CN109918033B - Vehicle-mounted display equipment display memory safety detection method - Google Patents
Vehicle-mounted display equipment display memory safety detection method Download PDFInfo
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- CN109918033B CN109918033B CN201811548897.6A CN201811548897A CN109918033B CN 109918033 B CN109918033 B CN 109918033B CN 201811548897 A CN201811548897 A CN 201811548897A CN 109918033 B CN109918033 B CN 109918033B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
- G06F3/1407—General aspects irrespective of display type, e.g. determination of decimal point position, display with fixed or driving decimal point, suppression of non-significant zeros
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/16—Error detection or correction of the data by redundancy in hardware
- G06F11/1608—Error detection by comparing the output signals of redundant hardware
- G06F11/1616—Error detection by comparing the output signals of redundant hardware where the redundant component is an I/O device or an adapter therefor
- G06F11/162—Displays
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/36—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of a graphic pattern, e.g. using an all-points-addressable [APA] memory
- G09G5/39—Control of the bit-mapped memory
- G09G5/393—Arrangements for updating the contents of the bit-mapped memory
Abstract
The invention relates to a safety detection method for a display memory of a vehicle-mounted display device, which comprises the following steps: the safety unit sends a first display information code and a first random check code to the display unit; the display unit returns pixel information of a display area containing the first display information code and the first random check code to the safety unit; the safety unit extracts a second display information code and a second random check code from the pixel information, compares the first random check code with the second random check code and compares the first display information code with the second display information code; and when the first random check code is different from the second random check code or the first display information code is different from the second display information code, the safety unit judges that the display is wrong. By adopting the scheme, the invention can realize end-to-end safe text display verification at lower cost.
Description
The patent application of the invention is a divisional application of the invention and creation name of a video memory security detection method based on pixel block return detection, the application date of the original application is 2016, 8 and 22 days, and the application number is 2016107070930.
[ technical field ] A
The invention relates to the field of vehicle-mounted equipment, in particular to a video memory security detection method based on pixel block return detection.
[ background ] A method for producing a semiconductor device
Various display devices and safety devices are arranged on the train which runs at present. The vehicle-mounted display device has the following problems: ATP (in-vehicle safety equipment) cannot check the "operation mode" displayed on the TOD (in-vehicle display), and when TOD fails to display the "RM (restricted operation mode)" mode as "CM/AM (controlled manual driving mode/automatic train driving mode)", driving dangers are caused. That is, the existing vehicle-mounted device has no effective detection method for the contents that need to be displayed safely, only adopts the mode of returning the displayed contents, and does not realize end-to-end detection.
[ summary of the invention ]
In order to solve the foregoing problems, the present invention provides a method for detecting the display memory security of a vehicle-mounted display device, which detects display contents.
In order to achieve the purpose, the invention adopts the following technical scheme: a safety detection method for a display memory of a vehicle-mounted display device comprises the following steps:
the method comprises the steps that a safety unit sends a first display information code and a first random check code to a display unit, the display unit determines a picture to be displayed according to the first display information code, and the display picture comprises the first display information code, display information and the first random check code;
the display unit returns pixel information of a display area containing the first display information code and the first random check code to the safety unit;
the safety unit extracts a second display information code and a second random check code from the pixel information, compares the first random check code with the second random check code and compares the first display information code with the second display information code;
when the first random check code is different from the second random check code or the first display information code is different from the second display information code, the safety unit judges that a display error exists;
the display picture comprises the first display information code, display information and a first random check code, the display picture is stored in a display unit in advance, the first display information code, the display information and the first random check code which are included in the display picture are sequentially and alternately arranged on the display picture, and pixel information which is returned to the safety unit by the display unit is pixel information of the display picture.
Optionally: the display picture comprises N display areas of the first random check code and N display areas of the display information code, wherein N is greater than or equal to 1.
Optionally: and the distance between the display area of the first random check code and the display area of the first display information code and the frame of the display area of the display unit is a fixed value.
Optionally: the first display information is encoded as a finite set; or, the first random check code is an ordered sequence and a limited set.
Optionally: the first display information code and the first random check code are coded in a squared figure mode.
Optionally: the bit number of each pixel point in the pixel information is M, and M is more than or equal to 1 and less than or equal to 8.
Optionally: and after the safety unit sends the first random check code and the first display information code to the display unit, caching the first random check code and the first display information code. After the safety unit extracts the second random check code and the second display information code from the pixel, the first random check code and the first display information code can be found according to the ordered random check codes and compared.
By adopting the scheme, the invention can realize end-to-end safe text display verification at lower cost. Thus, accidents caused by display problems are avoided. The functions of the vehicle-mounted equipment are more complete, and the safety of the whole train operation system is higher.
These features and advantages of the present invention will be disclosed in more detail in the following detailed description and the accompanying drawings.
[ description of the drawings ]
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic flow chart of a method of embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of a display picture according to embodiment 1 of the present invention.
[ detailed description ] A
The technical solutions of the embodiments of the present invention are explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the embodiments described below are only preferred embodiments of the present invention, and not all of them. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.
Example 1.
Referring to fig. 1, a method for detecting the display memory safety of a vehicle-mounted display device includes the following steps:
the safety unit sends a first display information code and a first random check code to the display unit, the display unit determines a picture to be displayed according to the first display information code, and the display picture comprises the first display information code, display information and the first random check code;
the display unit returns pixel information of a display area containing the first display information code and the first random check code to the safety unit;
the safety unit extracts a second display information code and a second random check code from the pixel information, compares the first random check code with the second random check code and compares the first display information code with the second display information code;
and when the first random check code is different from the second random check code or the first display information code is different from the second display information code, the safety unit judges that the display is wrong.
Referring to fig. 2, the display picture includes a first display information code, display information, and a first random check code, and the display picture is stored in the display unit in advance. The display area of the first random check code included in the display picture is N, the display area of the display information code is N, and N is more than or equal to 1. The display picture comprises a first display information code, display information and a first random check code which are alternately arranged on the display picture in sequence.
The distance between the display area of the first random check code and the display area of the first display information code and the frame of the display area of the display unit is a fixed value. As shown in fig. 2, the height offset and the width offset are constant values, such as 10 mm, 8 mm, etc.
The first information is encoded into a finite set, and the first random check code is an ordered sequence and is a finite set. The first information code and the first random check code are coded in a squared figure mode.
The pixel information transmitted back to the safety unit by the display unit is the pixel information of the display picture. The bit number of each pixel point in the pixel information is M, and M is more than or equal to 1 and less than or equal to 8. The reading mode of the pixel information of the display picture is as follows; the method of reading the pixels may be a screen shot (general method), a manner of driving reading from a display device (linux frame buffer).
And after the safety unit sends the first random check code and the first display information code to the display unit, caching the first random check code and the first display information code. After the second random check code and the second display information code are extracted from the pixel, the safety unit can find the first random check code and the first display information code according to the ordered random check code and compare the first random check code and the first display information code.
While the invention has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in many different forms without departing from the spirit and scope of the invention as set forth in the following claims. Any modifications which do not depart from the functional and structural principles of the present invention are intended to be included within the scope of the claims.
Claims (7)
1. A safety detection method for a display memory of a vehicle-mounted display device is characterized by comprising the following steps:
the safety unit sends a first display information code and a first random check code to a display unit, the display unit determines a picture to be displayed according to the first display information code, and the display picture comprises the first display information code, display information and the first random check code;
the display unit returns pixel information of a display area containing the first display information code and the first random check code to the safety unit;
the safety unit extracts a second display information code and a second random check code from the pixel information, compares the first random check code with the second random check code and compares the first display information code with the second display information code;
when the first random check code is different from the second random check code or the first display information code is different from the second display information code, the safety unit judges that a display error exists;
the display picture comprises the first display information code, display information and a first random check code, the display picture is stored in a display unit in advance, the first display information code, the display information and the first random check code which are included in the display picture are sequentially and alternately arranged on the display picture, and pixel information returned to the safety unit by the display unit is pixel information of the display picture.
2. The safety detection method for the display memory of the vehicle-mounted display equipment according to claim 1, characterized in that: the display area of the first random check code included in the display picture is N, the display area of the display information code is N, and N is greater than or equal to 1.
3. The vehicle-mounted display device video memory safety detection method according to claim 1, characterized in that: and the distance between the display area of the first random check code and the display area of the first display information code and the frame of the display area of the display unit is a fixed value.
4. The vehicle-mounted display device video memory safety detection method according to claim 1, characterized in that: the first display information is encoded as a finite set; or, the first random check code is an ordered sequence and a limited set.
5. The safety detection method for the display memory of the vehicle-mounted display equipment according to claim 1, characterized in that: the first display information code and the first random check code are coded in a squared figure mode.
6. The safety detection method for the display memory of the vehicle-mounted display equipment according to claim 1, characterized in that: the bit number of each pixel point in the pixel information is M, and M is more than or equal to 1 and less than or equal to 8.
7. The vehicle-mounted display device video memory safety detection method according to claim 1, characterized in that: after the safety unit sends the first random check code and the first display information code to the display unit, caching the first random check code and the first display information code; after the second random check code and the second display information code are extracted from the pixel, the safety unit can find the first random check code and the first display information code according to the ordered random check code and compare the first random check code and the first display information code.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811548897.6A CN109918033B (en) | 2016-08-22 | 2016-08-22 | Vehicle-mounted display equipment display memory safety detection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811548897.6A CN109918033B (en) | 2016-08-22 | 2016-08-22 | Vehicle-mounted display equipment display memory safety detection method |
| CN201610707093.0A CN106371783B (en) | 2016-08-22 | 2016-08-22 | A kind of safety display detection method for returning inspection based on block of pixels |
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| CN201610707093.0A Division CN106371783B (en) | 2016-08-22 | 2016-08-22 | A kind of safety display detection method for returning inspection based on block of pixels |
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| CN109918033A CN109918033A (en) | 2019-06-21 |
| CN109918033B true CN109918033B (en) | 2022-07-26 |
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| CN201811548897.6A Active CN109918033B (en) | 2016-08-22 | 2016-08-22 | Vehicle-mounted display equipment display memory safety detection method |
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| US7724259B2 (en) * | 2005-08-24 | 2010-05-25 | Innovative Solutions And Support, Inc. | Aircraft flat panel display system with improved information availability |
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| EP2244188A1 (en) * | 2009-04-25 | 2010-10-27 | Thales Deutschland Holding GmbH | Method for verifying correct data transfer to a video memory |
| CN103002251A (en) * | 2011-09-16 | 2013-03-27 | 现代摩比斯株式会社 | Image display device for vehicle and method for displaying rapid changed image inputted from camera for vehicle |
| EP2779151A1 (en) * | 2013-03-11 | 2014-09-17 | Renesas Electronics Europe Limited | Video output checker |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109918033A (en) | 2019-06-21 |
| CN106371783B (en) | 2019-05-07 |
| CN106371783A (en) | 2017-02-01 |
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