CN113033292A - Display content detection method and system of LED display screen and client - Google Patents

Display content detection method and system of LED display screen and client Download PDF

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Publication number
CN113033292A
CN113033292A CN202110142072.XA CN202110142072A CN113033292A CN 113033292 A CN113033292 A CN 113033292A CN 202110142072 A CN202110142072 A CN 202110142072A CN 113033292 A CN113033292 A CN 113033292A
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China
Prior art keywords
picture set
client
display
display screen
time point
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Pending
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CN202110142072.XA
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Chinese (zh)
Inventor
黄广鸿
方明
黄达森
彭云
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Chainzone Technology Foshan Co Ltd
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Chainzone Technology Foshan Co Ltd
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Priority to CN202110142072.XA priority Critical patent/CN113033292A/en
Publication of CN113033292A publication Critical patent/CN113033292A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V20/00—Scenes; Scene-specific elements
    • G06V20/40—Scenes; Scene-specific elements in video content
    • G06V20/46—Extracting features or characteristics from the video content, e.g. video fingerprints, representative shots or key frames
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F18/00—Pattern recognition
    • G06F18/20—Analysing
    • G06F18/22—Matching criteria, e.g. proximity measures
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/0002—Inspection of images, e.g. flaw detection
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V20/00—Scenes; Scene-specific elements
    • G06V20/40—Scenes; Scene-specific elements in video content
    • G06V20/41—Higher-level, semantic clustering, classification or understanding of video scenes, e.g. detection, labelling or Markovian modelling of sport events or news items
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/10—Image acquisition modality
    • G06T2207/10016—Video; Image sequence

Abstract

The invention discloses a method for detecting display content of an LED display screen, which comprises the following steps: when the first preset time point is reached, the client starts a screen recording to start recording the video signal on the display screen of the client; when the second preset time point is reached, the client drives the camera shooting equipment to collect a display picture set on the LED display screen, then drives the camera shooting equipment to send the display picture set to the client, and preprocesses the display picture set to generate a display picture set; when the third preset time point is reached, the client ends screen recording to stop recording the video signals on the display screen of the client, and the recorded video signals are converted into a video picture set; and when the fourth preset time point is reached, the client detects the display picture set and the video picture set. The invention also discloses a display content detection system and a client of the LED display screen. By adopting the invention, the display content actually played by the LED display screen can be monitored, and the application reliability of the LED display screen is greatly improved.

Description

Display content detection method and system of LED display screen and client
Technical Field
The invention relates to the technical field of image processing, in particular to a display content detection method of an LED display screen, a client and a display content detection system of the LED display screen.
Background
In the image data transmission process of the LED display screen, image data needs to be transmitted to the LED display screen main board through the client, and then the LED display screen main board controls the LED module to display corresponding image data. These interferences can cause the final display effect of the LED display screen to be abnormal, which affects the normal image information transmission, and when these problems occur, the system cannot know them.
Therefore, the deviation between the actual playing content of the LED display screen and the content that is desired to be played is usually discovered by the operator or the maintenance personnel through inspection, and the method for finding the problem through manual mode has low efficiency and long delay, and brings bad experience to the advertiser and even loses advertising income.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method, a system and a client for detecting the display content of an LED display screen, which can monitor the display content actually played by the LED display screen and improve the reliability of the application of the LED display screen.
In order to solve the technical problem, the invention provides a method for detecting display content of an LED display screen, which comprises the following steps: when the first preset time point is reached, the client starts a screen recording to start recording the video signal on the display screen of the client; when a second preset time point is reached, the client drives the camera shooting equipment to collect a display picture set on the LED display screen, then drives the camera shooting equipment to send the display picture set to the client, and preprocesses the display picture set to generate a display picture set; when a third preset time point is reached, the client ends screen recording to stop recording the video signal on the display screen of the client, and the recorded video signal is converted into a video picture set; and when the fourth preset time point is reached, the client detects the display picture set and the video picture set.
As an improvement of the above scheme, a time difference between the first preset time point and the second preset time point is greater than a time delay generated when the video signal is sent to the LED display screen by the client; and before the third preset time point is reached, the camera equipment finishes the acquisition of the display picture set.
As an improvement of the above scheme, between the second preset time point and a fourth preset time point, the client records the video signal on the client display screen and preprocesses the display picture set.
As an improvement of the above solution, the step of preprocessing the display picture set to generate the display picture set includes: cutting the display picture set to cut out a display area of the LED display screen; and carrying out noise reduction processing on the display area to generate a display picture set.
As an improvement of the above scheme, the step of the client performing detection processing on the display picture set and the video picture set includes: screening the video picture set by adopting an average hash algorithm to screen out a target picture set with the highest similarity with the display picture set; extracting feature points of the display picture set and the target picture set by adopting a feature extraction algorithm; and comparing the similarity of the characteristic points of the display picture set and the target picture set to obtain a detection result.
As an improvement of the scheme, the client and the camera shooting device adopt the same time reference system, and time synchronization is performed at regular time.
Correspondingly, the invention also provides a client, which comprises: the screen recording module is used for starting a screen recording to start recording the video signals on the display screen of the client when a first preset time point is reached; the preprocessing module is used for driving the camera shooting equipment to collect a display picture set on the LED display screen when a second preset time point is reached, then driving the camera shooting equipment to send the display picture set to the client, and preprocessing the display picture set to generate a display picture set; the conversion module is used for ending screen recording to stop recording the video signals on the display screen of the client when a third preset time point is reached, and converting the recorded video signals into a video picture set; and the detection module is used for detecting the display picture set and the video picture set when a fourth preset time point is reached.
As an improvement of the above scheme, the preprocessing module includes: the acquisition unit is used for driving the camera shooting equipment to acquire a display picture set on the LED display screen; a sending unit configured to drive the image pickup apparatus to send the display screen set to the client; the cutting unit is used for cutting the display picture set to cut out the display area of the LED display screen; and the noise reduction unit is used for performing noise reduction processing on the display area so as to generate a display picture set.
As an improvement of the above solution, the detection module includes: the screening unit is used for screening the video picture set by adopting an average hash algorithm so as to screen out a target picture set with the highest similarity with the display picture set; the extraction unit is used for extracting the feature points of the display picture set and the target picture set by adopting a feature extraction algorithm; and the comparison unit is used for comparing the similarity of the characteristic points of the display picture set and the target picture set to obtain a detection result.
Correspondingly, the invention also provides a display content detection system of the LED display screen, which comprises the LED display screen, the camera equipment and the client; the LED display screen is connected with a client and used for playing a video signal sent by the client; the camera shooting equipment is connected with the client and arranged in front of the LED display screen and used for collecting a display picture set on the LED display screen.
The implementation of the invention has the following beneficial effects:
aiming at a special scene that the LED display screen plays videos, time nodes are strictly controlled, and a brand-new processing strategy is established, so that synchronous acquisition of client video signals and display pictures of the LED display screen is realized, and the video signals and the display pictures are conveniently and accurately compared;
meanwhile, the invention also adopts an optimized image processing strategy (such as preprocessing, conversion processing and detection processing), quickly identifies whether the display content actually played by the LED display screen has errors through quick positioning and comparative analysis of the characteristic points, quickly reports the errors to an operation team, avoids the problem that the problems can only be found by manual inspection, and greatly improves the application reliability of the display screen.
Drawings
FIG. 1 is a flowchart of an embodiment of a method for detecting display content of an LED display screen according to the present invention;
FIG. 2 is a diagram illustrating a relationship between a first predetermined time point, a second predetermined time point and a time delay according to the present invention;
FIG. 3 is a schematic diagram of a relationship between display images and corresponding feature points of a target image according to the present invention;
FIG. 4 is a timing diagram illustrating a method for detecting display content of an LED display screen according to the present invention;
FIG. 5 is a schematic diagram of a display content detection system of an LED display screen according to the present invention;
FIG. 6 is a schematic diagram of the client in the present invention;
FIG. 7 is a schematic diagram of the pre-processing module of the present invention;
FIG. 8 is a schematic structural diagram of a detection module according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 shows a flowchart of an embodiment of a method for detecting display content of an LED display screen according to the present invention, including:
s101, when the first preset time point is reached, the client starts a screen recording screen to start recording the video signal on the display screen of the client.
The client is also called a PC (personal computer) end. In practical application, the client can directly play video signals, and simultaneously, the video signals can be transmitted to the LED display screen mainboard, and the LED display screen is controlled by the LED display screen mainboard to display.
When the display content of the LED display screen needs to be detected, the client can start the screen recording function at a first preset time point while playing the video signal, wherein the recorded area is the area played by the client on the display screen of the client.
And S102, when a second preset time point is reached, the client drives the camera shooting equipment to collect a display picture set on the LED display screen, then drives the camera shooting equipment to send the display picture set to the client, and preprocesses the display picture set to generate a display picture set.
Because there is a time delay when the video signal is transmitted from the client to the LED display screen, the time point when the client records the screen and the time point when the image pickup device collects the display picture set need to be controlled, so as to ensure that the display picture set collected by the image pickup device can find the corresponding video image in the recorded video signal.
As shown in fig. 2, a time difference D between the first predetermined time point T1 and the second predetermined time point T2TThe time delay generated when the video signal is sent to the LED display screen by the client is less than the time delay generated when the video signal is sent to the LED display screen by the client, and the display picture set collected by the camera equipment does not exist in the recorded video signal; a time difference D between the first predetermined time point T1 and a second predetermined time point T2TAnd if the time delay is larger than the time delay generated when the video signal is sent to the LED display screen by the client, the display picture set acquired by the camera equipment exists in the recorded video signal.
Therefore, in order to ensure that the display picture set acquired by the camera device can find the corresponding video image in the recorded video signal, the time difference between the first preset time point and the second preset time point is greater than the time delay generated when the video signal is sent to the LED display screen by the client.
In addition, the display images collected by the camera equipment are concentrated, and the whole LED display screen needs to be included in each display image and is clear as much as possible.
It should be noted that, the LED display screen is used as a light-emitting object, and when the conventional camera device is used to identify the display content of the LED display screen, it is found that the extracted display image is blurred, and in addition, the LED display screen plays a dynamic video, and the influence of the refresh rate is also included, so that it is difficult to acquire a clear display image. Meanwhile, the invention needs to overcome the problem of the lamp tube of the LED display screen, and also needs to consider the influence of external environmental factors on the imaging (such as halation caused by the irradiation of sunlight on the LED display screen, local shadow shielded by a big tree, high-brightness LED display screen under strong light, and the like).
Specifically, the step of preprocessing the display picture set to generate the display picture set includes:
(1) cutting the display picture set to cut out a display area of the LED display screen;
and cutting the acquired display pictures into rectangular areas as small as possible one by one so that the rectangular areas can be just matched with the display areas of the LED display screen.
(2) And carrying out noise reduction processing on the display area to generate a display picture set.
Because gaps exist among the LED lamps in the LED display screen, black noise exists in the collected display picture.
And performing noise reduction processing on the cut display area to remove black noise points in the display area.
Therefore, the invention can effectively remove the interference generated by the luminous object and form a clear display picture set.
And S103, when the third preset time point is reached, the client ends screen recording to stop recording the video signal on the display screen of the client, and the recorded video signal is converted into a video picture set.
And after the client finishes recording the screen, converting all data frames in the recorded video signal into video pictures respectively to form a video picture set.
The client end finishes screen recording at a third preset time point, so that the camera device finishes the acquisition of the display picture set before the third preset time point in order to ensure that the display picture set acquired by the camera device can find a corresponding video image in the recorded video signal.
And S104, when the fourth preset time point is reached, the client detects the display picture set and the video picture set.
Before reaching the fourth preset time point, it is required to ensure that the preprocessing of the display frame set is completed, and then trigger the detection processing, wherein, when the preprocessing operation in step S102 is performed, step S103 may be performed synchronously.
That is to say, between the second preset time point and the fourth preset time point, the client takes the video signal on the display screen of the client and preprocesses the display picture set at the same time, so that parallel processing of two functions is realized, and the processing efficiency is effectively improved.
Specifically, the step of the client performing detection processing on the display picture set and the video picture set includes:
(1) screening the video picture set by adopting an Average Hash Algorithm (AHASH) to screen out a target picture set with the highest similarity with the display picture set;
and comparing the display pictures with the video pictures in the video picture set one by one, and screening out the video picture with the highest similarity with the display picture set as a target picture. And after the screening is finished, the display pictures in the display picture set correspond to the target pictures in the target picture set one by one.
(2) Extracting feature points of the display picture set and the target picture set by adopting a feature extraction algorithm;
(3) and comparing the similarity of the characteristic points of the display picture set and the target picture set to obtain a detection result.
As shown in fig. 3, the display picture and the corresponding target picture are compared with each other for one-to-one feature point, and a detection result is generated according to the comparison result.
For example, if the feature points of 10 consecutive display pictures are 100% similar to the feature points of the corresponding target picture, the display content of the LED display screen may be considered normal;
for another example, if the feature points of 10 consecutive display pictures are similar to 90% of the feature points of the corresponding target picture, and the 10% dissimilar feature points are changed regularly, it can be considered that a moving object appears on the LED display screen, and the display content of the LED display screen is normal;
for another example, if the feature points of the first 5 display pictures are similar to 60% of the feature points of the corresponding target picture, and the feature points of the last 5 display pictures are similar to 100% of the feature points of the corresponding target picture in the 10 consecutive display pictures; the LED display screen may be considered to be temporarily blocked, and the display content of the LED display screen is normal.
For another example, if the feature points of 10 consecutive display pictures are similar to the feature points of the corresponding target picture by 50%, and the dissimilar feature points do not change, it may be determined that the display content of the LED display screen is abnormal.
It should be noted that the specific detection logic is not specifically limited in the present invention, and may be adjusted according to actual situations.
According to the method, aiming at the special scene that the LED display screen plays the video, time nodes are strictly controlled, and a brand new processing strategy is established, so that the effective detection of the display content is realized; meanwhile, by optimizing image processing strategies (such as preprocessing, conversion processing and detection processing), by quickly positioning and contrastively analyzing the characteristic points, whether the display content actually played by the LED display screen is wrong or not can be quickly identified and reported to an operation team, the problem that the problem can be found only by manual inspection is avoided, and the application reliability of the display screen is greatly improved.
The invention is described in further detail below in conjunction with specific timing diagrams.
In order to ensure the accuracy of time, the client and the image capturing apparatus adopt the same time reference system, and perform time synchronization at regular time.
As shown in fig. 4, since there is a time delay when the video signal is transmitted from the client to the LED display screen, it is necessary to control a time point when the client starts recording, a time point when the client closes recording, a time point when the image capturing device collects a display image set, and a time point when the client starts performing detection processing. Specifically, the method comprises the following steps:
and before reaching the third preset time point, the camera equipment needs to finish the acquisition of the display picture set, so that the display picture set acquired by the camera equipment can find a corresponding video image in the recorded video signal.
And between the second preset time point and the fourth preset time point, the client side records the video signal on the display screen of the client side and simultaneously preprocesses the display picture set so as to realize the parallel processing of two functions and effectively improve the processing efficiency.
As shown in fig. 5, the display content detection system 100 of the LED display screen of the present invention includes an LED display screen 2, an image capturing device 3, and a client 1, specifically:
the LED display screen 2 is connected with the client 1 and used for playing the video signal sent by the client 1.
The camera device 3 is connected with the client 1 and arranged in front of the LED display screen 2 and used for collecting a display picture set on the LED display screen 2.
As shown in fig. 6, the client 1 includes:
and the screen recording module 11 is configured to start a screen recording to start recording a video signal on the display screen of the client when a first preset time point is reached. The recorded area is the area played by the client on the display screen of the client.
And the preprocessing module 12 is configured to drive the camera device to acquire a display image set on the LED display screen when a second preset time point is reached, drive the camera device to send the display image set to the client, and preprocess the display image set to generate a display image set. The display images collected by the camera equipment are concentrated, and the whole LED display screen needs to be included in each display image and is clear as much as possible.
And the conversion module 13 is configured to end screen recording to stop recording the video signal on the client display screen when a third preset time point is reached, and convert the recorded video signal into a video picture set. And after the client finishes recording the screen, converting all data frames in the recorded video signal into video pictures respectively to form a video picture set.
And the detection module 14 is configured to detect the display picture set and the video picture set when a fourth preset time point is reached.
As shown in fig. 7, the preprocessing module 12 includes:
and the acquisition unit 121 is used for driving the camera shooting equipment to acquire a display picture set on the LED display screen.
A sending unit 122, configured to drive the image capturing apparatus to send the display screen set to the client.
And the cutting unit 123 is configured to perform cutting processing on the display picture set to cut out the display area of the LED display screen. Specifically, the collected display pictures are cut into rectangular areas as small as possible one by one, so that the rectangular areas can be just matched with the display areas of the LED display screens.
And the denoising unit 124 is configured to perform denoising processing on the display area to generate a display picture set. It should be noted that, because there is a gap between the LED lamps in the LED display screen, black noise exists in the collected display image. Therefore, the noise reduction processing is performed on the display region obtained after cutting, and the black noise in the display region is removed.
Therefore, the interference generated by the light-emitting object can be effectively removed through the preprocessing module 12, and a clear display picture set is formed.
As shown in fig. 8, the detection module 14 includes:
the screening unit 141 is configured to perform screening processing on the video picture set by using an average hash algorithm to screen out a target picture set with the highest similarity to the display picture set. And comparing the display pictures with the video pictures in the video picture set one by one, and screening out the video picture with the highest similarity with the display picture set as a target picture. And after the screening is finished, the display pictures in the display picture set correspond to the target pictures in the target picture set one by one.
And an extracting unit 142, configured to extract feature points of the display image set and the target image set by using a feature extraction algorithm.
And the comparing unit 143 is configured to compare the feature point similarities of the display image set and the target image set to obtain a detection result. As shown in fig. 3, the display picture and the corresponding target picture are compared with each other for one-to-one feature point, and a detection result is generated according to the comparison result.
Therefore, the LED display screen has a simple structure and strong practicability, can quickly identify whether the display content actually played by the LED display screen is wrong or not, quickly reports the display content to an operation team, avoids the problem that the problem can only be found by manual inspection, and greatly improves the application reliability of the LED display screen.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (10)

1. A display content detection method of an LED display screen is characterized by comprising the following steps:
when the first preset time point is reached, the client starts a screen recording to start recording the video signal on the display screen of the client;
when a second preset time point is reached, the client drives the camera shooting equipment to collect a display picture set on the LED display screen, then drives the camera shooting equipment to send the display picture set to the client, and preprocesses the display picture set to generate a display picture set;
when a third preset time point is reached, the client ends screen recording to stop recording the video signal on the display screen of the client, and the recorded video signal is converted into a video picture set;
and when the fourth preset time point is reached, the client detects the display picture set and the video picture set.
2. The method for detecting the display content of the LED display screen according to claim 1,
the time difference between the first preset time point and the second preset time point is larger than the time delay generated when the video signal is sent to the LED display screen by the client;
and before the third preset time point is reached, the camera equipment finishes the acquisition of the display picture set.
3. The method as claimed in claim 1, wherein between the second predetermined time point and a fourth predetermined time point, the client takes the video signal from the client display screen and preprocesses the display frame set.
4. The method for detecting the display content of the LED display screen according to claim 1, wherein the step of preprocessing the display picture set to generate the display picture set comprises:
cutting the display picture set to cut out a display area of the LED display screen;
and carrying out noise reduction processing on the display area to generate a display picture set.
5. The method for detecting the display content of the LED display screen according to claim 1, wherein the step of the client performing the detection process on the display picture set and the video picture set comprises:
screening the video picture set by adopting an average hash algorithm to screen out a target picture set with the highest similarity with the display picture set;
extracting feature points of the display picture set and the target picture set by adopting a feature extraction algorithm;
and comparing the similarity of the characteristic points of the display picture set and the target picture set to obtain a detection result.
6. The method for detecting the display content of the LED display screen according to claim 1, wherein the client and the camera device use the same time reference system and are timed to perform time synchronization.
7. A client, comprising:
the screen recording module is used for starting a screen recording to start recording the video signals on the display screen of the client when a first preset time point is reached;
the preprocessing module is used for driving the camera shooting equipment to collect a display picture set on the LED display screen when a second preset time point is reached, then driving the camera shooting equipment to send the display picture set to the client, and preprocessing the display picture set to generate a display picture set;
the conversion module is used for ending screen recording to stop recording the video signals on the display screen of the client when a third preset time point is reached, and converting the recorded video signals into a video picture set;
and the detection module is used for detecting the display picture set and the video picture set when a fourth preset time point is reached.
8. The client of claim 7, wherein the pre-processing module comprises:
the acquisition unit is used for driving the camera shooting equipment to acquire a display picture set on the LED display screen;
a sending unit configured to drive the image pickup apparatus to send the display screen set to the client;
the cutting unit is used for cutting the display picture set to cut out the display area of the LED display screen;
and the noise reduction unit is used for performing noise reduction processing on the display area so as to generate a display picture set.
9. The client of claim 7, wherein the detection module comprises:
the screening unit is used for screening the video picture set by adopting an average hash algorithm so as to screen out a target picture set with the highest similarity with the display picture set;
the extraction unit is used for extracting the feature points of the display picture set and the target picture set by adopting a feature extraction algorithm;
and the comparison unit is used for comparing the similarity of the characteristic points of the display picture set and the target picture set to obtain a detection result.
10. A display content detection system of an LED display screen, comprising an LED display screen, a camera device and the client according to any one of claims 7 to 9;
the LED display screen is connected with a client and used for playing a video signal sent by the client;
the camera shooting equipment is connected with the client and arranged in front of the LED display screen and used for collecting a display picture set on the LED display screen.
CN202110142072.XA 2021-02-02 2021-02-02 Display content detection method and system of LED display screen and client Pending CN113033292A (en)

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Application Number Priority Date Filing Date Title
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108509127A (en) * 2018-03-29 2018-09-07 腾讯科技（深圳）有限公司 Start the method, apparatus and computer equipment of record screen task
CN109286829A (en) * 2018-09-10 2019-01-29 杭州联驱科技有限公司 Display screen play system, display screen examination device and inspection method
CN110337035A (en) * 2019-07-26 2019-10-15 新华三大数据技术有限公司 A kind of method and device detecting video playing quality

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108509127A (en) * 2018-03-29 2018-09-07 腾讯科技（深圳）有限公司 Start the method, apparatus and computer equipment of record screen task
CN109286829A (en) * 2018-09-10 2019-01-29 杭州联驱科技有限公司 Display screen play system, display screen examination device and inspection method
CN110337035A (en) * 2019-07-26 2019-10-15 新华三大数据技术有限公司 A kind of method and device detecting video playing quality

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