CN101888562B - Method for improving image quality of video decoding and decoder - Google Patents
Method for improving image quality of video decoding and decoder Download PDFInfo
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- CN101888562B CN101888562B CN201010222763.2A CN201010222763A CN101888562B CN 101888562 B CN101888562 B CN 101888562B CN 201010222763 A CN201010222763 A CN 201010222763A CN 101888562 B CN101888562 B CN 101888562B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
- H04N19/174—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a slice, e.g. a line of blocks or a group of blocks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
- H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
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- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/85—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression
- H04N19/89—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression involving methods or arrangements for detection of transmission errors at the decoder
- H04N19/895—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression involving methods or arrangements for detection of transmission errors at the decoder in combination with error concealment
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Abstract
The invention discloses a method for improving image quality of video decoding and a decoder. The method comprises: when abnormal condition of a code stream is detected in a video image compression data stream decoding process, determining an abnormal macro block which takes data packet as a unit; and performing concealing treatment of the abnormal macro block. In the invention, when the abnormal condition of a code stream is detected in the decoding process, the determined abnormal macro block takes data packet as a unit, so color blocks or misaligned and isolated blocks and other phenomena caused by code loss and error in the video image decoding process are eliminated effectively. Particularly, when the quality of the code stream is low, the adverse influences of abnormal macro blocks at connected or near positions on the decoding process of adjacent normal macro blocks and the adverse influences of the abnormal macro blocks on the decoding process of subsequent normal macro blocks are avoided, the overall viewing effect of the decoded video is improved, and user experience is improved.
Description
Technical field
The invention belongs to video communication field, be specifically related to a kind of method and decoder that improves image quality of video decoding.
Background technology
In wireless video communication, multipath fading phenomenon or external interference signals easily make wireless signal unstable, and transmission quality declines, and make to exist in video code flow the phenomenon of packet loss and error code.H.264 and MPEG-4 (Moving Picture Experts Group) video encoding standard in the H.324-M standard that at present 3G (Third Generation) Moblie (3rd Generation is called for short 3G) technical standard is used, stipulated to use H.263.These several standards are all the video coding algorithms based on motion compensation, and most of frame of video wherein and the correlation of previous frame are very high, and the mistake of any frame all can be propagated, be diffused in follow-up some frames, thereby cause the serious reduction of video quality.
Code stream packet loss has directly caused the loss of decoded information, makes decoding occur mistake, and code stream error code can cause the mistake of decoded information, can affect decoded video quality equally.In addition, when code stream packet loss, if decoder does not have to find in time the generation of packet loss, and mistake is decoded follow-up stream packet as current code stream, there will be and the similar consequence of code stream error code, main phenomenon there will be serious color lump, the isolated piece of dislocation etc. while being exactly decoding.
In general code stream error code has the multiple different form of expression, for example head mistake, motion vector mistake and quantization parameter mistake.The wrong data below that can cause of head all can not normal decoder (comprising motion vector and quantization parameter).Motion vector mistake can cause motion compensation malposition, produces isolated piece.Quantization parameter mistake can cause the brightness of decoding or chromatic value incorrect.
The frequent position of abnormal macro block that in actual decode procedure, abnormal code stream is corresponding be connected or position close, the close abnormal macro block in position can affect the decode procedure of the normal macro block being adjacent, and abnormal macro block also may cause its follow-up normal macro block decoding error.In addition, while judging abnormal macro block in prior art in decode procedure, generally there is hysteresis quality, as shown in Figure 1, macro block MB in code stream
nerroneous macroblock, but this macro block MB
ndo not meet the judge condition that decoder judges abnormal macro block, may cause decoder being decoded to macro block MB
n+mtime just find mistake, thereby make MB
nto MB
n+m-1between macro block decoding after, there is the phenomenon of color lump or the isolated piece of dislocation in image.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method and decoder that improves image quality of video decoding, effectively eliminates the phenomenon of color lump in the decoded picture causing because of packet loss or error code or the isolated piece of dislocation, improves the quality of decoded picture.
In order to solve the problems of the technologies described above, the invention provides a kind of method that improves image quality of video decoding, comprise: in the process that video image compression data flow is decoded, the abnormal macro block that the abnormal rear definite abnormal macro block of code stream detected and determine be take packet as unit, and abnormal macro block is carried out to hidden processing.
Further, said method can also have following characteristics:
While event of data loss being detected during decoding, by all macro blocks in the packet at last macro block place that obtains complete decoding being detected in this decode procedure before constantly of loss of data, be defined as abnormal macro block.
Further, said method can also have following characteristics:
While syntax error being detected for code stream in decode procedure, will occur that in the packet at macro block place of syntax error, all macro blocks are defined as abnormal macro block.
Further, said method can also have following characteristics:
Detect syntax error refer to detect a kind of or several in following situation in: in macro block, motion vector exceeds effective range, avriable length codes is invalid, the value of discrete cosine transform coefficient exceeds effective range, and discrete cosine transform coefficient number exceeds that effective range, quantization parameter exceed effective range, the macroblock number that decodes exceeds effective range.
Further, said method can also have following characteristics:
Described packet refers to the frame image data stipulated in video compression standard or macro block group or a video packets or a band.
In order to solve the problems of the technologies described above, the present invention also provides a kind of decoder that improves image quality of video decoding, and described decoder comprises code stream abnormality juding module and hidden processing module; Described code stream abnormality juding module, for the process of video image compression data flow being decoded at decoder, detect that code stream is abnormal determines that abnormal macro block and the abnormal macro block of determining take packet as unit afterwards, and by the position informing of abnormal macro block to described hidden processing module; Described hidden processing module, for carrying out hidden processing to the data of the abnormal macro block position of knowing from described code stream abnormality juding module.
Further, above-mentioned decoder can also have following characteristics:
Described code stream abnormality juding module, also when event of data loss being detected when described decoder is decoded, by all macro blocks in the packet at last macro block place that obtains complete decoding being detected in this decode procedure before constantly of loss of data, be defined as abnormal macro block.
Further, above-mentioned decoder can also have following characteristics:
Described code stream abnormality juding module, also for carrying out decode procedure at described decoder while syntax error being detected for code stream, will occur that in the packet at macro block place of syntax error, all macro blocks are defined as abnormal macro block.
Further, above-mentioned decoder can also have following characteristics:
Described code stream abnormality juding module detect syntax error refer to detect a kind of or several in following situation in: in macro block, motion vector exceeds effective range, avriable length codes is invalid, the value of discrete cosine transform coefficient exceeds effective range, and discrete cosine transform coefficient number exceeds that effective range, quantization parameter exceed effective range, the macroblock number that decodes exceeds effective range.
Further, above-mentioned decoder can also have following characteristics:
Described packet refers to the frame image data stipulated in video compression standard or macro block group or a video packets or a band.
Code stream in decode procedure of the present invention, detected when abnormal, the abnormal macro block of determining be take packet as unit, thereby effectively eliminates the phenomenons such as the color lump that occurs in the video image decoding causing because of packet loss or error code or the isolated piece of dislocation.Especially in the situation that code stream is second-rate, effectively suppressed the abnormal macro block that position is connected or position is close harmful effect to the decode procedure of follow-up normal macro block to the harmful effect of the decode procedure of adjacent normal macro block and abnormal macro block, improve the whole viewing effect of decoded video, improve user and experience.
Accompanying drawing explanation
While judging abnormal macro block in prior art, there is the schematic diagram of hysteresis situation in Fig. 1;
Fig. 2 is the composition structure chart that improves the decoder of image quality of video decoding in embodiment;
Fig. 3 is the method flow diagram that improves image quality of video decoding in embodiment;
Fig. 4 is the decoding example accompanying drawing of exemplary embodiment one in embodiment;
Fig. 5 is the decoding example accompanying drawing of exemplary embodiment two in embodiment.
Embodiment
As shown in Figure 2, the decoder of raising image quality of video decoding comprises code stream abnormality juding module and hidden processing module.
The process of code stream abnormality juding module for video image compression data flow being decoded at decoder, detect that code stream is abnormal determines that abnormal macro block and the abnormal macro block of determining take packet as unit afterwards, and by the position informing of abnormal macro block to described hidden processing module.
Hidden processing module is for carrying out hidden processing to the data of the abnormal macro block position of knowing from described code stream abnormality juding module.
This decoder can exemplary process deal with data loss situation, code stream abnormality juding module when event of data loss being detected when described decoder is decoded, is defined as abnormal macro block by all macro blocks in the packet at last macro block place that obtains complete decoding being detected in this decode procedure before constantly of loss of data.
Also can exemplary process code stream there is the situation of syntax error in this decoder, code stream abnormality juding module is for carrying out decode procedure while syntax error being detected for code stream at described decoder, will occur that in the packet at macro block place of syntax error, all macro blocks are defined as abnormal macro block.
Code stream abnormality juding module detect syntax error refer to detect a kind of or several in following situation in: in macro block, motion vector exceeds effective range, avriable length codes (Variable Length Code, be called for short VLC) invalid, discrete cosine transform (Discrete Cosine Transform, being called for short DCT) value of coefficient exceeds effective range, and discrete cosine transform coefficient number exceeds that effective range, quantization parameter exceed effective range, the macroblock number that decodes exceeds effective range.
In the present invention, the packet of indication refers to the frame image data stipulated in video compression standard or macro block group or a video packets or a band.Wherein, macro block group typical case refers to macro block group (the Groups of Blocks stipulating in standard H.263, be called for short GOB), video packets typical case refers to video packets (the Video Packet stipulating in MPEG-4 standard, be called for short VP), H.264 band typical case refers to regulation band (Slice) in standard.
As shown in Figure 3, the method that improves image quality of video decoding comprises: in the process that video image compression data flow is decoded, the abnormal macro block that the abnormal rear definite abnormal macro block of code stream detected and determine be take packet as unit, and abnormal macro block is carried out to hidden processing.
The applicable situation one of typical case: while event of data loss being detected during decoding, be defined as abnormal macro block by all macro blocks in the packet at last macro block place that obtains complete decoding being detected in this decode procedure before constantly of loss of data.
As shown in Figure 4, S macro block to the macro block between M macro block belongs to same packet X, decoder decoding E macro block also carries out not finding syntax error after complete decoding to E macro block, what while continuing decoding, decode is N macro block, decoder judges that E macro block is to the macro block loss between M macro block, in order to prevent that the data that code stream mistake causes E macro block macro block before to decode from occurring that thereby mistake causes the situations such as color lump or macro block dislocation, by the packet at E macro block place, be that in packet X, all macro blocks are defined as abnormal macro block.
The applicable situation two of typical case: while syntax error being detected for code stream in decode procedure, will occur that in the packet at macro block place of syntax error, all macro blocks are defined as abnormal macro block.Detect syntax error refer to detect a kind of or several in following situation in: in macro block, motion vector exceeds effective range, avriable length codes is invalid, the value of discrete cosine transform coefficient exceeds effective range, and discrete cosine transform coefficient number exceeds that effective range, quantization parameter exceed effective range, the macroblock number that decodes exceeds effective range.
As shown in Figure 5, A macro block to the macro block between E macro block belongs to same packet Y, decoder detects syntax error while being decoded to D macro block, now the data that decode corresponding to macro block before D macro block may be wrong, but error code mode does not belong to the error code mode in grammer detection algorithm in decoder, so be that in packet Y, all macro blocks are defined as abnormal macro block by the packet at D macro block place.
The hidden processing of in the present invention, abnormal macro block being carried out is prior art, the mode of carrying out hidden processing has multiple, for example abnormal macro block is replaced with to fixed fixedly macro block, to abnormal macro block carry out pixel value Fuzzy Processing, pixel value in abnormal macro block is carried out to equilibrium treatment etc.
In the present invention, the packet of indication refers to the frame image data stipulated in video compression standard or macro block group or a video packets or a band.Wherein, macro block group typical case refers to macro block group (the Groups of Blocks stipulating in standard H.263, be called for short GOB), video packets typical case refers to video packets (the Video Packet stipulating in MPEG-4 standard, be called for short VP), band typical case refers to the band (Slice) of stipulating in standard H.264.
Code stream in decode procedure of the present invention, detected when abnormal, the abnormal macro block of determining be take packet as unit, thereby effectively eliminates the phenomenons such as the color lump that occurs in the video image decoding causing because of packet loss or error code or the isolated piece of dislocation.Especially in the situation that code stream is second-rate, effectively suppressed the abnormal macro block that position is connected or position is close harmful effect to the decode procedure of follow-up normal macro block to the harmful effect of the decode procedure of adjacent normal macro block and abnormal macro block, improve the whole viewing effect of decoded video, improve user and experience.
Certainly; the present invention also can have other various embodiments; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
One of ordinary skill in the art will appreciate that all or part of step in said method can come instruction related hardware to complete by program, described program can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can realize with one or more integrated circuits.Correspondingly, each the module/unit in above-described embodiment can adopt the form of hardware to realize, and also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Claims (8)
1. a method that improves image quality of video decoding, is characterized in that,
In the process that video image compression data flow is decoded, detect that code stream is abnormal determines that abnormal macro block and the abnormal macro block of determining take packet as unit afterwards, and abnormal macro block is carried out to hidden processing;
While event of data loss being detected during decoding, by all macro blocks in the packet at last macro block place that obtains complete decoding being detected in this decode procedure before constantly of loss of data, be defined as abnormal macro block.
2. the method for claim 1, is characterized in that,
While syntax error being detected for code stream in decode procedure, will occur that in the packet at macro block place of syntax error, all macro blocks are defined as abnormal macro block.
3. method as claimed in claim 2, is characterized in that,
Detect syntax error refer to detect a kind of or several in following situation in: in macro block, motion vector exceeds effective range, avriable length codes is invalid, the value of discrete cosine transform coefficient exceeds effective range, and discrete cosine transform coefficient number exceeds that effective range, quantization parameter exceed effective range, the macroblock number that decodes exceeds effective range.
4. the method as described in arbitrary claim in claims 1 to 3, is characterized in that,
Described packet refers to the frame image data stipulated in video compression standard or macro block group or a video packets or a band.
5. a decoder that improves image quality of video decoding, is characterized in that,
Described decoder comprises code stream abnormality juding module and hidden processing module;
Described code stream abnormality juding module, for the process of video image compression data flow being decoded at decoder, detect that code stream is abnormal determines that abnormal macro block and the abnormal macro block of determining take packet as unit afterwards, and by the position informing of abnormal macro block to described hidden processing module; Determine that abnormal macro block comprises: while event of data loss being detected when described decoder is decoded, by all macro blocks in the packet at last macro block place that obtains complete decoding being detected in this decode procedure before constantly of loss of data, be defined as abnormal macro block;
Described hidden processing module, for carrying out hidden processing to the data of the abnormal macro block position of knowing from described code stream abnormality juding module.
6. decoder as claimed in claim 5, is characterized in that,
Described code stream abnormality juding module, also for carrying out decode procedure at described decoder while syntax error being detected for code stream, will occur that in the packet at macro block place of syntax error, all macro blocks are defined as abnormal macro block.
7. decoder as claimed in claim 6, is characterized in that,
Described code stream abnormality juding module detect syntax error refer to detect a kind of or several in following situation in: in macro block, motion vector exceeds effective range, avriable length codes is invalid, the value of discrete cosine transform coefficient exceeds effective range, and discrete cosine transform coefficient number exceeds that effective range, quantization parameter exceed effective range, the macroblock number that decodes exceeds effective range.
8. the decoder as described in arbitrary claim in claim 5 to 7, is characterized in that,
Described packet refers to the frame image data stipulated in video compression standard or macro block group or a video packets or a band.
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| CN201010222763.2A CN101888562B (en) | 2010-06-30 | 2010-06-30 | Method for improving image quality of video decoding and decoder |
| PCT/CN2011/075582 WO2012000379A1 (en) | 2010-06-30 | 2011-06-10 | Method and decoder for improving quality of video decoding image |
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| CN101888562B (en) * | 2010-06-30 | 2014-03-19 | 中兴通讯股份有限公司 | Method for improving image quality of video decoding and decoder |
| CN104202611A (en) * | 2014-09-01 | 2014-12-10 | 赛特斯信息科技股份有限公司 | Method of realizing detection on broken screen defect in video file based on video decoder |
| CN109040761A (en) * | 2018-09-17 | 2018-12-18 | 俞群爱 | A kind of monitoring on-wall system with encrypted watermark |
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