CN108737816A - A kind of black field detecting method of IPTV - Google Patents
A kind of black field detecting method of IPTV Download PDFInfo
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- CN108737816A CN108737816A CN201810379527.8A CN201810379527A CN108737816A CN 108737816 A CN108737816 A CN 108737816A CN 201810379527 A CN201810379527 A CN 201810379527A CN 108737816 A CN108737816 A CN 108737816A
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- block
- black field
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- detection zone
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/004—Diagnosis, testing or measuring for television systems or their details for digital television systems
Abstract
The present invention relates to the black field detecting methods of IPTV a kind of, including step：1, current video frame is read, the part of station symbol will be removed as detection zone；2, detection zone is divided into n*n sub-regions blocks, calculates the average gray value of each sub-regions block；3, Selection Center block and its average gray value；4, the difference of the absolute value of the average gray value of subregion block and central block is calculated, and is compared with the threshold value of setting, if difference is more than threshold value, the block number of subregion block is added 1, the block number for black field does not add 1, otherwise, the block number of subregion block is added 1；5, judge whether the block number of subregion block is equal to n*n, if so, execute next step, otherwise return to step 3；6, judge whether the block number as black field is not less than judgment value, if so, image is black field, execute warning operation, otherwise image is not black field.Compared with prior art, the present invention is simple and practicable, detection is accurate, speed is fast.
Description
Technical field
The present invention relates to electronic information technical fields, more particularly, to the black field detecting method of IPTV a kind of.
Background technology
Support energetically with government to the integration of three networks, the rise of internet, being played to people's daily life can not neglect
Depending on effect, user has been no longer satisfied with the viewing of ordinary tv programme, start requirement have abundanter video, content with
And other services, the appearance of IPTV largely meet the demand of user.User may when watching IPTV programs
The green screen phenomenon that the case where will appear picture unexpected blue screen or while watching video frequency program on PC occur, this is black field
Definition.Faced with this situation, broadcasting and TV supervision department needs to ensure the smooth expansion of IPTV service it is necessary to avoid such case
Occur, carries out the monitoring to IPTV system, prevent programme content from black field occurring suddenly, hold every one of outpost of the tax office.It is broadcast live in IPTV
In image in contain station symbol, when black field or frozen frame occurs, station symbol still has display, it is therefore desirable to exclude to exist by station symbol region
Outside, there is not the effective black field detecting method proposed for station symbol problem also at present.
Invention content
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide the black fields of IPTV a kind of to examine
Survey method.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of black field detecting method of IPTV, this approach includes the following steps：
1) current video frame of IPTV is read, one fixed area for being free of station symbol of setting removes current video frame solid
The part in region is determined as detection zone.
2) detection zone is divided into n*n sub-regions blocks, calculates the average gray value of each sub-regions block and storage.
3) central block that detection zone is selected in multiple subregion blocks, obtains the average gray value of central block.
4) difference of the absolute value of the average gray value of subregion block and central block is calculated, and by the threshold value of difference and setting
Threshold is compared, if difference is more than the threshold value Threshold of setting, by the block number of the subregion block of detection zone
Add 1, the block number for black field does not add 1, otherwise, the block number of the subregion block of detection zone is added 1.
5) judge whether the block number of the subregion block of detection zone is equal to n*n, if so, executing next step, otherwise, return to step
It is rapid 3).
6) judge whether the block number as black field is not less than judgment value, if so, image is black field, execute warning operation, it is no
Then, image is not black field.
7) terminate detection.
Preferably, the n is set as 8.
Preferably, the judgment value is set by the size of n values.
Preferably, the judgment value is 5.
Preferably, the value range of the threshold value Threshold is 11~26.
Preferably, the division of subregion block is to be carried out being divided into n*n blocks, and threshold value according to the size of detection zone
The size of Threshold can be selected according to actual conditions.
Compared with prior art, the present invention has the following advantages：
(1) simple and practicable：Whether the present invention is used would know that image for black field to the detection of the gray value of current video frame,
Detection process is simple and practicable；
(2) detection is accurate：The region for the video frame for removing station symbol is set as detection zone by the present invention, and by detection zone etc.
Divide piecemeal, judges come detection image whether to be black field by carrying out average gray value to each sub-regions block successively, judge
Cheng Zhong, given threshold and judgment value, improve the accuracy of detection the case where according to actually detected region；
(3) detection speed is high：Coloured image needs to use three bytes, and gray level image only needs a byte, this hair
The bright gray value to video image is analyzed, and while saving detection occupied resource, improves detection speed.
Description of the drawings
Fig. 1 is a kind of flow chart of the black field detecting method of IPTV.
Specific implementation mode
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
As shown in Figure 1, the present invention relates to the black field detecting method of IPTV a kind of, include the following steps：
Step 1: reading the current video frame of IPTV, one fixed area for being free of station symbol of setting removes current video frame
Go to the part of fixed area as detection zone；
Step 2: detection zone is divided into 8*8 sub-regions blocks, calculate the average gray value of each sub-regions block and is deposited
Storage；
Step 3: selecting the central block of detection zone in multiple subregion blocks, the average gray value of central block is obtained；
Step 4: calculate the difference of the absolute value of the average gray value of subregion block and central block, and by difference and setting
Threshold value Threshold is compared, if difference is more than the threshold value Threshold of setting, by the subregion block of detection zone
Block number adds 1, and the block number for black field does not add 1, executes next step；Otherwise, the block number of the subregion block of detection zone is added 1, executed
In next step；
Step 5: need to carry out 8*8=64 time because whole and judge, thus judge the subregion block of detection zone block number whether etc.
In 64, if so, next step is executed, otherwise, return to step three；
Step 6: judging whether the block number as black field is not less than 5, if so, image is black field, warning operation is executed, it is no
Then, image is not black field.
Step 7: terminating detection.
It should be noted that in step 4, the selecting sequence of subregion block is the central block from the detection zone being set
Position start, spread progress successively to the subregion block of adjacent surrounding, and the size of threshold value Threshold can be according to practical feelings
Condition selects.
Based on method proposed by the present invention, the present embodiment is tested, to doubtful black field in the IPTV videos of reading
10 frame images be tested, the threshold value of setting and the frame number of the black field detected are as shown in table 1.
The black field detecting result of 1 experiment test of table
By the data in table 1 it is known that different threshold values for setting, the frame number of detected black field is also
Difference, threshold value is too small, is also easy to produce the problems such as detection fails, and excessive threshold value is also possible to cause detection mistake.To this 10 frame
In the detection of image, occur the phenomenon that black field in order to prevent, and in order to improve the accuracy of detection, threshold value is set in 11~
26, the video frame images for detecting doubtful black field can be conducive to.It is of course also possible to according to specific actual conditions given threshold model
It encloses.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
The staff for being familiar with the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or replace
It changes, these modifications or substitutions should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with right
It is required that protection domain subject to.
Claims (5)
1. the black field detecting method of IPTV a kind of, which is characterized in that this approach includes the following steps：
S1：The current video frame of IPTV is read, current video frame is removed fixed area by one fixed area for being free of station symbol of setting
The part in domain is as detection zone；
S2：Detection zone is divided into n*n sub-regions blocks, calculates the average gray value of each sub-regions block and storage；
S3：The central block that detection zone is selected in multiple subregion blocks, obtains the average gray value of central block；
S4：The difference of the absolute value of the average gray value of subregion block and central block is calculated, and difference and the threshold value of setting are carried out
Compare, if difference is more than the threshold value of setting, the block number of the subregion block of detection zone is added 1, the block number for black field does not add 1,
Otherwise, the block number of the subregion block of detection zone is added 1；
S5：Judge whether the block number of the subregion block of detection zone is equal to n*n, if so, next step is executed, otherwise, return to step
S3；
S6：Judge whether the block number as black field is not less than judgment value, if so, image is black field, executes warning operation, otherwise,
Image is not black field；
S7：Terminate detection.
2. the black field detecting method of IPTV according to claim 1 a kind of, which is characterized in that the n is set as 8.
3. the black field detecting method of IPTV according to claim 1 a kind of, which is characterized in that the judgment value is by n values
Size set.
4. the black field detecting method of IPTV according to claim 1 a kind of, which is characterized in that the judgment value is 5.
5. the black field detecting method of IPTV according to claim 1 a kind of, which is characterized in that the value model of the threshold value
Enclose is 11~26.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810379527.8A CN108737816A (en) | 2018-04-25 | 2018-04-25 | A kind of black field detecting method of IPTV |
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| CN201810379527.8A CN108737816A (en) | 2018-04-25 | 2018-04-25 | A kind of black field detecting method of IPTV |
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| CN110213571A (en) * | 2019-06-13 | 2019-09-06 | 上海佰贝科技发展股份有限公司 | More monitoring point program real-time consistency assessment systems and method in a kind of broadcast link |
| CN113099220A (en) * | 2021-06-07 | 2021-07-09 | 全时云商务服务股份有限公司 | Video conference video image green screen detection method, system and storage medium |
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Application publication date: 20181102 |