CN111613162A - 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 invention discloses a fault detection method and device, an LED display and a storage medium. Wherein, the method comprises the following steps: comparing pixel values of all pixels of an image displayed in a first preset area in a first display unit with a first judgment value to obtain a first pixel number of which the pixel value is 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 judgment value to obtain a second pixel number with the pixel value smaller than the second judgment value, wherein the video stream is transmitted to the second display unit in a cascade mode through a 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 the fault of the video stream cascade transmission from the first display unit to the second display unit according to the first pixel number and the second pixel number. The invention solves the technical problem of abnormal display caused by abnormal content of the video stream in the related technology.
Description
Technical Field
The invention 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, a Light Emitting Diode (LED) display screen is a tiled display, that is, a complete LED display screen is formed by tiling a plurality of display units according to a certain sequence. The display unit and the display unit need to carry out cascade transmission of video data stream and communication data stream. Due to the fact that the LED display screen is multiple in application scenes and complex and diverse in electrical environment, the problem of video stream transmission faults is prone to exist, and therefore abnormal display is caused.
In the related art, in order to solve the above problem of display abnormality, a method is adopted in which the detecting device detects the video control signal, such as the field sync signal, the line sync signal, and the blanking signal, of the display unit to determine whether the video stream is correct or not in the display unit at this stage. When the video control signal is detected to be incorrect in the display unit of the current level, the reset of decoding is carried out on the video stream of the current level or the coding reset work of the display unit of the previous level is carried out, so that the cascade problem of video stream transmission is solved.
However, there are some disadvantages with the above-mentioned scheme, for example, first, although the scheme can solve the problem of cascading of most video streaming, it still cannot solve the problem of cascading of all video streaming. For example, the video control signals of the display unit of this level, such as field sync, line sync and blanking signal, are all correct, but the video content is incorrect, for example, there is a phenomenon in the field that the video stream content is not a correct picture but a gray or black content. In a complex and various electrical environment, the content of a video stream is interfered and a video control signal is intact, so that a decoder outputs black or gray content, namely, the current-stage unit and other normal display units display non-same frame images, and the whole LED display screen displays abnormity. Therefore, in the related art, there is a problem that the display abnormality is caused by the content abnormality of the video stream.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a fault detection method and device, an LED display and a storage medium, which are used for at least solving the technical problem of abnormal display caused by abnormal content of a video stream in the related technology.
According to an aspect of the embodiments of the present invention, there is provided a fault detection method, including: comparing pixel values of all pixels of an image displayed in a first preset area in a first display unit with a first judgment value to obtain a first pixel number of which the pixel value is 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 judgment value to obtain a second pixel number with the pixel value smaller than the second judgment value, wherein the video stream is transmitted to the second display unit by the first display unit in a cascade mode, 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 the video stream fault in cascade transmission from the first display unit to the second display unit according to the first pixel number and the second pixel number.
Optionally, the detecting the video stream failure cascade-transmitted from the first display unit to the second display unit according to the first pixel count and the second pixel count comprises: determining a first proportion of the first number of pixels to all pixels of the image displayed in the first predetermined area and determining a second proportion of the second number of pixels to all pixels of the image displayed in the second predetermined area; and detecting the video stream fault in cascade transmission from the first display unit to the second display unit according to the first proportion and the second proportion.
Optionally, detecting that the video stream fault is cascade-transmitted from the first display unit to the second display unit according to the first proportion and the second proportion comprises: 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 video stream fault is transmitted to the second display unit in a cascading mode by the first display unit when the first proportion does not exceed the first preset proportion and the second proportion exceeds the second preset proportion.
Optionally, the first predetermined ratio and the second predetermined ratio are all greater than or equal to 80%.
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 predetermined area, wherein n is an integer greater than or equal to 2.
Optionally, the number of the first predetermined area and the number of the second predetermined area 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 embodiments of the present invention, there is provided a fault detection apparatus including: the first comparison module is used for comparing pixel values of all pixels of an image displayed in a first preset area in the first display unit with a first judgment value to obtain a first pixel number of which the pixel value is smaller than the first judgment 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, and obtain a second pixel number with a pixel value smaller than the second determination value, where a video stream is transmitted in cascade from the first display unit to the second display unit, and a first predetermined area in the first display unit corresponds to a second predetermined area in the second display unit in position; and the detection module is used for detecting the video stream fault cascade transmission from the first display unit to the second display unit according to the first pixel number and the second pixel number.
According to a further aspect of an embodiment of the present invention, there is provided an LED display, wherein the 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 of which the pixel value is 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 judgment value to obtain a second pixel number with the pixel value smaller than the second judgment value, wherein the video stream is transmitted to the second display unit by the first display unit in a cascade mode, 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 the video stream fault in cascade transmission from the first display unit to the second display unit according to the first pixel number and the second pixel number.
According to a further aspect of the embodiments of the present invention, there is provided a storage medium, where the storage medium includes a stored program, and where the apparatus on which the storage medium is located is controlled to execute any one of the above-mentioned fault detection methods when the program runs.
In the embodiment of the invention, 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 judgment value to obtain the first pixel number of which the pixel value is 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 judgment value to obtain a second pixel number of which the pixel value is smaller than the second judgment value; and detecting the video stream fault in cascade transmission from the first display unit to the second display unit according to the first pixel number and the second pixel number, and achieving the purpose of detecting whether the content of the video stream in cascade transmission between the display units is faulty or not by comparing the pixel numbers smaller than a judgment value in the display units, thereby realizing the technical effect of effectively detecting the display content error of the display units and further solving the technical problem of abnormal display caused by abnormal content of the video stream in the related technology.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a flow chart of a fault detection method according to an embodiment of the invention;
fig. 2 is a block diagram of a fault detection apparatus provided according to an embodiment of the present invention;
fig. 3 is a block diagram of an LED display provided in accordance with an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or 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.
In accordance with an embodiment of the present invention, there is provided a method embodiment of a fault detection method, it should be noted that the steps illustrated in the flowchart of the figure may be performed in a computer system such as a set of computer executable instructions, and that while a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than that presented herein.
Fig. 1 is a flow chart of a fault detection method according to an embodiment of the present invention, as shown in fig. 1, the method including the steps of:
step S102, comparing pixel values of all pixels of an image displayed in a first preset area in a first display unit with a first judgment value to obtain a first pixel number of which the pixel value is smaller than the first judgment value;
step S104, comparing pixel values of all pixels of the image displayed in a second preset area in a second display unit with a second judgment value to obtain a second pixel number with the pixel value smaller than the second judgment value, wherein the video stream is transmitted to the second display unit by a first display unit in a cascade mode, 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 are not in sequence, and the step S102 may be executed first, and then the step S104 may be executed; step S104 may be executed first, and then step S102 may be executed, or step S102 and step S104 may be executed simultaneously.
And step S106, detecting the fault of the cascade transmission of the 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, comparing the pixel values of all pixels of the image displayed in the first preset area in the first display unit with the first judgment value to obtain a first pixel number of which the pixel value is smaller than the first judgment 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 of which the pixel value is smaller than the second judgment value; and detecting the fault of the video stream transmitted from the first display unit to the second display unit in a cascade mode 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 transmitted in the cascade mode among the display units is faulty or not, so that the technical effect of effectively detecting the display content error of the display units is achieved, and the technical problem that the display is abnormal due to the abnormal content of the video stream in the related technology is solved.
As an optional embodiment, the first display unit and the second display unit may be both display units in an LED display, that is, errors in display contents 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 the 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 the 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 a display screen, for example, display units divided by an 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 mode. It should be noted that the first display unit and the second display unit may be plural, and may be any one of the display units divided by the display screen. The terms "first" and "second" are used herein only to describe the cascading transmission of video streams 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, means that the first predetermined area and the second predetermined area are in the same position of the first display unit and the second display unit, respectively. For example, when the first display unit and the second display unit are each 6 × 6 matrix size, the first predetermined region may be a region included in the 1 st to 3 rd rows and 1 st to 3 rd columns of the first display unit, and the second predetermined region may be a region included in the 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 region on the first display unit and the position of the second predetermined region on the second display unit are the same. With such processing, since the obtained first pixel number and the second pixel number are respectively at the same position of the compared display unit, when detecting a failure in cascade-transmitting a video stream from the first display unit to the second display unit based on the first pixel number and the second pixel number, it is possible to make the detection of the failure more accurate.
As an alternative embodiment, in order to make the fault detection more accurate, or effectively avoid an error existing in a single detection, the number of the first predetermined area and the second predetermined area may also be multiple, 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 size of the second predetermined area may be flexibly set, for example, any area smaller than or equal to the size of the first display unit may be selected as the first predetermined area, and any area smaller than or equal to the size of the second display unit may be selected as the second predetermined area. Generally, 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, the cascade transmission failure of the video stream can be accurately detected. However, in such a method, since it is necessary to calculate the comparison between the pixels of the image displayed on the entire display unit and the determination value, the consumed resources are too large, and the efficiency of obtaining the detection result is low, and therefore, the partial region of the display unit can be selected and calculated, so that the resource consumption can be effectively reduced, and the failure detection efficiency can be effectively improved.
As an alternative embodiment, the detection of the failure of the cascade transmission of the video stream from the first display unit to the second display unit according to the first pixel count and the second pixel count may be performed in various manners, for example, the following manners may be adopted: determining a first proportion of a first pixel to all pixels of an image displayed in a first predetermined area, and determining a second proportion of a second pixel to all pixels of an image displayed in a second predetermined area; and then, according to the first proportion and the second proportion, detecting the fault of the cascade transmission of the video stream from the first display unit to the second display unit. The probability of the pixel with the pixel value lower than the normally displayed judgment value can be obtained through the proportion of the pixel number with the pixel value smaller than the judgment value in all the pixels, so that the integral display condition of the pixel can be objectively obtained, and the accurate detection of the cascade transmission video stream fault is realized. It should be noted that the proportional method is only one preferred implementation method for detecting the failure of the cascade-connected video stream, but is not the only method, and for example, the failure of the cascade-connected video stream can be simply detected directly according to the number of pixels whose pixel values are smaller than the determination value. For example, when the first number of pixels in the first display unit, the pixel value of which is smaller than the first determination value, is significantly larger than the second number of pixels in the second display unit, the second determination value, and the third determination value are different from each other.
As an alternative embodiment, when detecting a failure of a cascade-transport video stream from a first display unit to a second display unit according to a first ratio and a second ratio, the manner of detecting the failure of the cascade-transport video stream may also be different according to different settings of the first ratio and the second ratio. For example, the following preferred modes may be used for detection: comparing whether the first proportion exceeds a first predetermined proportion and comparing whether the second proportion exceeds a second predetermined proportion; and determining that the video stream is in cascade transmission failure from the first display unit to the second display unit when the comparison result shows that the first proportion does not exceed the first preset proportion and the second proportion exceeds the second preset proportion. 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 when a smaller failure occurs in the cascade transmission of the video stream from the first display unit to the second display unit, the failure can be effectively detected. Specifically, the first predetermined ratio and the second predetermined ratio may each be equal to or greater than 80%. It should be noted that, here, the values of the first predetermined ratio and the second predetermined ratio may be all greater than or equal to 80% merely as an example, and may be determined according to a specific fault detection target. 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 each equal to or greater than 90%, or higher; when the fault detection is slightly relaxed, the values of the first predetermined ratio and the second predetermined ratio may be set to be each equal to or greater than 70%, or lower.
As an alternative embodiment, in order to further improve the accuracy of detecting the fault, a plurality of frames of images of the detection area may be detected, for example, an 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 predetermined area, wherein n is an integer greater than or equal to 2. Through detecting the multiframe images of the detection area, the detected data volume is increased, the fault detection accuracy is improved, and the error detection result caused by black or gray single-frame images can be effectively avoided.
Based on the above-described embodiments 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 invention, by taking the failure of video transmission of the display unit in the LED display screen as an example, according to the application characteristics of cascade transmission of the display unit in the LED display screen, the self-detection and failure recovery problems of the video transmission system are improved, so as to ensure stable and reliable operation of the LED display screen.
The preferred embodiment of the invention improves the detection device in the related art, for example, aiming at the problem of abnormal display content, the detection of the content is increased. 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 the content of the video stream, for example, how to identify abnormal content and normal content is also a main content of the present application.
The following describes a method for detecting content of a video stream according to the present preferred embodiment:
the video stream is obtained from a frame-by-frame image according to a certain playing frequency sequence, wherein each frame image includes a plurality of pixels, for example, an image with a resolution of 1920 × 1080 includes 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, 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), each detection area is preset with a judgment value P, the pixel values of all pixels in the detection area and P are subjected to size judgment, and the number of pixels smaller than the P value is calculated. Assuming that there are continuous Q-frame (Q is 16, for example), the number of pixels in the Q-frame in the detection region is Q × N × M. If the number of pixels smaller than the P value is larger than or equal to 80% (preset value, configuration can be also 90%), the judgment is marked as 1, otherwise, the judgment is marked as 0. If there are several regions, the judgment values of the several regions are identified.
Each display element is determined in the manner described above, and the comparison of adjacent display elements is performed after the determination. The adjacent display units refer to front and rear display units in which the video stream is directly transmitted. It should be noted that different video stream transmission topologies may define different adjacent display units, and if the front and back 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 common occurrence 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, it means that the display of the previous-stage display unit is normal, and the display of the next-stage display unit is changed to a black or gray phenomenon, that is, an abnormality in video streaming transmission occurs. It should be noted that there is a special case where if a normal image is black or gray, the determination values of the two-level display units are both 1, and at this time, the video streaming is normal, and the display of the two-level display units is also normal. For the normal case: the image is a normal image which is not black and not gray, if the judgment values of the two-stage display units are both 0, the video streaming transmission is normal, and the display of the two-stage display units is normal. In general, in the cascade transmission of a video stream, a preceding stage transmits the video stream to a succeeding stage, and the succeeding stage transmits the determination value to the preceding stage. The former stage is responsible for the decision and the decision value comparison of the latter stage. For a large display screen with main and standby video streams, the video stream transmission topological structure of the main signal is different from that of the standby signal, so that the transmission methods of the video streams are different, and the transmission directions of the video streams are different. The decision that the display unit is implemented is the video stream that is in use.
The image content detection method provided by the preferred embodiment solves the specific subdivision problem of the conventional cascade processing method in the related technology, makes up the detection defect of the conventional processing scheme, and enables cascade transmission to be more stable and reliable.
In an embodiment of the present invention, a fault detection apparatus is further provided, and fig. 2 is a block diagram of a structure of the fault detection apparatus provided in the embodiment of the present invention, as shown in fig. 2, the fault detection apparatus 200 includes: a first comparing module 202, a second comparing module 204 and a detecting module 206, which will be described below.
A first comparing module 202, configured to compare pixel values of all pixels of an image displayed in a first predetermined area in the first display unit with a first determination value, to obtain a first pixel number whose pixel value is smaller than the first determination value; a second comparing module 204, 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, so as to obtain a second pixel number with a pixel value smaller than the second determination value, where the video stream is transmitted in cascade from the first display unit to the second 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; the detecting module 206 is connected to the first comparing module 202 and the second comparing module 204, and is configured to detect a failure of cascade transmission of the video stream from the first display unit to the second display unit according to the first pixel count and the second pixel count.
In an embodiment of the present invention, an LED display is further provided, and fig. 3 is a block diagram of a structure of an LED display according to an embodiment of the present invention, 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 failure detection device 200, wherein the failure detection device 200, connected to the first display units 302 and the second display units 304, 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 number of pixels having pixel values smaller than the first determination value; comparing pixel values of all pixels of the image displayed in a second preset 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, wherein the video stream is transmitted to the second display unit in a cascade mode through 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 video stream fault cascade-transmitted 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 invention, there is further provided a storage medium including a stored program, wherein when the program runs, a device in which the storage medium is located is controlled to execute any one of the above-mentioned fault detection methods.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
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 can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method of fault detection, comprising:
comparing pixel values of all pixels of an image displayed in a first preset area in a first display unit with a first judgment value to obtain a first pixel number of which the pixel value is 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 judgment value to obtain a second pixel number with the pixel value smaller than the second judgment value, wherein the video stream is transmitted to the second display unit by the first display unit in a cascade mode, 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 the video stream fault in cascade transmission from the first display unit to the second display unit according to the first pixel number and the second pixel number.
2. The method of claim 1, wherein detecting the video stream failure by the first display unit to cascade the second display unit based on the first pixel count and the second pixel count comprises:
determining a first proportion of the first number of pixels to all pixels of the image displayed in the first predetermined area and determining a second proportion of the second number of pixels to all pixels of the image displayed in the second predetermined area;
and detecting the video stream fault in cascade transmission from the first display unit to the second display unit according to the first proportion and the second proportion.
3. The method of claim 2, wherein detecting the cascade transmission of the video stream failure by the first display unit to the second display unit according to the first scale and the second scale comprises:
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 video stream fault is transmitted to the second display unit in a cascading mode by the first display unit when the first proportion does not exceed the first preset proportion and the second proportion exceeds the second preset proportion.
4. The method of claim 3, wherein the first predetermined ratio and the second predetermined ratio each have a value equal to or greater than 80%.
5. The method according to claim 1, wherein the image displayed in 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 predetermined area, wherein n is an integer greater than or equal to 2.
6. The method according to claim 1, wherein the number of the first predetermined regions and the number of the second predetermined regions are both m, and m is an integer greater than or equal to 2.
7. The method of any one of claims 1 to 6, wherein the first display unit and the second display unit are both display units in a Light Emitting Diode (LED) display.
8. A fault detection device, comprising:
the first comparison module is used for comparing pixel values of all pixels of an image displayed in a first preset area in the first display unit with a first judgment value to obtain a first pixel number of which the pixel value is smaller than the first judgment 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, and obtain a second pixel number with a pixel value smaller than the second determination value, where a video stream is transmitted in cascade from the first display unit to the second display unit, and a first predetermined area in the first display unit corresponds to a second predetermined area in the second display unit in position;
and the detection module is used for detecting the video stream fault cascade transmission from the first display unit to the second display unit according to the first pixel number and the second pixel number.
9. An 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 an image displayed in a first preset area in the first display unit with a first judgment value to obtain a first pixel number of which the pixel value is 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 judgment value to obtain a second pixel number with the pixel value smaller than the second judgment value, wherein the video stream is transmitted to the second display unit by the first display unit in a cascade mode, 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 the video stream fault in cascade transmission from the first display unit to the second display unit according to the first pixel number and the second pixel number.
10. A storage medium comprising a stored program, wherein the apparatus in which the storage medium is located is controlled to perform the fault detection method of any one of claims 1 to 7 when the program is run.
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