KR20230082929A - System for verifying integrity of image - Google Patents

Abstract

The present invention relates to a system for verifying image integrity, which includes: an image processor which creates images; and a display module which receives the image from the image processor and outputs the image on a screen, wherein the image processor sets a specific, predetermined CRC (cyclic redundancy check) value to a display module, and the display module compares a CRC value calculated for the image received from the image processor with the specific CRC value, and if there is a mismatch, an image error is sent to the image processor.

Description

System and method for verifying image integrity {SYSTEM FOR VERIFYING INTEGRITY OF IMAGE}

The present invention relates to a system and method for verifying image integrity.

Conventionally, a liquid crystal display (LCD) module serves to simply output an image received from an image processor on a screen. The LCD module has no way to know even if an image different from the original is received due to data loss due to an external situation or some problem from the image processor.

Since the LCD module does not perform any check on the received image, even if the image transmitted by the image processor and the image received by the LCD module are different, it cannot inform the user whether accurate information is being displayed. Also, there is no way for the LCD module to inform the image processor that a problem has occurred with the received image.

The problem to be solved is that the application processor and the LCD module agree on a specific CRC value in advance, and the LCD module determines the image as an error image if the CRC value of the image received from the application processor is not the agreed upon specific CRC value. It is to provide a system and method for verifying the integrity of an image.

According to one feature, a system for verifying image integrity includes an image processor generating an image, and a display module receiving an image from the image processor and outputting the image to a screen, wherein the image processor includes a predetermined specific CRC ( A cyclic redundancy check) value is set in the display module, and the display module compares the CRC value calculated for the image received from the image processor with the specific CRC value, and transmits an image error to the image processor if they do not match. do.

The image processor may quantify the image CRC value of the generated image so that the image CRC value becomes the specific CRC value, and transmit the image having the quantified image CRC value to the display module.

When the image CRC value does not match the specific CRC value, the image processor may quantify the image CRC value by adding or subtracting a predetermined value to a specific pixel of the generated image.

The display module records a value indicating whether or not an image has an error in an error register, and the image processor accesses the error register to read a value indicating whether or not the image has an error, and transmits the image transmitted to the display module. You can check for errors.

The display module may set a GPIO level indicating whether or not an image error occurs in a general purpose input/output (GPIO) interface, and the image processor may receive the GPIO level from the GPIO interface.

The display module may include a CRC register in which the specific CRC value is recorded, and the image processor may access the CRC register through bus communication and record the specific CRC value.

The bus communication may include at least one of Inter-Integrated Circuit (I2C) communication and Serial Peripheral Interface (SPI) communication.

The image processor may generate an image constituting the vehicle cluster screen based on vehicle information, and the display module may output the image to the vehicle cluster screen.

According to another feature, as an operating method of an image processor, setting a predetermined specific cyclic redundancy check (CRC) value to verify image integrity in a display module, the image CRC value calculated for a generated image is the specific CRC value, correcting the generated image so that the image CRC value matches the specific CRC value, and transmitting an image whose CRC value is quantified so that the image CRC value matches the specific CRC value to the display module. and checking whether or not there is an error in the transmitted image from the display module.

In the correcting, if the image CRC value does not match the specific CRC value, the image CRC value may be quantified by adding or subtracting a predetermined value to a specific pixel of the generated image.

In the checking step, a value indicating whether or not an image error is recorded in an error register of the display module may be read or a GPIO level indicating whether an image error is set in a general purpose input/output (GPIO) interface of the display module may be checked. there is.

According to another feature, a method of operating a display module includes receiving an image from an image processor, comparing a CRC value calculated for the received image with a specific CRC value recorded in a cyclic redundancy check (CRC) register, and matching the result. Determining whether the CRC values do not match, determining an error of the received image if the CRC values do not match, and transmitting the error of the received image to the image processor.

The specific CRC value may be set by the image processor before receiving the image.

The transmitting may include writing a value indicating whether an image error exists in an error register accessible by the image processor, or indicating whether an image error exists in a general purpose input/output (GPIO) interface accessible by the image processor. You can set the GPIO level.

After the determining of the error, the method may further include performing at least one of popping up a message notifying the image error on the vehicle cluster screen or outputting an audible notification notifying the driver of the image error.

According to the embodiment, since the LCD module can notify the user and the application processor whether or not the image output on the screen accurately displays information, accidents that may occur due to incorrect information can be prevented.

In addition, by notifying the user that information on the LCD screen is not normal, it is possible to help the user not to trust the LCD screen.

In addition, the application processor can recognize that a normal screen is not displayed on the LCD screen and can take appropriate measures such as initializing or rebooting the LCD module.

1 is a schematic configuration diagram of an image integrity verification system according to an embodiment.
2 is a detailed configuration diagram of an image integrity verification system according to an embodiment.
3 is an exemplary view of an image pixel to be quantified for a CRC value according to an embodiment.
4 is a detailed configuration diagram of an image integrity verification system according to another embodiment.
5 is a flowchart illustrating an image integrity verification method according to an exemplary embodiment.
6 is a flowchart illustrating an image integrity verification method according to another embodiment.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a certain component is said to "include", it means that it may further include other components without excluding other components unless otherwise stated.

In addition, terms such as “…unit”, “…unit”, and “…module” described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. can

Devices described in the present invention are composed of hardware including at least one processor, memory device, communication device, and the like, and a program to be executed in combination with the hardware is stored in a designated place. The hardware has the configuration and capability to implement the method of the present invention. The program includes instructions implementing the operating method of the present invention described with reference to the drawings, and implements the present invention in combination with hardware such as a processor and a memory device.

In this specification, "transmission or provision" may include not only direct transmission or provision, but also indirect transmission or provision through another device or by using a detour path.

Expressions written in the singular in this specification may be interpreted in the singular or plural unless an explicit expression such as “one” or “single” is used.

In this specification, like reference numerals refer to like elements, regardless of drawing, and "and/or" includes each and every combination of one or more of the recited elements.

In this specification, terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. These terms are only used for the purpose of distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present disclosure.

In the flowcharts described herein with reference to the drawings, the order of operations may be changed, several operations may be merged, certain operations may be divided, and certain operations may not be performed.

1 is a schematic configuration diagram of an image integrity verification system according to an embodiment.

Referring to FIG. 1 , the image integrity verification system includes an application processor (AP) 100 and a liquid crystal display (LCD) module 200 .

According to one embodiment, the image integrity verification system may be included in a vehicle cluster device. The image integrity verification system can verify the integrity of the image displayed on the vehicle cluster screen. In this case, the application processor 100 processes vehicle information generated by various vehicle sensors and in-vehicle electronic devices through GUI (Graphical User Interface) to generate a frame-based image, or generates an image generated by taking a picture of a vehicle camera. You can process the data to create an image. An image generated by the application processor 100 may be output to the LCD module 200 and provided to a vehicle driver. In this case, the LCD module 200 may output an image on the cluster screen.

In addition, the image integrity verification system may be included in an image providing device having a screen displaying information to a user in addition to the vehicle cluster device.

The application processor 100 corresponds to a transmitting device that transmits images, and the LCD module 200 corresponds to a receiving device that receives images. Here, the LCD module 200 is a display module that receives and outputs an image, and is collectively referred to as the LCD module 200 in this specification.

The application processor 100 generates and renders image data and transmits it to the LCD module 200 . For example, the application processor 100 may receive sensing information transmitted from an external device (not shown) or an image taken by a camera, and transmit an image generated by processing the received image to the LCD module 200. .

The LCD module 200 outputs the image received from the application processor 100 to the screen.

At this time, the application processor 100 and the LCD module 200 check whether there is an error in the communication data using a cyclic redundancy check (CRC) value. The LCD module 200 checks the integrity of the image received from the application processor 100.

The LCD module 200 applies the same polynomial as that of the application processor 100 to the received image data and compares the resulting CRC value with a code added to the block of image data, that is, a CRC value. If the CRC values match, the LCD module 200 determines the image data as integrity, and if the CRC values do not match, the LCD module 200 may deliver an image error to the application processor 100 and output the image error as a visual or audible notification. there is. Accordingly, the application processor 100 can take appropriate measures for an image error, and the image error can be recognized by a user who has been provided with the image.

According to an embodiment, the application processor 100 and the LCD module 200 agree on a specific cyclic redundancy check (CRC) value in advance, and the LCD module 200 determines the CRC value of the image received from the application processor 100. If it is not a specific CRC value agreed upon, the image may be determined as an error image.

The application processor 100 and the LCD module 200 may communicate through an LCD control interface and an LCD interface.

The application processor 100 may set (write) a static CRC value in the LCD module 200 through the LCD control interface. Static CRC value means a fixed specific value.

The application processor 100 may read error information of the display image from the LCD module 200 through the LCD control interface.

The application processor 100 may transmit a display image to the LCD module 200 through an LCD interface.

2 is a detailed configuration diagram of an image integrity verification system according to an embodiment, and FIG. 3 is an exemplary diagram of an image pixel to be quantified with a CRC value according to an embodiment.

Referring to FIG. 2 , the application processor 100 includes an LCD control interface 101, an LCD interface 102, a CRC setting unit 103, an image generator 104, a CRC calculation unit 105, and an image transmission unit 106. ) and an error detection unit 107.

The LCD module 200 includes an LCD control interface 201, an LCD interface 202, a CRC register 203, an error register 204, an image receiving unit 205, an error detection unit 206, a CRC calculation unit 207, and a notification may include section 208 .

The LCD control interface 101 of the application processor 100 may perform bus interface communication with the LCD interface 102 of the LCD module 200 . Bus interface communication may include Inter-Integrated Circuit (I2C), Serial Peripheral Interface (SPI), and the like.

The LCD control interface 101 of the application processor 100 may access the CRC register 203 and the error register 204 of the LCD module 200 through the LCD interface 201 of the LCD module 200 .

The LCD interface 102 of the application processor 100 communicates with the LCD interface 202 of the LCD module 200 for image transmission. The LCD interfaces 102 and 202 may include RGB, Low Voltage Differential Signaling (LVDS), DisplayPort (DP), High Definition Multimedia Interface (HDMI), and the like.

The CRC setting unit 103 accesses the CRC register 203 through the LCD control interfaces 101 and 201 and sets a specific CRC value, that is, writes the specific CRC value.

The image generator 104 generates and renders image data. The image generator 104 may receive sensing information transmitted from an external device (not shown) or an image taken by a camera, and may process them to generate an image.

The CRC calculation unit 105 calculates a CRC value through CRC calculation on the image received from the image generation unit 104 . In general, the CRC value is a bit string of a specific length representing the remainder obtained by dividing a polynomial given by a data string by a specific polynomial. Simple and fast algorithms for finding this remainder are well known; for example, the CRC-32 algorithm can be used.

At this time, the image generator 104 may quantize the CRC value of the image by correcting the image so that the CRC value calculated for the image becomes a specific CRC value set by the CRC setting unit 101.

The image generator 104 compares whether the CRC value received from the CRC calculation unit 105 matches the specific CRC value set by the CRC setting unit 101, and if it does not match, subtracts or adds a certain value from the image to obtain a set CRC value. adjust to reach

For example, if the specific CRC value is '0x1234' and the CRC value of the image generated by the image generator 104 is '0x1230', the image generator 104 adds '4' to a specific pixel in the image to create an image The entire CRC value can be quantified as '0x1234'. Here, the specific pixel may be a predetermined pixel or an arbitrary pixel among pixels constituting the image.

According to one embodiment, the image generator 104 may add or subtract a specific pixel value to the last pixel value to quantify the CRC value of the image to reach a specific CRC value.

Referring to FIG. 3 , assuming that an image is composed of a total of 16 pixels, the image generator 104 adds or subtracts a certain value to the value of pixel 16, which is the last pixel, so that the CRC value of the image becomes a specific CRC value. Images can be corrected. 3 is only an example for convenience of explanation, and is not limited thereto.

The image transmitter 106 transmits an image in which the CRC value of the entire image is quantified to a specific CRC value to the LCD module 200 through the LCD interface 102 .

The error detector 107 may receive an integrity verification result of an image transmitted to the LCD module 200 from the LCD module 200 .

According to the embodiment, the error detection unit 107 may access the error register 204 through the LCD control interfaces 101 and 201 and read a value indicating whether or not there is an error. For example, the error detection unit 107 may read a 'correct' value representing the integrity of an image or an 'error' value representing an image error.

At this time, the error detection unit 107 may periodically access the error register 204.

The LCD control interface 201 is connected to the CRC register 203 and the error register 204. The LCD interface 202 is connected to the image receiver 205.

The image receiving unit 205 receives an image from the application processor 100 through the LCD interfaces 102 and 202 .

The CRC calculation unit 207 calculates a CRC value for the image received by the image receiving unit 205. The CRC calculator 207 calculates a CRC value for an image in the same manner as the CRC calculator 105 of the application processor 100 .

The error detector 206 reads a specific CRC value set by the application processor 100 from the CRC register 203. The error detection unit 206 compares the CRC value of the image received by the image reception unit 205 with a specific CRC value recorded in the CRC register 203 to determine whether they match. If the CRC values match, the error detection unit 206 may determine that the received image is flawless and may record a 'correct' value representing the integrity of the image in the error register 204 . If the CRC values do not match, the error detection unit 206 may determine that an error has occurred in the received image and may record an 'error' value indicating an image error in the error register 204 . At this time, a null value is recorded as a default value in the error register 204 instead of setting a 'correct' value, and an 'error' value may be recorded only when an error occurs.

When the error detection unit 206 determines that the CRC values do not match, the notification unit 208 may generate and output a visual notification or an audible notification indicating an image error. According to an embodiment, the notification unit 208 may pop up a message indicating an image error on the vehicle cluster screen or simultaneously or selectively output a notification that an 'image error' occurs. Accordingly, the driver may recognize that an error occurs in the image on the vehicle cluster screen.

FIG. 4 is a detailed configuration diagram of an image integrity verification system according to another embodiment. Descriptions of components identical to those of FIG. 2 will be omitted and components different from those of FIG. 2 will be mainly described.

Referring to FIG. 4 , the application processor 100 includes an LCD control interface 101, an LCD interface 102, a CRC setting unit 103, an image generator 104, a CRC calculation unit 105, and an image transmission unit 106. ) and an error detection unit 107.

The LCD module 200 includes an LCD control interface 201, an LCD interface 202, a CRC register 203, an image receiving unit 205, an error detection unit 206, a CRC calculation unit 207, a notification unit 208, and a GPIO. (General Purpose Input/Output) interface 209 may be included.

At this time, the difference from FIG. 2 is that the error detecting unit 107 of the application processor 100 may perform GPIO interface communication with the GPIO interface 209 of the LCD module 200 . If the error detection unit 206 of the LCD module 200 determines that the image is an error, it can set a GPIO level representing the image error. The error detection unit 107 of the application processor 100 may access the GPIO interface 209 to check the set GPIO level, and check whether an image error exists based on the checked GPIO level.

5 is a flowchart illustrating a method for verifying image integrity according to an exemplary embodiment, and shows operations corresponding to the exemplary embodiment of FIG. 2 .

Referring to FIG. 5 , the application processor 100 sets (writes) a static CRC value in the CRC register of the LCD module 200 (S101). In this case, the static CRC value may be a value previously set in the application processor 100 by an operator.

The application processor 100 generates an image (S102) and calculates a CRC value for the generated image (S103).

The application processor 100 compares the CRC value set in S101 with the image CRC value calculated in S103 (S104) to determine whether they match (S105).

If it is determined that the application processor 100 does not match in step S105, the application processor 100 modifies the image so that the image CRC value matches the static CRC value (S106). That is, the AP 100 quantifies the image CRC value so that the image CRC value becomes a specific CRC value by adding or subtracting a predetermined value to a specific pixel value of the image.

The application processor 100 transmits the image quantified to have the same image CRC value as the static CRC value to the LCD module 200 (S107).

The LCD module 200 calculates a CRC value for the image received in S107 (S108). The LCD module 200 compares the static CRC value set in S101 and the image CRC value calculated in S108 (S109) to determine whether they match (S111).

If it is determined that the LCD module 200 matches in S111, it determines the integrity of the image and writes a 'correct' value indicating the image integrity to the error register 204 (S113).

If it is determined that the LCD module 200 is inconsistent at S111, it is determined that it is an image error and an 'error' value representing the image error is recorded in the error register 204 (S115).

The application processor 100 reads the value recorded in the error register 204 and checks whether there is an image error (S117).

6 is a flowchart illustrating a method for verifying image integrity according to another embodiment, and shows operations corresponding to the embodiment of FIG. 4 .

At this time, since the flow chart of FIG. 6 is almost similar to that of FIG. 5, contents similar to those of FIG. 5 will be briefly described and focused on parts different from those of FIG.

Referring to FIG. 6 , the application processor 100 sets (writes) a static CRC value in the CRC register of the LCD module 200 (S201).

The application processor 100 generates an image (S202) and calculates a CRC value for the generated image (S203).

The application processor 100 compares the CRC value set in S201 with the image CRC value calculated in S203 (S204) to determine whether they match (S205).

If it is determined that the application processor 100 does not match in step S205, the application processor 100 modifies the image so that the image CRC value matches the static CRC value (S206).

The application processor 100 transmits the image whose CRC value is quantified to have the same image CRC value as the static CRC value to the LCD module 200 (S207).

The LCD module 200 calculates a CRC value for the image received in S207 (S208). The LCD module 200 compares the static CRC value set in S201 with the image CRC value calculated in S208 (S209) to determine whether they match (S210).

If it is determined that the LCD module 200 matches in S211, it sets the GPIO level corresponding to the 'correct' value representing image integrity (S211).

When it is determined that the LCD module 200 is inconsistent in step S211, the LCD module 200 sets a GPIO level corresponding to an 'error' value indicating an image error (S212).

The application processor 100 checks the GPIO level through the GPIO interface to determine whether there is an image error (S213).

The embodiments of the present invention described above are not implemented only through devices and methods, and may be implemented through programs that realize functions corresponding to the configuration of the embodiments of the present invention or a recording medium on which the programs are recorded.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims are also included in the scope of the present invention. that fall within the scope of the right.

Claims (15)

As a system for verifying image integrity,
an image processor that creates an image; and
A display module for receiving an image from the image processor and outputting it to a screen;
The image processor,
Setting a predetermined specific cyclic redundancy check (CRC) value to the display module;
The display module,
The CRC value calculated for the image received from the image processor is compared with the specific CRC value, and if they do not match, an image error is transmitted to the image processor. In paragraph 1,
The image processor,
The image integrity verification system for quantifying the image CRC value of the generated image so that it becomes the specific CRC value, and transmitting the image with the quantified image CRC value to the display module. In paragraph 2,
The image processor,
If the image CRC value does not match the specific CRC value, the image integrity verification system quantifies the image CRC value by adding or subtracting a predetermined value to a specific pixel of the generated image. In paragraph 1,
The display module,
Write a value indicating whether the image is in error in the error register,
The image processor,
An image integrity verification system for accessing the error register, reading a value indicating whether or not the image is erroneous, and confirming whether or not the image transmitted to the display module has an error. In paragraph 1,
The display module,
Set the GPIO level indicating whether there is an image error on the GPIO (General Purpose Input/Output) interface,
The image processor,
and receiving the GPIO level from the GPIO interface. In paragraph 1,
The display module,
A CRC register in which the specific CRC value is recorded;
The image processor,
An image integrity verification system that accesses the CRC register through bus communication and records the specific CRC value. In paragraph 6,
The bus communication is
An image integrity verification system comprising at least one of Inter-Integrated Circuit (I2C) communication or Serial Peripheral Interface (SPI) communication. In paragraph 1,
The image processor,
Based on the vehicle information, an image constituting the vehicle cluster screen is generated,
The display module,
An image integrity verification system that outputs the image to the vehicle cluster screen. As an operating method of an image processor,
Setting a predetermined specific cyclic redundancy check (CRC) value to verify image integrity in the display module;
If the image CRC value calculated for the generated image does not match the specific CRC value, correcting the generated image so that the image CRC value matches the specific CRC value;
Transmitting an image whose CRC value is quantified so that the image CRC value coincides with the specific CRC value to the display module; and
Checking whether or not there is an error in the transmitted image from the display module
Including, image integrity verification method. In paragraph 9,
The correcting step is
and quantifying the image CRC value by adding or subtracting a predetermined value to a specific pixel of the generated image if the image CRC value does not match the specific CRC value. In paragraph 9,
The checking step is
An image integrity verification method for reading a value indicating whether an image error is recorded in an error register of the display module or checking a GPIO level indicating whether an image error is set in a general purpose input/output (GPIO) interface of the display module. As a method of operating the display module,
receiving an image from an image processor;
Comparing the CRC value calculated for the received image with a specific CRC value recorded in a cyclic redundancy check (CRC) register to determine whether they match;
If the CRC values do not match, determining an error of the received image; and
Transmitting an error of the received image to the image processor
Including, operating method. In paragraph 12,
The specific CRC value,
set by the image processor before receiving the image. In paragraph 12,
The sending step is
Writing a value indicating whether an image error is present in an error register accessible by the image processor or setting a GPIO level indicating whether an image error is present in a General Purpose Input / Output (GPIO) interface accessible by the image processor, how it works. In paragraph 12,
After determining the error,
Performing at least one of popping up a message notifying an image error on the vehicle cluster screen or outputting an audible notification notifying a driver of an image error
Further comprising a method of operation.

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