposal for a plan to resolve the conditions for displaying rear images that need improvement in the North American rear vision laws and local certification testing agency observation results.

When the brightness level of the brightness control switch (leostat) of the vehicle instrument panel is set to the lowest value and the brightness level of the display such as the AVN system is set to the minimum value in the night mode (LCD dimming state), the driver cannot see the instrument panel and/or the display It may not be easy for a driver to recognize displayed information.

In particular, it may not be easy for a driver to recognize an object from a rear image displayed on a display while the vehicle is in a reverse state.

In addition, even when the brightness level of the brightness control switch (leostat) of the vehicle instrument panel is set to the maximum value and the brightness level of the display such as the AVN system is set to the maximum value, the driver may not be able to see the instrument panel and/or the display due to color bleeding. It may not be easy to recognize the displayed information.

However, since the visibility of the rear image displayed on the instrument panel and/or display has a great influence on safe driving, it is necessary to improve the visibility of the rear image displayed on the instrument panel and/or display when the brightness level is set to the minimum or maximum value. A plan is needed for

An object of the present invention is to automatically adjust the brightness of the display screen according to the color contrast value of the rear image in a situation where the surroundings are too dark or bright when the vehicle is reversing, thereby facilitating object recognition in the rear image, a rear image display control device and A method and a vehicle system are provided.

In addition, another object of the present invention is a rear image display control device to reduce the amount of calculation and time by converting the image taken from the screen of the display on which the rear image is output to black and white and calculating a color contrast value based on the black and white image. And to provide a method, and a vehicle system.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

In order to achieve the above object, a rear image display control device according to an embodiment of the present invention converts a first image received from a camera for photographing a screen of a display on which a rear image of a vehicle is output to black and white to produce a second image. An image conversion unit to generate, a division unit to divide the second image into a preset number of cell areas, a calculator to calculate color contrast values of the divided cell areas, and a color contrast value of the calculated cell areas based on the and a brightness setting unit for adjusting the brightness setting value of the display.

The calculation unit compares luminance values of cells included in the corresponding cell area for each of the divided cell areas to detect a first luminance value of the brightest cell and a second luminance value of the darkest cell, and the detected first luminance value A color contrast value of a corresponding cell area is calculated based on the luminance value and the second luminance value.

The calculation unit may calculate an average color contrast value for cell areas in units of each row from color contrast values of cell areas located in the same row among the divided cell areas.

The calculation unit may calculate an average color contrast value for the entire second image from an average color contrast value for the cell areas in each row unit.

The brightness compensator compares the average value of all color contrasts with a preset reference value and adjusts a set value of the brightness table of the display according to the comparison result.

The brightness compensator compares the average value of all color contrasts with a preset lower limit reference value, and adjusts a set value of the brightness table of the display upward when the average value of all color contrasts is less than or equal to the lower limit reference value.

The brightness compensating unit compares the average value of all color contrasts with a preset upper limit reference value, and adjusts the setting value of the brightness table of the display downward when the average value of all color contrasts is greater than or equal to the upper limit reference value.

The dividing unit may divide the cell area into a number corresponding to a predetermined ratio of the screen resolution of the display.

Each of the divided cell regions may have the same size.

In addition, the device according to the present invention, when the first image is output through the screen of the display, further comprising a control unit for controlling driving of the camera according to the brightness setting of at least one of the dashboard of the vehicle and the display characterized by

The brightness setting unit may initialize the adjusted brightness setting value of the display when the gear stage of the vehicle is changed from the R range.

In addition, a rear image display control method according to an embodiment of the present invention for achieving the above object is to convert a first image received from a camera for photographing a screen of a display on which a rear image of a vehicle is output to black and white to convert the second image to black and white. Generating an image, dividing the second image into a preset number of cell regions, calculating color contrast values of the divided cell regions, and calculating color contrast values of the divided cell regions, It is characterized in that it includes the step of adjusting the brightness setting value of the display.

In addition, a vehicle system according to an embodiment of the present invention for achieving the above object is a first camera for taking a first image of the rear of the vehicle, while the first image is output through a screen of a display A second camera captures a second image including the screen of the display, and a third image generated by converting the second image received from the second camera into black and white is divided into a preset number of cell areas to divide the divided cells into cells. and a rear image display control device that calculates color contrast values of the cell regions and adjusts a brightness setting value of the display based on the calculated color contrast values of the cell regions.

According to the present invention, an object in a rear image can be easily recognized by automatically adjusting a brightness setting value of a display in a situation where the surroundings are too dark or too bright when the vehicle is reversing.

In addition, according to the present invention, a color contrast value is calculated based on the black and white image by converting the image obtained by capturing the screen of the display outputting the rear image into black and white, thereby reducing the amount of calculation and time.

1 is a diagram illustrating a vehicle system to which a rear image display control device according to an embodiment of the present invention is applied.
2 is a diagram showing the configuration of a rear image display control device according to an embodiment of the present invention.
3 to 10B are diagrams illustrating an embodiment referenced to describe an operation of a rear image display control device according to an embodiment of the present invention.
11 and 12 are diagrams illustrating an operation flow for a rear image display control method according to an embodiment of the present invention.
13 is a diagram illustrating a computing system in which a method according to an embodiment of the present invention is executed.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to components of each drawing, it should be noted that the same components have the same numerals as much as possible even if they are displayed on different drawings. In addition, in describing an embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function hinders understanding of the embodiment of the present invention, the detailed description will be omitted.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, order, or order of the corresponding component is not limited by the term. In addition, unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, they should not be interpreted in an ideal or excessively formal meaning. don't

1 is a diagram illustrating a vehicle system to which a rear image display control device according to an embodiment of the present invention is applied.

Referring to FIG. 1 , a vehicle system according to the present invention may include a first camera 50, a second camera 60, and a rear image display control device 100.

The first camera 50 is a rear camera, and is disposed at an external rear end of the vehicle 10 to capture a rear image (hereinafter referred to as a 'first image'). The first camera 50 transmits the captured first image to the rear image display control device 100 so that it is output through the screen of the display 120 in the vehicle 10 .

The second camera 60 is a camera disposed inside the vehicle 10 and captures an indoor image of the vehicle 10 . In this case, the second camera 60 may be disposed such that the photographing angle faces the screen of the display 120 in the vehicle 10 and the display 120 is included within the photographing distance. For example, the second camera 60 may be implemented as an infrared camera to obtain a clear image even when capturing the screen of the display 120 at night.

When the gear stage of the vehicle 10 is changed to the R range, the second camera 60 captures the screen of the display 120 on which the first image is displayed. At this time, the second camera 60 transmits an image capturing the screen of the display 120 (hereinafter referred to as a 'second image') to the rear image display control device 100 .

The rear image display control device 100 analyzes the second image received from the second camera 60 and automatically adjusts the screen brightness of the display 120 based on the analysis result of the second image.

For example, when the average value of the color contrast of the second image obtained by capturing the screen of the display 120 in a state in which the brightness of the instrument panel and the screen brightness of the display 120 are set to the lowest value (L) is equal to or less than the preset lower limit reference value, the display ( 120), the luminance of the first image displayed on the screen is excessively low, making object recognition difficult.

In this case, the rear image display control device 100 increases the brightness of the screen of the display 120 so that the visibility of the object through the first image displayed on the screen of the display 120 is improved.

As another example, when the average color contrast value of the second image obtained by capturing the screen of the display 120 in a state where the brightness of the instrument panel and the screen brightness of the display 120 are set to the maximum value (H) is equal to or greater than the preset upper limit reference value, As the luminance of the first image displayed on the screen of the display 120 is excessively high, phenomena such as color bleeding occur, making object recognition difficult.

In this case, the rear image display control device 100 adjusts the screen brightness of the display 120 downward so that the visibility of the object through the first image displayed on the screen of the display 120 is improved.

A description of the detailed configuration of the rear image display control device 100 refers to the embodiment of FIG. 2 .

Here, the rear image display control device 100 according to the present invention may be implemented inside the vehicle 10 . At this time, the rear image display control device 100 may be integrally formed with the internal control units of the vehicle 10, implemented as a separate device and connected to the control units of the vehicle 10 by a separate connection means. may be

In addition, the rear image display control device 100 may operate in association with an AVN (Audio Video Navigation) system, and may be some devices constituting the AVN system.

2 is a diagram showing the configuration of a rear image display control device according to an embodiment of the present invention.

Referring to FIG. 2, the rear image display control device 100 includes a control unit 110, a display 120, a communication unit 140, a storage unit 150, an image conversion unit 160, a division unit 170, and a calculation unit. A unit 180 and a brightness setting unit 190 may be included. Here, the control unit 110, the image conversion unit 160, the division unit 170, the calculation unit 180, and the brightness setting unit 190 of the rear image display control device 100 according to the present embodiment are at least one or more It can be implemented as a processor.

The control unit 110 may process a signal transmitted between each component of the rear image display control device 100 .

The display 120 is disposed inside the vehicle 10 and displays a first image captured by the first camera 50 on the screen. The display 120 may display the first image captured through the first camera 50 on the screen only when the gear stage of the vehicle 10 is changed to the R range. In this case, the display 120 may be disposed in front of the driver's seat so that the driver can check the image. For example, the display 120 may be the display 120 included in the AVN system.

The screen brightness of the display 120 is adjusted based on a set value on a predefined brightness table. In this case, the brightness of the screen of the display 120 may be set differently according to an operation mode, for example, a day mode or a night mode.

When a touch sensor such as a touch film, a touch sheet, or a touch pad is provided, the display 120 operates as a touch screen and may be implemented in an integrated form of input means and output means.

At this time, the display 120 includes a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT LCD), an organic light-emitting diode (OLED), a flexible display ( At least one of a flexible display, a field emission display (FED), and a 3D display may be included.

The communication unit 140 may include a communication module supporting a communication interface with electrical components and/or control units provided in the vehicle 10 . Also, the communication unit 140 may communicate with the first camera 50 and the second camera 60 . As an example, the communication module may receive a first image from the first camera 50 . Also, the communication module may transmit the received first image to the display 120 under the control of the controller 110 . Also, the communication module may receive a second image from the second camera 60 .

Here, the communication module may include a module supporting vehicle network communication such as CAN (Controller Area Network) communication, LIN (Local Interconnect Network) communication, and Flex-Ray communication.

Also, the communication module may include a module for wireless Internet access or a module for short range communication. Here, wireless Internet technologies may include wireless LAN (WLAN), WiBro (Wireless Broadband), Wi-Fi, etc., and short-range communication technologies include Bluetooth, ZigBee , RFID (Radio Frequency Identification), infrared communication (Infrared Data Association, IrDA), and the like may be included.

The storage unit 150 may store data and/or algorithms necessary for the rear image display control device 100 to operate.

For example, the storage unit 150 may store the first image and/or the second image received through the communication unit 140 . In addition, the storage unit 150 may store commands, conditions, settings, and/or algorithms for converting the second image, dividing the image, analyzing color contrast values, and adjusting screen brightness according to the color contrast values. there is.

Here, the storage unit 150 includes RAM (Random Access Memory), SRAM (Static Random Access Memory), ROM (Read-Only Memory), PROM (Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory) It may include a storage medium such as.

The controller 110 outputs the first image received through the communication unit 140 to the display 120 when the gear stage of the vehicle 10 is changed to the R stage.

In addition, the controller 110 may transmit a control signal to the second camera 60 when the gear stage of the vehicle 10 is changed to the R stage. At this time, the second camera 60 captures a second image according to the control signal of the controller 110 and transmits it to the communication unit.

Here, the controller 110 may check the screen brightness levels of the instrument panel and display 120 of the vehicle 10 before transmitting the control signal to the second camera 60 . The controller 110 controls the second camera (only when both the screen brightness levels of the instrument panel and the display 120 are set to the minimum value (L) or when both the screen brightness levels of the instrument panel and the display 120 are set to the maximum value (H)). 60) may transmit a control signal.

When the second image is received through the communication unit 140, the controller 110 stores the received second image in the storage unit 150 and transmits it to the image conversion unit 160.

The image converter 160 converts the second image into a black and white third image. If the second image includes an area other than the screen area of the display 120, the image conversion unit 160 extracts only the screen area of the display 120 from the second image and converts the extracted image to the third image. can also be converted to Meanwhile, the controller 110 may extract only the screen area of the display 120 from the second image and transmit it to the image conversion unit 160 .

For an example of an operation of converting a second image into a third image in the image converter 160, refer to FIG. 3.

Referring to FIG. 3 , reference numeral 311 is a second image, which is a captured image of the screen of the display 120 . Since the second image 311 is a color image, a large amount of calculation is required to calculate the color contrast. Meanwhile, reference numeral 315 denotes a third image obtained by converting the second image to black and white, and when calculating the color contrast using the black and white image, the amount of calculation can be reduced compared to a color image. Accordingly, the image converter 160 converts the second image 311 into a third image 315 .

The image conversion unit 160 stores the black-and-white converted third image in the storage unit and transfers it to the controller 110 and/or the division unit 170 .

When a third image is input from the control unit 110 or the image conversion unit 160, the division unit 170 divides the third image into a preset number of cell areas. Here, it is assumed that each divided cell area has the same size. In this case, reference is made to FIG. 4 for an example of an operation of dividing the third image by the dividing unit 170 .

Referring to FIG. 4 , the division unit 170 may divide the third image 411 into N×M cell areas. Here, the division unit 170 may divide the third image into cell areas corresponding to 1/10 of the screen resolution of the display 120 . For example, when the screen resolution of the display 120 is 1280 x 720, the division unit 170 may divide the third image 411 into 128 horizontally and 72 vertically cell areas.

The segmentation unit 170 stores segmentation information of the third image in the storage unit and transfers it to the controller 110 and/or the calculation unit 180 .

When division information of the third image is input from the controller 110 or the calculator 180, the calculation unit 180 compares luminance values of cells included in the corresponding cell area for each divided cell area. At this time, the calculation unit 180 detects the first luminance value of the brightest cell and the second luminance value of the darkest cell for each cell region, and based on the detected first luminance value and the second luminance value, the corresponding cell region Calculate the color contrast value of Here, the color contrast value means a luminance difference.

An embodiment of an operation of calculating a color contrast value for each cell area is referred to FIG. 5 .

Referring to FIG. 5 , the calculator 180 compares luminance values of cells included in one cell area 513 divided from the third image 511 . At this time, the calculation unit 180 detects a first luminance value of the brightest cell corresponding to reference numeral 515 and a second luminance value of the darkest cell corresponding to reference numeral 517 .

The calculator 180 may calculate a color contrast value corresponding to the corresponding cell area 513 by applying the detected first and second luminance values to [Equation 1] below.

In [Equation 1], C is a color contrast value, Lb is a first luminance value of the brightest cell, and Ls is a second latitude value of the darkest cell.

For example, assuming that the first luminance value of the brightest cell corresponding to reference numeral 515 is 0.965 and the second luminance value of the darkest cell corresponding to reference numeral 517 is 0.055, the calculation unit 180 calculates the first luminance value. A value of C≒ 9.67 may be calculated by applying the luminance value and the second luminance value to [Equation 1].

In this way, the calculator 180 may calculate color contrast values for each of the divided cell areas. At this time, the calculator 180 allocates the calculated color contrast values of each cell area to the corresponding cell area.

According to the W3C standard, the color contrast value may be divided into a range of 1 to 21 as shown in FIG. 6 . At this time, 1 represents the darkest state and 21 represents the brightest state. For example, 4.5, which is the minimum range in which the background and text can be distinguished, may be set as the standard range. Of course, this is only one embodiment and is not limited to any one.

Meanwhile, the calculator 180 calculates an average color contrast value of cell areas located in the same row among the divided cell areas.

For example, as shown in FIG. 7 , when the division unit 170 divides the third image into N×M cell regions, each cell region is divided into N rows in total. Therefore, the calculator 180 calculates the average color contrast value 725 of the cell areas included in the N-th row 721 from the average color contrast value 715 of the cell areas included in the first row 711, so that a total of N The average color contrast value is obtained.

In this case, the calculation unit 180 may calculate an average color contrast value of the entire third image based on the N average color contrast values.

The brightness setting unit 190 compares the average color contrast value of the third image calculated by the calculation unit 180 with preset upper and lower limit reference values. The brightness setting unit 190 determines the value set in the brightness table of the display 120 when the average value of the color contrast of the third image calculated by the calculation unit 180 is greater than or equal to a preset upper limit value or less than or equal to a preset lower limit value. Adjust the

The brightness table of the display 120 is a table composed of brightness setting values (horizontal) and color contrast average values (vertical), as indicated by reference numeral 813 in FIG. 8 .

When rear image brightness adjustment is automatically set in the setting screen 811 of the display 120, the brightness setting unit 190 automatically sets the setting area 815 on the brightness table according to the brightness and/or color contrast value of the screen. By adjusting with , the setting value can be varied.

For example, the brightness setting unit 190 sets the setting area of the brightness table of the display 120 as shown in FIG. By moving from reference numeral 911 to reference numeral 915, the set value may be upwardly adjusted to exceed the color contrast value 4.

In this way, when the setting value of the brightness table of the display 120 is adjusted upward, the brightness of the second image displayed on the display 120 is upwardly adjusted from reference numeral 921 to reference numeral 925 as shown in FIG. Object recognition through an image becomes easy.

As another example, the brightness setting unit 190 sets the setting area of the brightness table of the display 120 as shown in FIG. By moving from reference numeral 1011 to reference numeral 1015, the setting value can be lowered to be less than the color contrast value 18.

In this way, when the setting value of the brightness table of the display 120 is adjusted downward, the brightness of the second image displayed on the display 120 is downwardly adjusted from reference numeral 1021 to 1025 as shown in FIG. 10B. Object recognition through an image becomes easy.

Meanwhile, when the gear stage of the vehicle 10 is changed from the R range to another range, the brightness setting unit 190 may initialize the setting values of the brightness table of the display 120 to default values.

The rear image display control device 100 according to this embodiment operating as described above may be implemented in the form of an independent hardware device including a memory and a processor that processes each operation, such as a microprocessor or a general-purpose computer system. It can be driven in a form included in other hardware devices.

The operation flow of the rear image display control device according to the present invention configured as described above will be described in more detail as follows.

11 and 12 are diagrams illustrating an operation flow for a rear image display control method according to an embodiment of the present invention.

As shown in FIG. 11 , the rear image display control device 100 displays the first image received from the first camera 50 through the display 120 when the gear stage is changed to the R stage (S110). (S120).

At this time, the rear image display control device 100 checks the screen brightness levels of the instrument panel and display 120 of the vehicle 10 and sets both the screen brightness levels of the instrument panel and the display 120 to the lowest value (L) (S130 ), and transmits a control signal to the second camera 60 to drive (S140).

Therefore, the second camera 60 captures the screen of the display 120 displaying the first image according to the control signal received in step 'S140', and transmits the captured second image to the rear image display control device 100. send to

Accordingly, when the second image is received from the second camera 60 (S150), the rear image display control device 100 converts the second image received in step 'S150' into black and white to generate a third image, and generates a black and white image. The converted third image is divided into a plurality of cell areas having a predetermined size (S170).

At this time, the rear image display control apparatus 100 compares the luminance values of the cells included in the corresponding cell region for each divided cell region of the third image in step 'S170' to calculate a color contrast value and correspond to the corresponding cell region. and assign (S180).

Here, a detailed operation of calculating a color contrast value corresponding to each cell region is referred to the embodiment of FIG. 5 described above.

In addition, the rear image display control apparatus 100 calculates an average color contrast value in row units for each divided cell region of the third image based on the color contrast value assigned to each cell region in step 'S180'. (S190). If, in step 'S190', the average value of color contrast in units of rows is equal to or less than the lower limit reference value (α) (S200), the rear image display control device 100 adjusts the brightness table setting value of the display 120 upward ( S210).

Processes 'S140' to 'S210' may be repeatedly performed until the gear stage is changed from R stage to another stage.

Meanwhile, when the gear stage is changed from the R range to another range (S220), the rear image display control device 100 initializes the upwardly adjusted brightness table setting value to a default value (S230) and ends the operation.

Meanwhile, as shown in FIG. 12 , when the gear stage is changed to the R range (S310), the rear image display control device 100 transmits the first image received from the first camera 50 through the display 120. It is displayed (S320).

At this time, the rear image display control device 100 checks the screen brightness levels of the instrument panel and the display 120 of the vehicle 10, and when both the screen brightness levels of the instrument panel and the display 120 are set to the maximum value (H) ( S330), the second camera 60 is driven by transmitting a control signal (S340).

Therefore, the second camera 60 photographs the screen of the display 120 displaying the first image according to the control signal received in step 'S340', and transmits the captured second image to the rear image display control device 100. send to

Accordingly, when the second image is received from the second camera 60 (S350), the rear image display control device 100 converts the second image received in step 'S350' into black and white to generate a third image, and generates a black and white image. The converted third image is divided into a plurality of cell areas having a predetermined size (S370).

At this time, the rear image display control apparatus 100 compares luminance values of cells included in the corresponding cell region for each divided cell region of the third image in step 'S370' to calculate a color contrast value and correspond to the corresponding cell region. and allocate (S380).

Here, a detailed operation of calculating a color contrast value corresponding to each cell region is referred to the embodiment of FIG. 5 described above.

In addition, the rear image display control apparatus 100 calculates an average color contrast value in row units for each divided cell region of the third image based on the color contrast value assigned to each cell region in step 'S380'. (S390). If the average color contrast value in units of rows calculated in step 'S390' is equal to or greater than the upper limit reference value β (S400), the rear image display control device 100 lowers the brightness table setting value of the display 120 ( S410).

Processes 'S340' to 'S410' may be repeatedly performed until the gear stage is changed from R stage to another stage.

Meanwhile, when the gear stage is changed from the R range to another range (S420), the rear image display control device 100 initializes the lowered brightness table setting value to a default value (S430) and ends the operation.

13 is a diagram illustrating a computing system in which a method according to an embodiment of the present invention is executed.

Referring to FIG. 13 , a computing system 1000 includes at least one processor 1100, a memory 1300, a user interface input device 1400, a user interface output device 1500, and storage connected through a bus 1200. 1600, and a network interface 1700.

The processor 1100 may be a central processing unit (CPU) or a semiconductor device that processes commands stored in the memory 1300 and/or the storage 1600 . The memory 1300 and the storage 1600 may include various types of volatile or nonvolatile storage media. For example, the memory 1300 may include a read only memory (ROM) 1310 and a random access memory (RAM) 1320 .

Accordingly, the steps of a method or algorithm described in connection with the embodiments disclosed herein may be directly implemented as hardware executed by the processor 1100, a software module, or a combination of the two. A software module resides in a storage medium (i.e., memory 1300 and/or storage 1600) such as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, or a CD-ROM. You may. An exemplary storage medium is coupled to the processor 1100, and the processor 1100 can read information from, and write information to, the storage medium. Alternatively, the storage medium may be integral with the processor 1100. The processor and storage medium may reside within an application specific integrated circuit (ASIC). An ASIC may reside within a user terminal. Alternatively, the processor and storage medium may reside as separate components within a user terminal.

The above description is merely an example of the technical idea of the present invention, and various modifications and variations can be made to those skilled in the art without departing from the essential characteristics of the present invention.

Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed according to the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

10: vehicle 50: first camera
60: second camera 100: rear image display control device
110: control unit 120: display
140: communication unit 150: storage unit
160: image conversion unit 170: division unit
180: calculation unit 190: brightness setting unit

Claims (20)

an image conversion unit generating a third image by converting a second image received from a camera that captures a screen of a display on which a first image photographed from the rear of the vehicle is output;
a segmentation unit dividing the third image into a predetermined number of cell areas;
a calculator configured to calculate color contrast values of the divided cell areas; and
A brightness setting unit that adjusts the brightness setting value of the display based on the calculated color contrast values of the cell regions.
Rear image display control device comprising a. The method of claim 1,
The calculator,
The first luminance value of the brightest cell and the second luminance value of the darkest cell are detected by comparing the luminance values of the cells included in the cell region for each of the divided cell regions, and the detected first luminance value and 2 A rear image display control device characterized in that a color contrast value of a corresponding cell area is calculated based on the luminance value. The method of claim 1,
The calculator,
The rear image display control device of claim 1 , wherein an average color contrast value for cell regions in each row is calculated from color contrast values of cell regions located in the same row among the divided cell regions. The method of claim 3,
The calculator,
and calculating an average color contrast value for the entire third image from an average color contrast value for the cell regions of each row unit. The method of claim 4,
brightness correction unit
The rear image display control device, characterized in that for comparing the average value of the entire color contrast with a preset reference value and adjusting the setting value of the brightness table of the display according to the comparison result. The method of claim 5,
The brightness correction unit,
The rear image display control device, characterized in that comparing the average value of the entire color contrast with a preset lower limit reference value and adjusting the setting value of the brightness table of the display upward when the average value of the total color contrast is less than or equal to the lower limit reference value. The method of claim 5,
The brightness correction unit,
The rear image display control device, characterized in that comparing the average value of all color contrasts with a preset upper limit reference value and lowering the setting value of the brightness table of the display when the average value of all color contrasts is greater than or equal to the upper limit reference value. The method of claim 1,
The division part,
Rear image display control device, characterized in that divided into a number of cell areas corresponding to a predetermined ratio of the screen resolution of the display. The method of claim 8,
The divided cell areas,
Rear image display control device, characterized in that each has the same size. The method of claim 1,
When the second image is output through the screen of the display, the rear image display control device further comprises a control unit for controlling driving of the camera according to a brightness setting of at least one of the dashboard of the vehicle and the display. . The method of claim 1,
The brightness setting unit,
The rear image display control device, characterized in that, when the gear stage of the vehicle is changed from the R stage, the adjusted brightness setting value of the display is initialized. generating a third image by converting a second image received from a camera photographing a screen of a display on which a first image photographed from the rear of the vehicle is output to black and white;
dividing the third image into a preset number of cell areas;
calculating color contrast values of the divided cell areas; and
Adjusting a brightness setting value of the display based on the calculated color contrast values of the cell regions
Rear image display control method comprising a. The method of claim 12,
The calculating step is
detecting a first luminance value of the brightest cell and a second luminance value of the darkest cell by comparing luminance values of cells included in the cell region for each of the divided cell regions; and
and calculating a color contrast value of a corresponding cell area based on the detected first and second luminance values. The method of claim 13,
The calculating step is
calculating an average color contrast value for cell areas in each row from color contrast values of cell areas located in the same row among the divided cell areas; and
The rear image display control method further comprising calculating an average color contrast value for the entire third image from an average color contrast value for the cell regions of each row unit. The method of claim 14,
Adjusting the brightness setting value of the display,
The rear image display control method, characterized in that comparing the average value of the entire color contrast with a preset reference value and adjusting the setting value of the brightness table of the display according to the comparison result. The method of claim 15
Adjusting the brightness setting value of the display,
Comparing the average value of all color contrasts with a preset lower limit reference value and adjusting the setting value of the brightness table of the display upward when the average value of all color contrasts is less than or equal to the lower limit reference value . The method of claim 15
Adjusting the brightness setting value of the display,
Comparing the average value of all color contrasts with a preset upper limit reference value and lowering the set value of the brightness table of the display when the average value of all color contrasts is greater than or equal to the upper limit reference value, the rear image display control method further comprising: . The method of claim 13,
When the first image is output through the screen of the display, controlling driving of the camera according to a brightness setting of at least one of the instrument panel of the vehicle and the display is further included. . The method of claim 12,
The rear image display control method further comprising the step of initializing the adjusted brightness setting value of the display when the gear stage of the vehicle is changed from the R stage. A first camera for taking a first image of the rear of the vehicle;
a second camera for taking a second image including the screen of the display while the first image is output through the screen of the display; and
A third image generated by converting the second image received from the second camera into black and white is divided into a preset number of cell regions, and color contrast values of the divided cell regions are calculated, and color contrast values of the calculated cell regions are divided. Rear image display control device for adjusting the brightness setting value of the display based on the value
Vehicle system comprising a.

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