CN111613162B - Fault detection method and device, LED display and storage medium - Google Patents
Fault detection method and device, LED display and storage medium Download PDFInfo
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Abstract
The application discloses a fault detection method, a fault detection device, an LED display and a storage medium. Wherein the method comprises the following steps: comparing pixel values of all pixels of the image displayed in the first predetermined area in the first display unit with the first judgment value to obtain a first pixel number with the pixel value smaller than the first judgment value; comparing pixel values of all pixels of an image displayed in a second preset area in a second display unit with a second judging value to obtain a second pixel number with the pixel value smaller than the second judging value, wherein the video stream is transmitted to the second display unit in a cascade connection mode by the first display unit, and the first preset area in the first display unit corresponds to the second preset area in the second display unit in position; and detecting a fault of cascading the video stream from the first display unit to the second display unit according to the first pixel number and the second pixel number. The application solves the technical problem of abnormal display caused by abnormal content of the video stream in the related technology.
Description
Technical Field
The application relates to the field of display, in particular to a fault detection method and device, an LED display and a storage medium.
Background
As is well known, light emitting diode (Light Emitting Diode, simply referred to as LED) display screens are tiled, i.e., a complete LED display screen is formed by a plurality of display units tiled in a certain sequence. The display unit and the display unit need to perform cascade transmission of the video data stream and the communication data stream. And because the LED display screen has more application scenes, the electrical environment is complex and various, and the problem of video stream transmission failure is probably solved, so that abnormal display is caused.
In the related art, in order to solve the above-mentioned problem of abnormal display, a method is adopted in which a detection device detects a video control signal of the present display unit, such as a field synchronization signal, a line synchronization signal, and a blanking signal, to thereby identify whether the video stream is correct in the present display unit. When the video control signal is detected to be incorrect in the display unit of the current stage, the decoding of the video stream of the current stage is reset or the coding of the display unit of the previous stage is reset, so that the cascade problem of video stream transmission is solved.
However, there are some drawbacks in adopting the above scheme, for example, first, the scheme can solve most of the cascading problem of video streaming, but still cannot solve all the cascading problem of video streaming. For example, the video control signal, such as field sync, line sync, blanking signal, of the display unit of the present stage is correct, but the video content is incorrect, e.g. the phenomenon exists in the field that the video stream content is not a correct image but a gray or black content. Because the content of the video stream is interfered and the video control signal is good under the complex and various electric environments, the decoder outputs black or gray content, namely, the current level unit and other normal display units display images of different frames, and the whole LED display screen is abnormal in display. Accordingly, in the related art, there is a problem in that the content of the video stream is abnormal, resulting in abnormal display.
In view of the above problems, no effective solution has been proposed at present.
Disclosure of Invention
The embodiment of the application provides a fault detection method, a fault detection device, an LED display and a storage medium, which at least solve the technical problem that display abnormality is caused by abnormal content of video streams in the related technology.
According to an aspect of the embodiment of the present application, there is provided a fault detection method, including: comparing pixel values of all pixels of an image displayed in a first predetermined area in a first display unit with a first judgment value to obtain a first pixel number of which the pixel values are smaller than the first judgment value; comparing pixel values of all pixels of an image displayed in a second predetermined area in a second display unit with a second judging value to obtain a second pixel number with the pixel value smaller than the second judging value, wherein video streams are transmitted to the second display unit in a cascade manner by the first display unit, and the first predetermined area in the first display unit corresponds to the second predetermined area in the second display unit in position; and detecting that the video stream is transmitted to the second display unit in a cascading way by the first display unit according to the first pixel number and the second pixel number.
Optionally, detecting, according to the first number of pixels and the second number of pixels, a failure of cascade transmission of the video stream by the first display unit to the second display unit includes: determining a first proportion of the first pixel number to all pixels of the image displayed in the first predetermined area, and determining a second proportion of the second pixel to all pixels of the image displayed in the second predetermined area; and detecting that the video stream is transmitted to the second display unit in a cascade connection mode by the first display unit according to the first proportion and the second proportion.
Optionally, detecting, according to the first ratio and the second ratio, a failure of cascade transmission of the video stream by the first display unit to the second display unit includes: comparing whether the first ratio exceeds a first predetermined ratio and comparing whether the second ratio exceeds a second predetermined ratio; and determining that the cascade transmission of the video stream from the first display unit to the second display unit is failed in the case that the first ratio does not exceed the first predetermined ratio and the second ratio exceeds the second predetermined ratio as a result of the comparison.
Optionally, the values of the first predetermined proportion and the second predetermined proportion are all 80% or more.
Optionally, the image displayed in the first predetermined area in the first display unit includes: the n-frame image of the video stream displayed in the first predetermined area, the image displayed in the second predetermined area in the second display unit includes: and displaying n frames of images of the video stream in the second preset area, wherein n is an integer greater than or equal to 2.
Optionally, the number of the first predetermined areas and the number of the second predetermined areas are all m, where m is an integer greater than or equal to 2.
Optionally, the first display unit and the second display unit are both display units in a light emitting diode LED display.
According to another aspect of the embodiment of the present application, there is provided a fault detection apparatus including: a first comparing module, configured to compare pixel values of all pixels of an image displayed in a first predetermined area in a first display unit with a first determination value, to obtain a first pixel number having a pixel value smaller than the first determination value; a second comparing module, configured to compare pixel values of all pixels of an image displayed in a second predetermined area in a second display unit with a second determination value to obtain a second pixel number with a pixel value smaller than the second determination value, where a video stream is transmitted by the first display unit to the second display unit in cascade, and the first predetermined area in the first display unit corresponds in position to the second predetermined area in the second display unit; and the detection module is used for detecting that the first display unit transmits the video stream fault to the second display unit in a cascading way according to the first pixel number and the second pixel number.
According to still another aspect of the embodiments of the present application, there is provided an LED display, wherein the light emitting diode LED display includes: the display device comprises a plurality of first display units, a plurality of second display units and a fault detection device, wherein the fault detection device is used for comparing pixel values of all pixels of an image displayed in a first preset area in the first display units with a first judgment value to obtain a first pixel number with the pixel value smaller than the first judgment value; comparing pixel values of all pixels of an image displayed in a second preset area in a second display unit with a second judging value to obtain a second pixel number with the pixel value smaller than the second judging value, wherein video streams are transmitted to the second display unit in a cascade manner by the first display unit, and the first preset area in the first display unit corresponds to the second preset area in the second display unit in position; and detecting a failure in cascade transmission of the video stream by the first display unit to the second display unit, based on the first number of pixels and the second number of pixels.
According to still another aspect of the embodiments of the present application, there is provided a storage medium, where the storage medium includes a stored program, where the program, when executed, controls a device in which the storage medium is located to perform any one of the above-mentioned fault detection methods.
In the embodiment of the application, the pixel values of all pixels of the image displayed in a first preset area in a first display unit are compared with a first judging value to obtain a first pixel number with the pixel value smaller than the first judging value; comparing the pixel values of all pixels of the image displayed in the second predetermined area in the second display unit with a second judgment value to obtain a second pixel number with the pixel value smaller than the second judgment value; and detecting that the first display unit transmits the video stream to the second display unit in a cascading way according to the first pixel number and the second pixel number, and comparing the pixel numbers smaller than a judgment value in the display units to achieve the purpose of detecting whether the content of the video stream transmitted in the cascading way between the display units is in failure or not, thereby realizing the technical effect of effectively detecting the display content error of the display units, and further solving the technical problem of display abnormality caused by the content abnormality of the video stream in the related technology.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is a flow chart of a fault detection method according to an embodiment of the present application;
fig. 2 is a block diagram of a fault detection device provided according to an embodiment of the present application;
fig. 3 is a block diagram of an LED display provided according to an embodiment of the present application.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
According to an embodiment of the present application, there is provided a method embodiment of a fault detection method, it being noted that the steps shown in the flowchart of the figures may be performed in a computer system such as a set of computer executable instructions, and, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in an order other than that shown or described herein.
Fig. 1 is a flowchart of a fault detection method according to an embodiment of the present application, as shown in fig. 1, the method including the steps of:
step S102, comparing the pixel values of all pixels of the image displayed in the first predetermined area in the first display unit with the first judgment value to obtain a first pixel number with the pixel value smaller than the first judgment value;
step S104, comparing the pixel values of all pixels of the image displayed in the second preset area in the second display unit with the second judging value to obtain a second pixel number with the pixel value smaller than the second judging value, wherein the video stream is transmitted to the second display unit in a cascade connection way by the first display unit, and the first preset area in the first display unit corresponds to the second preset area in the second display unit in position; it should be noted that, the step S102 and the step S104 may be executed first, and then the step S102 and the step S104 may be executed; step S104 may be performed first, step S102 may be performed later, and step S102 may be performed simultaneously with step S104.
Step S106, detecting the fault of cascading transmission video stream from the first display unit to the second display unit according to the first pixel number and the second pixel number.
Through the steps, the pixel values of all pixels of the image displayed in the first preset area in the first display unit are compared with the first judging value, so that a first pixel number with the pixel value smaller than the first judging value is obtained; comparing the pixel values of all pixels of the image displayed in the second predetermined area in the second display unit with the second determination value to obtain a second pixel number with the pixel value smaller than the second determination value; and detecting the fault of the video stream cascade-transmitted from the first display unit to the second display unit according to the first pixel number and the second pixel number, and comparing the pixel numbers smaller than the judgment value in the display units to achieve the purpose of detecting whether the content of the video stream cascade-transmitted between the display units is faulty or not, thereby realizing the technical effect of effectively detecting the display content error of the display units, and further solving the technical problem of display abnormality caused by the content abnormality of the video stream in the related technology.
As an optional embodiment, the first display unit and the second display unit may be both display units in the Light Emitting Diode (LED) display, that is, display content errors of the display units in the LED display may be effectively detected, so that cascade transmission of video streams by the display units in the LED display is more reliable and accurate.
As an alternative embodiment, when the pixel values of all pixels of the image displayed in the first predetermined area in the first display unit are compared with the first determination value to obtain a first pixel number with the pixel value smaller than the first determination value, and the pixel values of all pixels of the image displayed in the second predetermined area in the second display unit are compared with the second determination value to obtain a second pixel number with the pixel value smaller than the second determination value, the first display unit and the second display unit are both display areas divided by the display screen, for example, may be display units divided by the LED display screen. The first display unit is a display unit adjacent to the second display unit, and the video stream is transmitted from the first display unit to the adjacent second display unit in a cascade connection. It should be noted that the first display unit and the second display unit may be plural, and may be any display unit divided by the display screen. The terms "first" and "second" are used herein merely to describe the cascading transmission of a video stream between two display units.
In addition, the first predetermined area in the first display unit corresponds in position to the second predetermined area in the second display unit, that is, the first predetermined area and the second predetermined area are at the same position in the first display unit and the second display unit, respectively. For example, when the first display unit and the second display unit are each a matrix size of 6*6, the first predetermined area may be an area included in 1 st to 3 rd rows and 1 st to 3 rd columns of the first display unit, and the second predetermined area may be an area included in 1 st to 3 rd rows and 1 st to 3 rd columns of the second display unit. That is, the position of the first predetermined area at the first display unit is the same as the position of the second area at the second display unit. With such processing, since the obtained first pixel number and second pixel number are the same positions of the compared display units, respectively, it is possible to make the detection of the failure more accurate when detecting the failure of the cascade-transfer of the video stream from the first display unit to the second display unit based on the first pixel number and the second pixel number.
As an alternative embodiment, in order to make the fault detection more accurate, or effectively avoid the error existing in the single detection, the number of the first predetermined area and the second predetermined area may also be plural, that is, the number of the first predetermined area and the number of the second predetermined area are both m, where m is an integer greater than or equal to 2. In addition, the size of the first predetermined area and the second predetermined area may be flexibly set, for example, the first predetermined area may select any area smaller than or equal to the size of the first display unit, and the second predetermined area may select any area smaller than or equal to the size of the second display unit. In general, when the first predetermined area selection is equal to the size of the first display unit and the second predetermined area selection is equal to the size of the second display unit, it is possible to accurately detect a cascade transmission failure of the video stream. However, in such a manner, since the comparison between the pixels of the displayed image and the determination value in the entire display unit needs to be calculated, the consumed resources are too large and the efficiency of obtaining the detection result is low, the partial region of the display unit can be selected for calculation, so that the consumption of resources can be effectively saved, and the failure detection efficiency can be effectively improved.
As an alternative embodiment, detecting a failure of the cascade transmission of the video stream by the first display unit to the second display unit based on the first pixel number and the second pixel number may take various forms, for example, the following forms may be adopted: determining a first proportion of a first pixel number to all pixels of an image displayed in a first preset area, and determining a second proportion of a second pixel to all pixels of an image displayed in a second preset area; then, a failure of cascading the video stream from the first display unit to the second display unit is detected based on the first ratio and the second ratio. The probability of the pixel with the pixel value lower than the normal display judgment value can be obtained through the proportion of the pixel number with the pixel value smaller than the judgment value to all the pixels, so that the overall display condition of the pixel can be obtained objectively, and the accurate detection of the cascading transmission video stream faults is realized. It should be noted that, the proportion mode is only a preferred implementation mode for detecting the fault of the cascade transmission video stream, but is not the only mode, for example, the fault of the cascade transmission video stream can be simply detected directly according to the number of pixels with the pixel value smaller than the judgment value. For example, in the case where the number of first pixels in which the pixel value in the first display unit is smaller than the first determination value is significantly larger than the number of pixels in the second display unit and the pixel value in the second determination correction is smaller than the second determination correction, at this time, when the image displayed by the second display unit is significantly darker than the image displayed by the first display unit, that is, the video stream is transmitted from the first display unit to the second display unit, a transmission failure occurs, and it is possible to simply determine that the video stream is transmitted from the first display unit to the second display unit in cascade.
As an alternative embodiment, when detecting the failure of the cascade-transmitting video stream from the first display unit to the second display unit according to the first ratio and the second ratio, the manner of detecting the failure of the cascade-transmitting video stream may be different according to different settings of the first ratio and the second ratio. For example, the following preferred ways of detection may be employed: comparing whether the first ratio exceeds a first predetermined ratio and comparing whether the second ratio exceeds a second predetermined ratio; in the case that the comparison result is that the first proportion does not exceed the first predetermined proportion and the second proportion exceeds the second predetermined proportion, determining that the cascade transmission of the video stream from the first display unit to the second display unit is failed. It should be noted that the first predetermined ratio and the second predetermined ratio may be the same or different, depending on the specific video stream to be transmitted. In addition, the first predetermined ratio and the second predetermined ratio may be a higher value, so that a small failure of cascading the video stream from the first display unit to the second display unit can be effectively detected. Specifically, the values of the first predetermined ratio and the second predetermined ratio may be equal to or greater than 80%. It should be noted that, the values of the first predetermined ratio and the second predetermined ratio may be equal to or greater than 80% herein are merely examples, and may depend on specific fault detection targets. For example, when the fault detection is strict, the values of the first predetermined ratio and the second predetermined ratio may be set to be 90% or more each, or higher; while when the failure detection is slightly relaxed, the values of the first predetermined ratio and the second predetermined ratio may be set to be 70% or more, or lower, respectively.
As an alternative embodiment, in order to further improve the accuracy of detecting the fault, the multi-frame image of the detection area may be detected, for example, the image displayed in the first predetermined area in the first display unit includes: n frames of images of the video stream displayed in the first predetermined area, and the images displayed in the second predetermined area in the second display unit include: and displaying n frames of images of the video stream in a second preset area, wherein n is an integer greater than or equal to 2. By detecting the multi-frame images of the detection area, the detected data volume is increased, the fault detection accuracy is improved, and the false detection result caused by black or gray single-frame images can be effectively avoided.
Based on the above examples and preferred embodiments, a preferred embodiment is provided below.
In order to solve the above problems in the related art, in the preferred embodiment of the present application, taking a fault of video transmission of a display unit in an LED display screen as an example, according to application characteristics of cascade transmission of the display unit in the LED display screen, the problems of self-detection and fault repair of the video transmission system are perfected, so that the operation of the LED display screen is ensured to be stable and reliable.
The preferred embodiment of the present application improves the detection device in the related art, for example, increases the detection of content for the problem of abnormality in display content. It is therefore proposed that the detection of the content of a video stream transmitted in cascade in a display unit is one of the main contents of the present application. In addition, a method for detecting video stream content, for example, how to identify abnormal content and normal content is also an essential content of the present application.
The following describes a content detection method of a video stream in the present preferred embodiment:
the video stream is obtained by a frame-by-frame image according to a certain play frequency sequence, wherein each frame image comprises a plurality of pixels, for example, an image with 1920×1080 resolution comprises 1920×1080 pixels. The detection content is the pixel value of the detection area. For example, one detection area, three detection areas, five detection areas and nine detection areas are uniformly distributed at each position of the image, the size of each detection area is n×m (the size can be flexibly set), a judgment value P is preset for each detection area, the pixel values of all pixels of the detection areas are judged with the P in size, and the number of pixels smaller than the P value is calculated. Assuming that there are consecutive Q frames (e.g., q=16) of images, the number of pixels of the detection area in the Q frames is q×n×m. If the number of pixels smaller than the P value is 80% or more (preset value, 90% may be used), the judgment is 1, otherwise, the judgment is 0. If there are a plurality of areas, the judgment values of the plurality of areas are identified.
Each display unit makes a determination as described above, and a comparison of adjacent display units is made after the determination. Adjacent display units refer to front and rear display units in which video streams are directly transmitted. It should be noted that different video streaming topologies may define different adjacent display units, and if the front and rear values of the adjacent display units are found to be different, it proves that the cascade transmission of the video streams of the adjacent display units is problematic. For example, according to a general appearance phenomenon, if the determination value of the previous stage display unit is 0 and the determination value of the next stage display unit is 1, this means that the previous stage display unit is displayed normally, and the display of the next stage display unit becomes black or gray, that is, a video streaming abnormality occurs. It should be noted that there is a special case where if the normal image is black or gray, the determination values of the two-stage display units are all 1, and at this time, the video streaming is normal, and the display of the two-stage display units is also normal. For the normal case: the image is a normal image which is not black and not gray, and if the determination values of the two-stage display units are all 0, the video streaming is normal, and the display of the two-stage display units is also normal. In general, in the cascade transmission of video streams, a preceding stage delivers the video stream to a subsequent stage, and the subsequent stage delivers the above-described determination value to the preceding stage. The previous stage is responsible for comparing the decision with the decision value of its subsequent stage. For a large display screen with main and standby video streams, as the video stream transmission topological structure of the main signal is different from the video stream transmission topological structure of the standby signal, the video stream transmission methods are also different, so that the transmission directions are different. For the display unit, the decision it implements is the video stream that is in use.
The content detection method of the image solves the specific subdivision problem of the conventional cascade processing method in the related technology, and makes up the detection defect of the conventional processing scheme, so that cascade transmission is more stable and reliable.
In an embodiment of the present application, there is further provided a fault detection device, fig. 2 is a block diagram of a fault detection device provided according to an embodiment of the present application, and as shown in fig. 2, the fault detection device 200 includes: the first comparing module 202, the second comparing module 204 and the detecting module 206 are described below.
A first comparing module 202, configured to compare pixel values of all pixels of the image displayed in the first predetermined area in the first display unit with the first determination value, to obtain a first pixel number with the pixel value smaller than the first determination value; a second comparing module 204, configured to compare pixel values of all pixels of the image displayed in a second predetermined area in the second display unit with the second determination value to obtain a second pixel number with a pixel value smaller than the second determination value, where the video stream is transmitted by the first display unit to the second display unit in cascade, and the first predetermined area in the first display unit corresponds in position to the second predetermined area in the second display unit; the detection module 206, coupled to the first comparison module 202 and the second comparison module 204, is configured to detect a failure of cascade-transmitting the video stream from the first display unit to the second display unit according to the first pixel number and the second pixel number.
In an embodiment of the present application, there is further provided an LED display, and fig. 3 is a block diagram of the LED display provided according to the embodiment of the present application, as shown in fig. 3, the LED display 300 includes: a plurality of first display units 302, a plurality of second display units 304, and a fault detection device 200, wherein the fault detection device 200 is connected to the first display units 302 and the second display units 304, and is configured to compare pixel values of all pixels of an image displayed in a first predetermined area in the first display units with a first determination value to obtain a first pixel number having a pixel value smaller than the first determination value; comparing pixel values of all pixels of an image displayed in a second preset area in a second display unit with a second judging value to obtain a second pixel number with the pixel value smaller than the second judging value, wherein the video stream is transmitted to the second display unit in a cascade connection mode by the first display unit, and the first preset area in the first display unit corresponds to the second preset area in the second display unit in position; and detecting a failure in cascading the video stream from the first display unit to the second display unit based on the first number of pixels and the second number of pixels.
In an embodiment of the present application, a storage medium is further provided, where the storage medium includes a stored program, and when the program runs, the device where the storage medium is controlled to execute any one of the fault detection methods described above.
The foregoing embodiment numbers of the present application are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
In the foregoing embodiments of the present application, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed technology may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely a preferred embodiment of the present application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present application, which are intended to be comprehended within the scope of the present application.
Claims (8)
1. A fault detection method, comprising:
comparing pixel values of all pixels of an image displayed in a first predetermined area in a first display unit with a first judgment value to obtain a first pixel number of which the pixel values are smaller than the first judgment value;
comparing pixel values of all pixels of an image displayed in a second predetermined area in a second display unit with a second judging value to obtain a second pixel number with the pixel value smaller than the second judging value, wherein video streams are transmitted to the second display unit in a cascade manner by the first display unit, and the first predetermined area in the first display unit corresponds to the second predetermined area in the second display unit in position;
detecting a failure in cascade transmission of the video stream by the first display unit to the second display unit, based on the first number of pixels and the second number of pixels;
detecting a failure of cascade transmission of the video stream by the first display unit to the second display unit based on the first number of pixels and the second number of pixels, comprising:
determining a first proportion of the first pixel number to all pixels of the image displayed in the first predetermined area, and determining a second proportion of the second pixel to all pixels of the image displayed in the second predetermined area;
detecting a failure in cascading transmission of the video stream by the first display unit to the second display unit according to the first ratio and the second ratio;
detecting a failure of cascading transmission of the video stream by the first display unit to the second display unit according to the first ratio and the second ratio, comprising:
comparing whether the first ratio exceeds a first predetermined ratio and comparing whether the second ratio exceeds a second predetermined ratio;
and determining that the cascade transmission of the video stream from the first display unit to the second display unit is failed in the case that the first ratio does not exceed the first predetermined ratio and the second ratio exceeds the second predetermined ratio as a result of the comparison.
2. The method of claim 1, wherein the first predetermined proportion and the second predetermined proportion each have a value of 80% or more.
3. The method of claim 1, wherein displaying the image of the first predetermined area in the first display unit comprises: the n-frame image of the video stream displayed in the first predetermined area, the image displayed in the second predetermined area in the second display unit includes: and displaying n frames of images of the video stream in the second preset area, wherein n is an integer greater than or equal to 2.
4. The method of claim 1, wherein the first predetermined regions and the second predetermined regions are each m in number, and wherein m is an integer greater than or equal to 2.
5. The method of any one of claims 1 to 4, wherein the first display unit and the second display unit are each display units in a light emitting diode, LED, display.
6. A fault detection device, comprising:
a first comparing module, configured to compare pixel values of all pixels of an image displayed in a first predetermined area in a first display unit with a first determination value, to obtain a first pixel number having a pixel value smaller than the first determination value;
a second comparing module, configured to compare pixel values of all pixels of an image displayed in a second predetermined area in a second display unit with a second determination value to obtain a second pixel number with a pixel value smaller than the second determination value, where a video stream is transmitted by the first display unit to the second display unit in cascade, and the first predetermined area in the first display unit corresponds in position to the second predetermined area in the second display unit;
the detection module is used for detecting that the first display unit transmits the video stream fault to the second display unit in a cascading way according to the first pixel number and the second pixel number;
wherein, detection module is still used for:
determining a first proportion of the first pixel number to all pixels of the image displayed in the first predetermined area, and determining a second proportion of the second pixel to all pixels of the image displayed in the second predetermined area;
detecting a failure in cascading transmission of the video stream by the first display unit to the second display unit according to the first ratio and the second ratio;
comparing whether the first ratio exceeds a first predetermined ratio and comparing whether the second ratio exceeds a second predetermined ratio;
and determining that the cascade transmission of the video stream from the first display unit to the second display unit is failed in the case that the first ratio does not exceed the first predetermined ratio and the second ratio exceeds the second predetermined ratio as a result of the comparison.
7. An LED display, the LED display comprising: a plurality of first display units, a plurality of second display units, and a failure detection device, wherein,
the fault detection device is used for comparing pixel values of all pixels of the image displayed in a first preset area in the first display unit with a first judging value to obtain a first pixel number with the pixel value smaller than the first judging value; comparing pixel values of all pixels of an image displayed in a second preset area in a second display unit with a second judging value to obtain a second pixel number with the pixel value smaller than the second judging value, wherein video streams are transmitted to the second display unit in a cascade manner by the first display unit, and the first preset area in the first display unit corresponds to the second preset area in the second display unit in position; and detecting a cascade transmission of the video stream failure by the first display unit to the second display unit, based on the first number of pixels and the second number of pixels; wherein detecting a failure of cascade transmission of the video stream by the first display unit to the second display unit based on the first number of pixels and the second number of pixels, comprises: determining a first proportion of the first pixel number to all pixels of the image displayed in the first predetermined area, and determining a second proportion of the second pixel to all pixels of the image displayed in the second predetermined area; detecting a failure in cascading transmission of the video stream by the first display unit to the second display unit according to the first ratio and the second ratio; detecting a failure of cascading transmission of the video stream by the first display unit to the second display unit according to the first ratio and the second ratio, comprising: comparing whether the first ratio exceeds a first predetermined ratio and comparing whether the second ratio exceeds a second predetermined ratio; and determining that the cascade transmission of the video stream from the first display unit to the second display unit is failed in the case that the first ratio does not exceed the first predetermined ratio and the second ratio exceeds the second predetermined ratio as a result of the comparison.
8. A storage medium comprising a stored program, wherein the program, when run, controls a device in which the storage medium is located to perform the fault detection method of any one of claims 1 to 5.
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