CN106686372A - Display terminal image display detection method and display terminal - Google Patents
Display terminal image display detection method and display terminal Download PDFInfo
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- CN106686372A CN106686372A CN201510767759.7A CN201510767759A CN106686372A CN 106686372 A CN106686372 A CN 106686372A CN 201510767759 A CN201510767759 A CN 201510767759A CN 106686372 A CN106686372 A CN 106686372A
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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
Abstract
The invention discloses a display terminal image display detection method, which comprises the following steps: 1) shooting an image being displayed by a display terminal; 2) carrying out pre-optimization processing on the obtained shot image; 3) carrying out image similarity comparison on the processed shot image and an original image of the shot image to judge whether the image display function of the display terminal is normal; and 4) displaying the judgment result in time. The disclosed display terminal image display detection method and the display terminal can automatically detect the image displayed and played on the display terminal and judge whether the image display function of the display terminal is normal without whole-course participation and detection of a user, so that a lot of precious time can be saved, and product using experience of the user for the display terminal is ensured.
Description
Technical field
The present invention relates to technical field of electric appliances, the detection method that more particularly to a kind of display terminal image shows
And its display terminal.
Background technology
With the continuous development of China's science and technology, display, projecting apparatus, all-in-one, computer, TV
The domestic electric appliances such as machine, video camera, camera are increasingly popularized in people's daily life, are had become
The indispensable part of people's life.
At present, for display terminals such as the television set with menu display function, computer displays, generally
Need to detect the image display function of display terminal, to judge that the image display function of display terminal is
No exception, existing problems.And traditional detection method, need the display terminals such as the whole viewing television set of user
The image for showing is played, it is then whether abnormal to judge the image display function of display terminal with subjective feeling.
Therefore, not only need user to participate in the overall process detection, waste user's substantial amounts of time, and cannot ensure to aobvious
The Detection results for showing the image display function of terminal (are such as difficult to differentiate between image and show that it is display terminal to go wrong
Vision signal problem of the display failure problems or outside input of itself to display terminal), it is impossible to meet user
Real work and living needs, badly influence the product use feeling of user.
Therefore, at present in the urgent need to developing a kind of display terminal, it can automatically to playing on display terminal
The image of display is detected whether extremely to judge the image display function of display terminal, whole without the need for user
Detection is participated in, a large amount of valuable times of user can be saved, it is ensured that product use feeling of the user to display terminal
Receive, offer convenience to the work and life of user.
The content of the invention
In view of this, it is an object of the invention to provide the detection method that shows of a kind of display terminal image and its aobvious
Show terminal, it can be automatically to playing display image on display terminal is detected, it is quick to judge to show eventually
Whether the image display function at end is abnormal, improves accuracy rate, participates in the overall process detection without the need for user, can save
The a large amount of valuable times of user, it is ensured that product use feeling of the user to display terminal, to user work and
Life offers convenience, and is conducive to strengthening the quality of the life of user, is of great practical significance.
For this purpose, the invention provides a kind of detection method that shows of display terminal image, comprises the following steps：
The first step：Shoot the image that display terminal is showing；
Second step：Shooting image to being obtained carries out pre-optimized process；
3rd step：The original image of treated shooting image and the shooting image is carried out into image similarity
Relatively, judge whether the image display function of the display terminal is abnormal；The original image is to show eventually
Before end shows, decoded by the outer video signal for receiving display terminal and obtained；
4th step：The judged result is shown in real time.
Wherein, in second step, the pre-optimized of the shooting image to being obtained processes operation and is specially：
Remove noise processed.
Wherein, in the third step, when image similarity is less than default Similarity value, described display eventually is judged
The image display function exception at end, and when image similarity is equal to or more than default Similarity value, judge
The image display function of the display terminal is normal.
Wherein, the 3rd step specifically includes following sub-step：
A) shooting image and original image are carried out respectively pre-set image process, is obtained respectively corresponding
The string of binary characters of presetting digit capacity；
B the difference digit of the string of binary characters of the two image presetting digit capacities) is compared, if difference digit
When the ratio for accounting for presetting digit capacity is more than 1 with the default Similarity value sum, then judge that image similarity is less than
Default Similarity value, the image display function exception of the display terminal；, whereas if difference digit accounts for pre-
If the ratio of digit is less than or equal to 1 with the default Similarity value sum, then image similarity is judged
Equal to or more than default Similarity value, the image display function exception of the display terminal.
Wherein, step A) comprise the following steps：
Default size is processed into for shooting image to be processed or original image, scaling is needed；
Then gray proces are carried out, the gray value of each pixel in the shooting image or original image is obtained；
Obtain the average gray value of whole pixels in the shooting image or original image；
The gray value of each pixel is compared with the average gray value, more than or equal to the average ash
Angle value, then be recorded as binary one, and is less than the average gray value, then be recorded as Binary Zero；
All comparative results are combined, obtain shooting image or original image all pixels point two enter
Character string processed.
Additionally, present invention also offers a kind of display terminal, including：
Image capturing unit, for shooting the image that display terminal is showing；
Pretreatment unit, is connected with image capturing unit, for the shooting obtained to image capturing unit
Image carries out pre-optimized process；
Image decoding unit, for before display terminal shows, the outer video signal that display terminal is received
Decoded and obtained the original image of the shooting image；
Abnormality detecting unit, is connected respectively with pretreatment unit, image decoding unit, for will be through institute
The shooting image and described image decoding unit for stating pretreatment unit process decodes the original image for obtaining and carries out figure
As similarity-rough set, whether extremely judge the image display function of the display terminal, when image similarity it is low
When default Similarity value, the image display function exception of the display terminal is judged, and work as image similarity
During equal to or more than default Similarity value, judge that the image display function of the display terminal is normal, and will
Judgment result displays are to image-display units；
Image-display units, are connected with abnormality detecting unit, send for receiving the abnormality detecting unit
The display terminal the whether abnormal judged result of image display function, and show in real time.
Wherein, described image shooting unit is camera, and described image decoding unit is video signal decoder.
Wherein, the pretreatment unit is used to the shooting image that obtains image capturing unit and is removed make an uproar
Sonication.
Wherein, the abnormality detecting unit specifically includes following subelement：
Pre-set image processes subelement, for the shooting image and original image to be carried out respectively pre-set image
Process, the string of binary characters of corresponding presetting digit capacity is obtained respectively；
Image comparing subunit, for comparing the difference position of the string of binary characters of the two image presetting digit capacities
Number, if difference digit accounts for the ratio of presetting digit capacity when being more than 1 with the default Similarity value sum, sentences
Disconnected image similarity is less than default Similarity value, the image display function exception of the display terminal；Conversely,
If difference digit accounts for the ratio of presetting digit capacity when being less than or equal to 1 with the default Similarity value sum,
Then judge that image similarity is equal to or more than default Similarity value, the image display function of the display terminal
It is abnormal, and will determine that result is shown to image-display units.
Wherein, the pre-set image processes subelement and specifically includes with lower module：
Image scaling module, for for need shooting image to be processed or original image, scaling to be processed into pre-
If size；
Gradation processing module, is connected with image scaling module, for the shooting image after scaling or original
Image carries out gray proces, obtains the gray value of each pixel in the image, and calculates the acquisition shooting figure
The average gray value of whole pixels, is then output to gray scale comparing unit in picture or original image；
Gray scale comparison module, is connected with gradation processing module, for by the gray value of each pixel with should
Average gray value is compared, and more than or equal to the average gray value, is then recorded as binary one, and little
In the average gray value, then Binary Zero is recorded as, and each comparative result is exported gives comparative result shape
Into module；
Comparative result forms module, is connected with gray scale comparison module, for send gray scale comparison module
All comparative results are combined, and obtain the default position of all pixels point in the shooting image or original image
Several strings of binary characters.
The technical scheme that the present invention is provided from more than, compared with prior art, the invention provides one
Detection method and its display terminal that display terminal image shows are planted, it can automatically to playing on display terminal
The image of display is detected that quickly judge whether the image display function of display terminal is abnormal, raising is accurate
Rate, participates in the overall process detection without the need for user, can save a large amount of valuable times of user, it is ensured that user is to showing
The product use feeling of terminal, offers convenience to the work and life of user, is conducive to strengthening the life of user
Quality, is of great practical significance.
Description of the drawings
The flow chart of the detection method that Fig. 1 shows for a kind of display terminal image that the present invention is provided；
A kind of structural representation of display terminal that Fig. 2 is provided for the present invention.
Specific embodiment
In order that those skilled in the art more fully understand the present invention program, below in conjunction with the accompanying drawings and embodiment party
The present invention is described in further detail for formula.
Referring to Fig. 1, the invention provides the detection method that a kind of display terminal image shows, including following step
Suddenly：
Step S101：Shoot the image that display terminal is showing；
Step S102：Shooting image to being obtained carries out pre-optimized process；
Step S103：By treated shooting image and the picture (image that i.e. display terminal is showing)
Original image carry out image similarity comparison, judge that the image display function of the display terminal is whether abnormal,
When image similarity is less than default Similarity value, the image display function exception of the display terminal is judged,
And when image similarity is equal to or more than default Similarity value (explanation similarity is high, much like), judge
The image display function of the display terminal is normal；The original image is before display terminal shows, to pass through
The outer video signal that display terminal is received is decoded and is obtained；
Step S104：The judged result is shown in real time.
In the present invention, the display terminal can include that display and all-in-one etc. are any with picture
The device of display function.
In the present invention, in step S101, implement, can be by being connected with display terminal
Camera shooting the image that display terminal is showing, be then transferred to display terminal.
In the present invention, in step S101, implement, video signal decoder pair can be passed through
The outer video signal that display terminal is received is decoded, and obtains the original image before display terminal shows.
If the display terminal is television set, the external video that can be received display terminal by television decoder
Signal is decoded, and obtains the original image before display terminal shows.
In the present invention, in step s 102, the shooting image to being obtained carries out the mesh of pre-optimized process
Be to remove unrelated information in the shooting image, recover useful information, strengthen the accuracy that image compares,
While maximized simplified data.
It should be noted that for the shooting image obtained captured by camera, can be due to image capture environment
Difference, the such as quality of illumination bright-dark degree and equipment performance often there are noise, the noise meeting
Identification to after is interfered, so needing first to pre-process picture, removes noise.For step
S102, the pretreatment operation specifically can include：Remove noise processed.Implement, can pass through
Gaussian filtering is being removed noise processed.
For the present invention, it should be noted that the present invention is based on the similarity compared between two width images come real
Existing abnormality detection, if similarity is less than certain default threshold value, that is, thinks that the tested altimetric image is occurred in that
It is abnormal.Similarity has various computational methods.The invention provides a kind of key technology is called " perceive hash algorithm "
(Perceptual hash algorithm), the advantage of this algorithm is simple and quick, is not scaled by picture size
Impact.First one is generated to every pictures " fingerprint " (fingerprint) character string is then more different
The fingerprint of picture.As a result closer to just explanation picture is more similar.
In the present invention, step S103 specifically includes following sub-step：
Step S1031：The shooting image and original image are carried out respectively pre-set image process, is obtained respectively
Obtain the string of binary characters of corresponding presetting digit capacity；
Step S1032：Compare the difference digit of the string of binary characters of the two image presetting digit capacities, if
When difference digit accounts for the ratio of presetting digit capacity and is more than 1 with the default Similarity value sum, then image phase is judged
Like degree less than default Similarity value, the image display function exception of the display terminal；, whereas if difference
When digit accounts for the ratio of presetting digit capacity and is less than or equal to 1 with the default Similarity value sum, then figure is judged
As similarity is equal to or more than default Similarity value, the image display function exception of the display terminal.
Implement, in order to carry out pre-set image process, step S1031 specifically includes following step
Suddenly：
The first step：It is processed into default for image (shooting image or original image) to be processed, scaling is needed
Size；
Second step：Then gray proces are carried out, the gray value of each pixel in the image is obtained；
3rd step：Obtain the average gray value of whole pixels in the image；
4th step：The gray value of each pixel is compared with the average gray value, is more than or equal to
The average gray value, then be recorded as binary one, and is less than the average gray value, then be recorded as Binary Zero；
5th step：All comparative results are combined, finally obtain the image all pixels point two enter
Character string (i.e. the image string of binary characters of itself) processed.
It should be noted that the effect of the first step is that (shooting image is original for removal need image to be processed
Image) details, only retain the essential informations such as structure, light and shade, abandon the figure that different size, proportional band come
Piece difference.
Implement, for example, for image (shooting image or original image) to be processed is needed, can contract
The size for being processed into 8 × 8 is put, altogether 64 pixels.Then second step is run, by the picture after diminution
Gray proces are carried out, switchs to 64 grades of gray scales, that is to say, that all pixels point only has 64 kinds of colors altogether.
Then the 3rd step is run, the average gray of all 64 pixels is calculated.The 4th step is continued to run with, will be every
The gray scale of individual pixel, is compared with average gray.More than or equal to average gray, 1 is recorded as,
If being less than average gray, 0 is recorded as.5th step, the comparative result of the 4th step above is combined one
Rise, the string of binary characters (being integer) of 64 is just constituted, here it is the fingerprint of this image.
The order of combination is unimportant, as long as ensureing that all images all adopt same order.
It should be noted that after obtaining the fingerprint (string of binary characters) of shooting image and original image,
Shooting image and original image can be just contrasted, looks at how many position is different in 64.In theory,
This equates calculating " Hamming distance " (Hamming distance).If their fingerprint (binary-coded character
String) data bit that differs illustrates that two images are much like less than 5, just；If greater than 10, just explanation
This is two different images.
For the present invention, implement, for a user, in display terminals such as new purchase TVs,
Need to detect whether the picture quality of TV is qualified when user's purchase display terminal such as TV, now can be with
Selection plays one section of video such as film etc., same luck from the local input such as USB end on the display terminals such as TV
The row present invention, opens self-checking function, and automatically the image to playing display on display terminal is detected, i.e.,
Can determine whether whether the image display function of display terminal is abnormal, and playing process participates in detecting without the need for user, waits
User can be just allowed to see testing result after finishing.
Additionally, during user is using display terminals such as TVs, in display terminal processes such as viewing TVs
In, the display terminal such as TV occurs in that abnormal picture, it is difficult to which judgement is input signal source such as Set Top Box, network
Etc. the exception for causing, or the problem of TV itself, now user can connect camera to open TV etc. aobvious
Show the image self-checking function of terminal, it is just problematic when illustrating that signal input is come in if can't detect exception,
User can exclude the display terminals such as the TV problems of itself, check the problem of Set Top Box, network etc..
Therefore, understood based on the technical scheme of the invention described above offer, a kind of display terminal that the present invention is provided
The detection method that image shows, it can be automatically to playing display image on display terminal detects, soon
Speed judges that the image display function of display terminal is whether abnormal, raising accuracy rate, participates in the overall process inspection without the need for user
Survey, a large amount of valuable times of user can be saved, it is ensured that product use feeling of the user to display terminal, give
The work and life of user offers convenience, and is conducive to strengthening the quality of the life of user, with great production reality
Trample meaning.
Referring to the detection method that Fig. 2, a kind of display terminal image provided based on the present invention described in Fig. 1 are shown,
Present invention also offers a kind of display terminal, including：
Image capturing unit 201, for shooting the image that display terminal is showing；
Pretreatment unit 202, is connected with image capturing unit 201, for being obtained to image capturing unit
The shooting image for obtaining carries out pre-optimized process；
Image decoding unit 203, for before display terminal shows, the external video that display terminal is received
Signal is decoded and is obtained the original image of the picture (image that i.e. display terminal is showing)；
Abnormality detecting unit 204, is connected respectively with pretreatment unit 202, image decoding unit 203, uses
Obtain in the shooting image processed through the pretreatment unit 202 is decoded with described image decoding unit 203
The original image for obtaining carries out image similarity comparison, judges whether the image display function of the display terminal is different
Often, when image similarity is less than default Similarity value, judge that the image display function of the display terminal is different
Often, and when image similarity is equal to or more than default Similarity value (explanation similarity is high, much like),
Judge that the image display function of the display terminal is normal, and will determine that result is shown to image-display units；
Image-display units 205, are connected with abnormality detecting unit 204, for receiving the abnormality detection
The whether abnormal judged result of the image display function of the display terminal that unit is sent, and show in real time.
In the present invention, the display terminal can include that display and all-in-one etc. are any with picture
The device of display function.Described image display unit can be the display terminal LCD display or
LED display, or other kinds of display screen.
In the present invention, described image shooting unit 201 is specifically as follows camera, by with display terminal
The camera being connected is then transferred to the pre- place of display terminal shooting the image that display terminal is showing
Reason unit 203.
In the present invention, described image decoding unit 203 can be video signal decoder, implement,
If the display terminal is television set, the external video that can be received display terminal by television decoder
Signal is decoded, and obtains the original image before display terminal shows.
In the present invention, for pretreatment unit 202, the shooting image to being obtained carries out pre-optimized process
Purpose be to remove unrelated information in the shooting image, recover useful information, strengthen the standard that image compares
True property, while maximized simplified data.
It should be noted that for the shooting image obtained captured by camera, can be due to image capture environment
Difference, the such as quality of illumination bright-dark degree and equipment performance often there are noise, the noise meeting
Identification to after is interfered, so needing first to pre-process picture, removes noise.For pre- place
Reason unit 202, the pretreatment operation specifically can include：Remove noise processed.Implement, can
To be removed noise processed by gaussian filtering.
In the present invention, implement, the pretreatment unit 202 can be positioned at the display terminal
Central processor CPU or single-chip microprocessor MCU on mainboard.
For the present invention, it should be noted that the present invention is based on the similarity compared between two width images come real
Existing abnormality detection, if similarity is less than certain default threshold value, that is, thinks that the tested altimetric image is occurred in that
It is abnormal.Similarity has various computational methods.The invention provides a kind of key technology is called " perceive hash algorithm "
(Perceptual hash algorithm), the advantage of this algorithm is simple and quick, is not scaled by picture size
Impact.First one is generated to every pictures " fingerprint " (fingerprint) character string is then more different
The fingerprint of picture.As a result closer to just explanation picture is more similar.
In the present invention, implement, the abnormality detecting unit 204 can be to show eventually positioned at described
Central processing unit DSP or single-chip microprocessor MCU on the mainboard of end.
In the present invention, the abnormality detecting unit 204 specifically includes following subelement：
Pre-set image processes subelement, for the shooting image and original image to be carried out respectively pre-set image
Process, the string of binary characters of corresponding presetting digit capacity is obtained respectively；
Image comparing subunit, for comparing the difference position of the string of binary characters of the two image presetting digit capacities
Number, if difference digit accounts for the ratio of presetting digit capacity when being more than 1 with the default Similarity value sum, sentences
Disconnected image similarity is less than default Similarity value, the image display function exception of the display terminal；Conversely,
If difference digit accounts for the ratio of presetting digit capacity when being less than or equal to 1 with the default Similarity value sum,
Then judge that image similarity is equal to or more than default Similarity value, the image display function of the display terminal
It is abnormal, and will determine that result is shown to image-display units.
In the present invention, the pre-set image processes subelement and image comparing subunit can be in one
Central processor DSP or single-chip microprocessor MCU.
Implement, the pre-set image processes subelement and specifically includes with lower module：
Image scaling module, for for needing image (shooting image or original image) to be processed, at scaling
Manage into default size；
Gradation processing module, is connected with image scaling module, for carrying out at gray scale to the image after scaling
Reason, obtains the gray value of each pixel in the image, and calculates and obtain the flat of whole pixels in the image
Gray value, is then output to gray scale comparing unit；
Gray scale comparison module, is connected with gradation processing module, for by the gray value of each pixel with should
Average gray value is compared, and more than or equal to the average gray value, is then recorded as binary one, and little
In the average gray value, then Binary Zero is recorded as, and each comparative result is exported gives comparative result shape
Into module；
Comparative result forms module, is connected with gray scale comparison module, for send gray scale comparison module
All comparative results are combined, and the string of binary characters for finally obtaining the image all pixels point (i.e. should
The string of binary characters of image itself).
It should be noted that the effect of the image scaling module is to remove to need image (shooting image to be processed
Or original image) details, only retain the essential informations such as structure, light and shade, abandon different size, proportional band
The picture difference come.
Implement, for example, for image (shooting image or original image) to be processed is needed, can contract
The size for being processed into 8 × 8 is put, altogether 64 pixels.Then gradation processing module is run, after diminution
Picture carry out gray proces, switch to 64 grades of gray scales, that is to say, that only 64 kinds altogether of all pixels point
Color, and calculate the average gray of all 64 pixels.Gray scale comparison module is continued to run with, by each
The gray scale of pixel, is compared with average gray.More than or equal to average gray, 1 is recorded as,
If being less than average gray, 0 is recorded as.Then running and comparing result forms module, gray scale will compare above
The comparative result of module, combines, and just constitutes the string of binary characters (being integer) of 64,
Here it is the fingerprint of this image.The order of combination is unimportant, as long as ensureing all images all using same
Order just.
It should be noted that after obtaining the fingerprint (string of binary characters) of shooting image and original image,
Shooting image and original image can be just contrasted, looks at how many position is different in 64.In theory,
This equates calculating " Hamming distance " (Hamming distance).If their fingerprint (binary-coded character
String) data bit that differs illustrates that two images are much like less than 5, just；If greater than 10, just explanation
This is two different images.
For the present invention, implement, for a user, in display terminals such as new purchase TVs,
Need to detect whether the picture quality of TV is qualified when user's purchase display terminal such as TV, now can be with
Selection plays one section of video such as film etc., same luck from the local input such as USB end on the display terminals such as TV
The row present invention, opens self-checking function, and automatically the image to playing display on display terminal is detected, i.e.,
Can determine whether whether the image display function of display terminal is abnormal, and playing process participates in detecting without the need for user, waits
User can be just allowed to see testing result after finishing.
Additionally, during user is using display terminals such as TVs, in display terminal processes such as viewing TVs
In, the display terminal such as TV occurs in that abnormal picture, it is difficult to which judgement is input signal source such as Set Top Box, network
Etc. the exception for causing, or the problem of TV itself, now user can connect camera to open TV etc. aobvious
Show the image self-checking function of terminal, it is just problematic when illustrating that signal input is come in if can't detect exception,
User can exclude the display terminals such as the TV problems of itself, check the problem of Set Top Box, network etc..
In sum, compared with prior art, the invention provides a kind of inspection that shows of display terminal image
Survey method and its display terminal, it can be automatically to playing display image on display terminal detects, soon
Speed judges that the image display function of display terminal is whether abnormal, raising accuracy rate, participates in the overall process inspection without the need for user
Survey, a large amount of valuable times of user can be saved, it is ensured that product use feeling of the user to display terminal, give
The work and life of user offers convenience, and is conducive to strengthening the quality of the life of user, with great production reality
Trample meaning.
The above is only the preferred embodiment of the present invention, it is noted that common for the art
For technical staff, under the premise without departing from the principles of the invention, some improvements and modifications can also be made,
These improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. the detection method that a kind of display terminal image shows, it is characterised in that comprise the following steps：
The first step：Shoot the image that display terminal is showing；
Second step：Shooting image to being obtained carries out pre-optimized process；
3rd step：The original image of treated shooting image and the shooting image is carried out into image similarity
Relatively, judge whether the image display function of the display terminal is abnormal；The original image is to show eventually
Before end shows, decoded by the outer video signal for receiving display terminal and obtained；
4th step：The judged result is shown in real time.
2. the method for claim 1, it is characterised in that in second step, it is described to being obtained
The pre-optimized of shooting image processes operation and is specially：Remove noise processed.
3. the method for claim 1, it is characterised in that in the third step, when image similarity it is low
When default Similarity value, the image display function exception of the display terminal is judged, and work as image similarity
During equal to or more than default Similarity value, judge that the image display function of the display terminal is normal.
4. method as claimed any one in claims 1 to 3, it is characterised in that the 3rd step is concrete
Including following sub-step：
A) shooting image and original image are carried out respectively pre-set image process, obtains corresponding pre- respectively
If the string of binary characters of digit；
B the difference digit of the string of binary characters of the two image presetting digit capacities) is compared, if difference digit is accounted for
When the ratio of presetting digit capacity is more than 1 with the default Similarity value sum, then judge image similarity less than pre-
If Similarity value, the image display function exception of the display terminal；, whereas if difference digit accounts for default
When the ratio of digit is less than or equal to 1 with the default Similarity value sum, then image similarity etc. is judged
In or more than default Similarity value, the image display function exception of the display terminal.
5. method as claimed in claim 4, it is characterised in that step A) comprise the following steps：
Default size is processed into for shooting image to be processed or original image, scaling is needed；
Then gray proces are carried out, the gray value of each pixel in the shooting image or original image is obtained；
Obtain the average gray value of whole pixels in the shooting image or original image；
The gray value of each pixel is compared with the average gray value, more than or equal to the average ash
Angle value, then be recorded as binary one, and is less than the average gray value, then be recorded as Binary Zero；
All comparative results are combined, final shooting image or the original image all pixels point of obtaining
String of binary characters.
6. a kind of display terminal, it is characterised in that include：
Image capturing unit, for shooting the image that display terminal is showing；
Pretreatment unit, is connected with image capturing unit, for the shooting obtained to image capturing unit
Image carries out pre-optimized process；
Image decoding unit, for before display terminal shows, the outer video signal that display terminal is received
Decoded and obtained the original image of the shooting image；
Abnormality detecting unit, is connected respectively with pretreatment unit, image decoding unit, for will be through institute
The shooting image and described image decoding unit for stating pretreatment unit process decodes the original image for obtaining and carries out figure
As similarity-rough set, whether extremely judge the image display function of the display terminal, when image similarity it is low
When default Similarity value, the image display function exception of the display terminal is judged, and work as image similarity
During equal to or more than default Similarity value, judge that the image display function of the display terminal is normal, and will
Judgment result displays are to image-display units；
Image-display units, are connected with abnormality detecting unit, send for receiving the abnormality detecting unit
The display terminal the whether abnormal judged result of image display function, and show in real time.
7. display terminal as claimed in claim 6, it is characterised in that described image shooting unit is shooting
Head, described image decoding unit is video signal decoder.
8. display terminal as claimed in claim 6, it is characterised in that the pretreatment unit is used for figure
As the shooting image that shooting unit is obtained is removed noise processed.
9. the display terminal as any one of claim 6 to 8, it is characterised in that the abnormal inspection
Survey unit and specifically include following subelement：
Pre-set image processes subelement, for the shooting image and original image to be carried out respectively pre-set image
Process, the string of binary characters of corresponding presetting digit capacity is obtained respectively；
Image comparing subunit, for comparing the difference position of the string of binary characters of the two image presetting digit capacities
Number, if difference digit accounts for the ratio of presetting digit capacity when being more than 1 with the default Similarity value sum, sentences
Disconnected image similarity is less than default Similarity value, the image display function exception of the display terminal；Conversely,
If difference digit accounts for the ratio of presetting digit capacity when being less than or equal to 1 with the default Similarity value sum,
Then judge that image similarity is equal to or more than default Similarity value, the image display function of the display terminal
It is abnormal, and will determine that result is shown to image-display units.
10. display terminal as claimed in claim 9, it is characterised in that it is single that the pre-set image processes son
Unit is specifically included with lower module：
Image scaling module, for for need shooting image to be processed or original image, scaling to be processed into pre-
If size；
Gradation processing module, is connected with image scaling module, for the shooting image after scaling or original
Image carries out gray proces, obtains the gray value of each pixel in the image, and calculates the acquisition shooting figure
The average gray value of whole pixels, is then output to gray scale comparing unit in picture or original image；
Gray scale comparison module, is connected with gradation processing module, for by the gray value of each pixel with should
Average gray value is compared, and more than or equal to the average gray value, is then recorded as binary one, and is less than
The average gray value, then be recorded as Binary Zero, and each comparative result is exported form mould to comparative result
Block；
Comparative result forms module, is connected with gray scale comparison module, for send gray scale comparison module
All comparative results are combined, and obtain the default position of all pixels point in the shooting image or original image
Several strings of binary characters.
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