CN101112104A - Video signal emendation method and apparatus - Google Patents
Video signal emendation method and apparatus Download PDFInfo
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- CN101112104A CN101112104A CN 200680003405 CN200680003405A CN101112104A CN 101112104 A CN101112104 A CN 101112104A CN 200680003405 CN200680003405 CN 200680003405 CN 200680003405 A CN200680003405 A CN 200680003405A CN 101112104 A CN101112104 A CN 101112104A
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Abstract
The present invention discloses a method of correcting a video signal that includes a video sequence parameter. The method comprises the steps of: obtaining a specific number of decoded values of the video sequence parameter; counting the times of occurrence of each different value of the decoded values; determining a correction value from the counting result; and correcting the decoded values of the video sequence parameter on the basis of the correction value. The present invention further discloses a correcting apparatus and a decoding apparatus of a video signal. With the present invention, it is able to find out conveniently a correction value of a video sequence parameter so as to correct the subsequent decoded values.
Description
Technical field
The present invention relates to a kind of bearing calibration and device of digital signal, more particularly, relate to a kind of bearing calibration and device of vision signal.
Background technology
In Digital Television (standard definition television and high definition TV) and multimedia application, a plurality of video compression standards have appearred, to satisfy the needs of aspects such as its low bit rate and high-quality.The bit mistake (random error and burst error) of the video flowing behind the coding often causes decode procedure to lose synchronously, thereby can not decode before next one synchronous points again.Therefore it is very important proofreading and correct for decoded vision signal.
In the video bit stream of standard code, Video Sequence Layer comprises initial code.When initial code can be used for causing the encoding and decoding step-out because of error code or other reason, decoder was caught again synchronously.Therefore a step-out will be lost the data as bar at least.Sequence refers to constitute the image sequence of certain road program, has comprised the information such as horizontal size, vertical dimension and frame rate of image in the sequence head behind the sequence initial code.Some additional datas have been comprised in the sequence extension.
Parameter in the sequence head is the basis that the data of all back in the whole sequence are decoded.The sequence head of a damage decoded will obtain wrong horizontal size and vertical dimension, and this will make the visual effect severe exacerbation.In addition, under the DVD situation, frame rate is a fixed value.If this frame rate is mapped as other value, even it is correct to say so on the grammatical meaning of this standard, such mistake also can make visual effect reduce greatly, especially under the situation that its value of specific application need is fixed.
U.S. Patent No. 6,597,741 disclose a kind of video correction apparatus and method, and it utilizes the picture size of an estimation that the sequence head information that mistake occurs is proofreaied and correct.The compressed digital video signals that this video correction device receives comprises a sequence head and at least one coded image.It is decoded and be stored in the memory to be included in encoded video sequence parameter in this sequence head.In the process of coded image being carried out the video decode processing, produce first count of macroblocks of representing the macro block number that comprises in the decoded picture, and suspend decoding processing.Determine second count of macroblocks according to the image size data in the memory then, and compare with first count of macroblocks.After definite first count of macroblocks and second count of macroblocks are equal, use the video sequence parameter of storage to recover the video decode processing at once.Otherwise,, recover this decoding processing then with the video sequence parameter in the adjustment of data memory of the picture size of representing an estimation.
It is the error correction scheme of foundation that European patent No.EP613300 discloses a kind of correct sequence head with the front, is the error correction scheme of foundation and WO0106795 discloses a kind of correct sequence head with subsequently.
Yet all there are some problems in such scheme, promptly is difficult to find out the corrected value of a video sequence parameter sometimes, thereby can not carry out correct correction to decoded vision signal.
Summary of the invention
The bearing calibration and the device that the purpose of this invention is to provide a kind of vision signal, it can easily determine the corrected value of a video sequence parameter, thereby guarantees to be used to proofread and correct the correctness of the corrected value that the subsequent decoding value adopted.
For this reason, the invention provides a kind of bearing calibration of vision signal, this vision signal comprises a video sequence parameter, and the method comprising the steps of: the decode value that obtains the given number of described video sequence parameter; Add up the number of times that each different value in the described decode value occurs; Determine a corrected value according to described statistics; With the decode value of proofreading and correct described video sequence parameter according to this corrected value.
The present invention also provides a kind of means for correcting of vision signal, and described vision signal comprises a decoded video sequence parameter, and described correction module comprises a deriving means, is used to obtain the decode value of the given number of described video sequence parameter; A statistic device is used for adding up the number of times that each different value of described decode value occurs; A definite device is used for determining a corrected value according to described statistics; With a correction module, be used for proofreading and correct the decode value of described video sequence parameter according to this corrected value.
In addition, the present invention also provides a kind of video signal decoding apparatus, and described vision signal comprises a decoded video sequence parameter, and this decoding device comprises a decoder module, is used for described decoding video signal; With a means for correcting.This means for correcting comprises a deriving means, is used to obtain the decode value of the given number of described video sequence parameter; A statistic device is used for adding up the number of times that a value of described decode value occurs; A definite device is used for determining a corrected value according to described statistics; With a correction module, be used for proofreading and correct the decode value of described video sequence parameter according to this corrected value.
Utilize the present invention, can guarantee to be used for the correctness of corrected value of the subsequent decoding value of correcting video sequential parameter, thereby can improve the visual effect of the image of broadcast.
By following description and claim that reference is carried out in conjunction with the accompanying drawings, other purpose of the present invention and advantage will be conspicuous, and the present invention is also had more comprehensively understanding.
Description of drawings
Fig. 1 is the bearing calibration of vision signal according to an embodiment of the invention;
Fig. 2 is the means for correcting of vision signal according to an embodiment of the invention.
In all accompanying drawings, identical reference number is represented similar or identical feature and function.
Embodiment
Describe the preferred embodiments of the present invention with reference to the accompanying drawings in detail.
As everyone knows, no matter how the parameter in the Video Sequence Layer is encoded, in most of the cases, it is constant that the decode value of these parameters all keeps in single Video Applications.In addition, because the importance of sequence head and the needs of application, in a plurality of Video Applications, this sequence head repeats to send.
Like this, can think that some decode values in adjacent video sequence head remain unchanged as horizontal size, vertical dimension and the frame rate etc. of image.So, just can from continuous sequence head, collect the decode value of the some of this parameter, and discern these values.The decode value that occurrence number is maximum in the collected decode value is defined as the corrected value of this parameter.Then with this decode value in the follow-up sequence head of this corrected value correction.
Introduce the bearing calibration of vision signal according to an embodiment of the invention in detail below with reference to Fig. 1, wherein, this vision signal comprises a sequence head and at least one decoded picture, and this sequence head comprises at least one decoded video sequence parameter.The included video sequence parameter of this sequence head comprises horizontal size, vertical dimension and the frame rate etc. of image.
At step S110, obtain the decode value of the given number of described video sequence parameter.
This decoded video sequence parameter can be the horizontal size of image, the vertical dimension or the frame rate of image.The decode value that is received can be in succession, also can be interrupted.The numerical value of the number n of the decode value that is received can determine that promptly wrong bitrate is high more according to the bit error property of transmission, and the value of n is big more.
N decode value of this decoded video sequence parameter in n the sequence head can be stored in the buffer, a window also can be set (for example, a memory space in memory), be used to store n decode value of a decoded video sequence parameter.The length of this window is n.
At step S120, add up the number of times that each different value in the described decode value occurs.
In this step, count the occurrence number of each decode value that repeats in the decode value of this given number.For example, 10 decode values that received are followed successively by: d1, d2, d1, d1, d3, d1, d1, d1, d2, d1.Then decode value d1 occurs 7 times, and decode value d2 occurs 2 times, and decode value d3 occurs 1 time.
Then, at step S130, determine a corrected value, to proofread and correct the decode value of described video sequence parameter according to described statistics.
Can compare the number of times that each decode value occurs, to determine that the decode value that an occurrence number is no less than other decode value occurrence numbers is described corrected value.
Threshold value m less than above-mentioned given number also can be set, as the number p of the decode value that decode value comprised of the given number of this decoded video sequence parameter during more than or equal to threshold value m, determine the corrected value of this decode value for this decoded video sequence parameter, otherwise, processing turns back to step S110, again receive the other one group of decode value in this decoded video sequence parameter, up to the corrected value that finds this decoded video sequence parameter.
The number of the other one group of decode value that is received can equal above-mentioned given number, also can be greater than above-mentioned given number, and threshold value m can remain unchanged.
Equally, threshold value m is big more, and the reliability of corrected value that identifies decoded video sequence parameter is big more.
After the corrected value of determining this decoded video sequence parameter, proofread and correct the decode value (step S140) of this decoded video sequence parameter with this corrected value.
In other words, after the corrected value of determining this decoded video sequence parameter, can check the subsequent decoding value of this decoded video sequence parameter, be different from this corrected value, then replace this subsequent decoding value with this corrected value if find the subsequent decoding value of this decoded video sequence parameter.Then, the decode value after proofreading and correct is sent to a player plays.
Selectively, after determining this corrected value, can decode to this vision signal again, and after proofreading and correct its decode value, send to a player plays with this corrected value.
Among the low-down embodiment of bit error rate in its video flowing according to the present invention, given number can be set to a smaller numerical value, and for example 3, threshold value m can be set to 2.In three sequence heads in succession, if two decode values of a decoded video sequence parameter are identical, just adopting it is that corrected value is checked the corresponding decoding value in the subsequent sequence head.
According to of the present invention another wherein the bit error rate in the video flowing than higher embodiment in, given number can be set to a big relatively numerical value, for example 6.Threshold value m can be set to 4.Like this, in six continuous sequence heads,, just adopt this decode value to check corresponding decoding value in the subsequent sequence head as corrected value if four decode values of a decoded video sequence parameter are identical.
In order to ensure the corrected value that can correctly find a decoded video sequence parameter, given number n can be provided with enough big, for example equal 10, and threshold value m can be set to 8.
Fig. 2 is the means for correcting of vision signal according to an embodiment of the invention.This vision signal comprises a sequence head and at least one decoded picture, and this sequence head comprises at least one decoded video sequence parameter.This decoded video sequence parameter for example is horizontal size, vertical dimension and the frame rate etc. of image.
As shown in Figure 2, this means for correcting comprises a deriving means 210, statistic device 220, a definite device 230 and a correction module 240.
Deriving means 210 obtains the decode value of the given number of described video sequence parameter from a decoder module (not shown), and the decode value that is obtained is sent to statistic device 220.
The number of times that each different value in 220 pairs of described decode values of statistic device occurs is added up.Promptly count the occurrence number of each decode value that repeats in the decode value of this given number.
This decoded video sequence parameter can be the vertical dimension of horizontal size, image of image or frame rate etc.The decode value that is received can be in succession, also can be interrupted.The numerical value of the number n of the decode value that is received can determine that promptly wrong bitrate is high more according to the bit error property of transmission, and the value of n is big more.
Determine that device 230 determines a corrected value according to statistics.
Determine that device 230 can comprise a comparison means 235, be used for each described decode value occurrence number of comparison, to determine that the decode value that an occurrence number is no less than other described decode value occurrence numbers is described corrected value.
Can in comparison means 235, set in advance a threshold value m less than above-mentioned given number, as the number p of the decode value that decode value comprised of the given number of this decoded video sequence parameter during, determine the corrected value of this decode value for this decoded video sequence parameter more than or equal to threshold value m.
Otherwise, if without any the number of a decode value more than or equal to threshold value m, then determine device 230 notice deriving means 210, make deriving means 210 receive other one group of decode value in this decoded video sequence parameter again, up to the corrected value of determining this decoded video sequence parameter.
The number of the other one group of decode value that is received can equal above-mentioned given number, also can be greater than above-mentioned given number, and threshold value m can remain unchanged.
The numerical value of parameter n and threshold value m can determine that promptly wrong bitrate is high more according to the bit error property of transmission, and the value of n and m is big more.And the numerical value of parameter n and threshold value m is big more, and the reliability of corrected value that identifies decoded video sequence parameter is big more.
After the corrected value of determining this decoded video sequence parameter, determine device 230 notice deriving means 210, make deriving means 210 no longer from the decoder module received signal, and determined corrected value is sent to correction module 240.
After receiving this corrected value, follow-up decode value and this corrected value of this video sequence parameter that correction module 240 will receive from decoder module compare.If the subsequent decoding value that correction module 240 is received is different from this corrected value, then this decode value is reverted to this corrected value, and then send it to the playing device (not shown).And if the decode value of this video sequence parameter that correction module 240 is received is identical with this corrected value, then this decoding numerical value is not handled.
Before determining that device 230 is determined the corrected value of these decoded video sequence parameter, correction module 240 can directly send to playing device with the decode value of this video sequence parameter of being received.
Certainly, after determining that device 230 is determined the corrected value of this decoded video sequence parameter, also can decode to this vision signal again, and after with its decode value of this correction, send to a player plays.
In addition, according to another embodiment of the invention, also provide a kind of video signal decoding apparatus, this decoding device comprises a decoder module, is used for described decoding video signal; With a means for correcting as shown in Figure 2.For simplicity, no longer this means for correcting is given unnecessary details.
The present invention can be applied to mpeg video decoder etc., for example the DVD/VCD player.
Digital video signal is decoded as example the present invention is introduced above.It will be understood by those skilled in the art that the foregoing description is illustrative, is not construed as limiting the invention.The present invention can be applied to during the decoding, decompression of other digital signal etc. handle, as long as its video sequence parameter that comprises is a steady state value.
Although described the present invention, be to be understood that this openly can not being interpreted as limits according to present preferred embodiment.After disclosing more than having read, various for those skilled in the art changes and modification will become apparent undoubtedly.Therefore, plan claims are interpreted as covering all changes and the modification that falls within true spirit of the present invention and the scope.
Claims (17)
1. the bearing calibration of a vision signal, this vision signal comprise a video sequence parameter, and the method comprising the steps of:
(a) obtain the decode value of the given number of described video sequence parameter;
(b) number of times of each different value appearance in the described decode value of statistics;
(c) determine a corrected value according to described statistics; With
(d) proofread and correct the decode value of described video sequence parameter according to this corrected value.
2. the method for claim 1, wherein described video sequence parameter comprises following a kind of parameter at least: the horizontal size of video image, the vertical dimension of video image and the frame rate of vision signal.
3. the method for claim 1, wherein described given number is determined according to described video information error of transmission characteristic.
4. the method for claim 1, wherein step (c) further comprises:
(c1) compare the number of times that each described decode value occurs, to determine that the decode value that an occurrence number is no less than other described decode value occurrence numbers is described corrected value.
5. the method for claim 1, wherein step (c) further comprises:
(c2) if the occurrence number of a described decode value, determines then that this decode value is described corrected value greater than a threshold value that presets.
6. method as claimed in claim 5, wherein, described threshold value is determined according to described transmission of video signals error property.
7. the method for claim 1, wherein in step (a), the decode value of described given number is a decode value in succession.
8. the means for correcting of a vision signal, described vision signal comprises a decoded video sequence parameter, described means for correcting comprises:
A deriving means is used to obtain the decode value of the given number of described video sequence parameter;
A statistic device is used for adding up the number of times that each different value of described decode value occurs;
A definite device is used for determining a corrected value according to described statistics; With
A correction module is used for proofreading and correct according to this corrected value the decode value of described video sequence parameter.
9. device as claimed in claim 8, wherein, described video sequence parameter comprises following a kind of parameter at least: the horizontal size of video image, the vertical dimension of video image and the frame rate of vision signal.
10. device as claimed in claim 8, wherein, described given number is determined according to described video information error of transmission characteristic.
11. device as claimed in claim 8, wherein, described definite device further comprises:
A comparison means is used for each described decode value occurrence number of comparison, to determine that the decode value that an occurrence number is no less than other described decode value occurrence numbers is described corrected value.
12. device as claimed in claim 8, wherein, described definite device further comprises:
A comparison means is if the occurrence number that is used for a described decode value, determines then that this decode value is described corrected value greater than a threshold value that presets.
13. device as claimed in claim 12, wherein, described threshold value is determined according to described transmission of video signals error property.
14. a video signal decoding apparatus, described vision signal comprise a decoded video sequence parameter, this decoding device comprises:
A decoder module is used for described decoding video signal; With
A correction module, this correction module comprises:
A deriving means is used to obtain the decode value of the given number of described video sequence parameter;
A statistic device is used for adding up the number of times that a value of described decode value occurs;
A definite device is used for determining a corrected value according to described statistics; With
A correction module is used for proofreading and correct according to this corrected value the decode value of described video sequence parameter.
15. device as claimed in claim 14, wherein, described video sequence parameter comprises following a kind of parameter at least: the horizontal size of video image, the vertical dimension of video image and the frame rate of vision signal.
16. device as claimed in claim 14, wherein, described definite device further comprises:
A comparison means is used for the statistics according to described statistic device, compares the occurrence number of each described decode value, to determine that the decode value that an occurrence number is no less than other described decode value occurrence numbers is described corrected value.
17. device as claimed in claim 14, wherein, described definite device further comprises:
A comparison means is if the occurrence number that is used for a described decode value, determines then that this decode value is described corrected value greater than a threshold value that presets.
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| CN 200680003405 CN101112104A (en) | 2005-01-28 | 2006-01-18 | Video signal emendation method and apparatus |
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| CN200510005109.5 | 2005-01-28 | ||
| CN 200680003405 CN101112104A (en) | 2005-01-28 | 2006-01-18 | Video signal emendation method and apparatus |
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