CN101640792B - Method, equipment and system for compression coding and decoding of cartoon video - Google Patents
Method, equipment and system for compression coding and decoding of cartoon video Download PDFInfo
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Abstract
The invention discloses a compression coding method for cartoon video. The method comprises the following steps: extracting an edge of an original image of the cartoon video, determining the extracted edge as an edge frame, and subtracting the edge frame from the original image of the cartoon video to acquire a residual frame; and superposing coding code stream of the edge frame generated when a dot matrix of the edge frame is converted into a vector format and coding code stream of the residual frame generated when the residual frame is coded, and outputting the coding code stream of the cartoon video. Meanwhile, the invention discloses a compression decoding method for the cartoon video, a cartoon video compression coder, a decoder and a coding and decoding system. The invention can improve the compression coding efficiency of the whole video, and reduce the requirement for network bandwidth.
Description
Technical field
The present invention relates to the video technique field, relate in particular to compression coding and decoding method, equipment and the system of cartoon video.
Background technology
Along with the continuous increase of wireless network bandwidth, video traffic has become the important development direction of data service.Except true man's original video, individualized videos such as cartoon more and more cause people's attention with its lively, vivid art up characteristics.Cartooning's video can be generated by dual mode: artificial drafting and converted from original video.Artificial drafting can be created cartoon character by means of professional tool, and is generally comparatively lively, and can carry out the part exaggeration and handle.And be to generate corresponding cartoon video automatically from original video from original video transition card general rule, its typical treatment process as shown in Figure 1, at first carrying out Salience (signal portion) behind the input original video extracts, again through rim detection, expansion/burn into Bilateral Filter (two-sided filter)/Mean Shift (average drifting), reprocessing, quantification, output card Tonghua video.As a rule, compare with the cartoon of artificial drafting, the cartoon that generates from original video includes more detailed information.
The processing mode of in the prior art cartoon video being carried out compressed encoding is the same with true man's original video, directly carries out compressed encoding, for example with H.264, H.263, conventional video compression standards such as MPEG2, MPEG4 etc. carry out compressed encoding.But the inventor the analysis found that a large amount of high fdrequency components that strong edge is brought are not suitable for carrying out video compression coding, will cause the cartoon video compression coding efficiency low excessively because the artistic characteristic of cartoon image has determined it to have a large amount of strong edges.
Summary of the invention
The embodiment of the invention provides a kind of compaction coding method of cartoon video, and in order to improve the compression coding efficiency of cartoon video, this method comprises:
Original image to cartoon video carries out edge extracting, and the edge that extracts is defined as edge frame, and original image and the edge frame of cartoon video subtracted each other the acquisition residual frame; To be converted to the encoding code stream of the edge frame that vector format generates, the encoding code stream stack of the residual frame that generates by residual frame is encoded, the encoding code stream of output cartoon video from dot matrix format by edge frame.
The embodiment of the invention also provides a kind of comprssing coding/decoding method of cartoon video, and in order to improve the compression coding efficient of cartoon video, this method comprises:
Receive the encoding code stream of cartoon video, from described encoding code stream, isolate the encoding code stream of edge frame and the encoding code stream of residual frame; Wherein, described edge frame is: the original image to cartoon video carries out edge extracting, the determined frame in the edge of extraction; Described residual frame is: the original image and the edge frame of cartoon video are subtracted each other the frame that is obtained; To be converted to edge frame that dot matrix format generates, superpose the original image of output cartoon video by the residual frame that generates that the encoding code stream of residual frame is decoded frame by frame from vector format by the encoding code stream of edge frame.
The embodiment of the invention also provides a kind of cartoon video condensing encoder, and in order to improve the compression coding efficiency of cartoon video, this encoder comprises:
The edge extracting module is used for the original image of cartoon video is carried out edge extracting, and the edge that extracts is defined as edge frame, and original image and the edge frame of cartoon video subtracted each other the acquisition residual frame;
The edge frame coding module is used for edge frame is converted to vector format from dot matrix format, generates the encoding code stream of edge frame;
The residual frame coding module is used for residual frame is encoded, and generates the encoding code stream of residual frame;
Output processing module is used for the encoding code stream of edge frame and the encoding code stream stack of residual frame, the encoding code stream of output cartoon video.
The embodiment of the invention also provides a kind of cartoon video compression decoder, and in order to improve the compression coding efficient of cartoon video, this decoder comprises:
Receiver module is used to receive the encoding code stream of cartoon video; Separation module is used for isolating the encoding code stream of edge frame and the encoding code stream of residual frame from described encoding code stream; Wherein, described edge frame is: the original image to cartoon video carries out edge extracting, the determined frame in the edge of extraction; Described residual frame is: the original image and the edge frame of cartoon video are subtracted each other the frame that is obtained; The edge frame decoder module is used for the encoding code stream of edge frame is converted to dot matrix format from vector format, generates edge frame; The residual frame decoder module is used for the encoding code stream of residual frame is decoded, and generates residual frame; Output processing module is used for edge frame and residual frame are superposeed frame by frame, the original image of output cartoon video.
The embodiment of the invention also provides a kind of cartoon video compression coding and decoding system, and in order to improve the compression coding and decoding efficient of cartoon video, this system comprises:
Encoder is used for the original image of cartoon video is carried out edge extracting, and the edge that extracts is defined as edge frame, and original image and the edge frame of cartoon video subtracted each other the acquisition residual frame; To be converted to the encoding code stream of the edge frame that vector format generates, the encoding code stream stack of the residual frame that generates by residual frame is encoded, the encoding code stream of output cartoon video from dot matrix format by edge frame;
Decoder is used to receive the encoding code stream of cartoon video, isolates the encoding code stream of edge frame and the encoding code stream of residual frame from described encoding code stream; To be converted to edge frame that dot matrix format generates, superpose the original image of output cartoon video by the residual frame that generates that the encoding code stream of residual frame is decoded frame by frame from vector format by the encoding code stream of edge frame.
There are the characteristics at strong edge in the embodiment of the invention at cartoon video, when coding, the original image of cartoon video is carried out edge extracting, and the edge that extracts is defined as edge frame, and original image and the edge frame of cartoon video subtracted each other the acquisition residual frame; To be converted to the encoding code stream of the edge frame that vector format generates, the encoding code stream stack of the residual frame that generates by residual frame is encoded, the encoding code stream of output cartoon video from dot matrix format by edge frame; When decoding, from the encoding code stream of cartoon video, isolate the encoding code stream of edge frame and the encoding code stream of residual frame; Will by the encoding code stream of edge frame from vector format be converted to edge frame that dot matrix format generates, the residual frame that generates superposes frame by frame by the encoding code stream of residual frame is decoded, the original image of output cartoon video, thereby handle by cartoon video being carried out edge extracting, marginal information in the cartoon video and non-marginal information are carried out encoding and decoding respectively, improve the compression coding and decoding efficient of whole video, reduce requirement the network bandwidth.
Description of drawings
Fig. 1 is converted to the schematic diagram of cartoon video for original video in the background technology;
Fig. 2 is the compressed encoding process chart of cartoon video in the embodiment of the invention;
Fig. 3 is the schematic diagram of an instantiation of the compressed encoding of cartoon video in the embodiment of the invention;
Fig. 4 is the compression coding process chart of cartoon video in the embodiment of the invention;
Fig. 5 is the schematic diagram of an instantiation of the compression coding of cartoon video in the embodiment of the invention;
Fig. 6 is the structural representation of cartoon video condensing encoder in the embodiment of the invention;
Fig. 7 is the structural representation of cartoon video compression decoder in the embodiment of the invention;
Fig. 8 is the structural representation of cartoon video compression coding and decoding system in the embodiment of the invention.
Embodiment
As previously mentioned, prior art can not be carried out compressed encoding to cartoon video effectively, the cartoon video that particularly comprises strong edge, scene complexity, the more details of reservation, and have only individualized videos such as cartoon have been carried out effective compressed encoding, reduce its encoder bit rate as far as possible, just can make it be applicable to application such as cartoon video communication.
The inventor considers, is that the bitmap images of the pixel value of every bit on the image is different with storage cell, can utilize polar plot to use straight line and curve to describe figure.The element of these figures is some points, line, rectangle, polygon, circle and camber line etc., because they all can calculate by mathematical formulae and obtain, therefore the vector graphics file volume is generally less, and then the strong edge of cartoon video can be carried out vectorized process, represent effectively and store marginal information, to improve code efficiency.
As shown in Figure 2, in the embodiment of the invention, the compressed encoding handling process of cartoon video is as follows:
During enforcement, edge extraction algorithms such as available Canny operator are handled each frame of input cartoon video, extract strong edge.Can be directly the edge that extracts be defined as edge frame, original image and the edge frame of cartoon video subtracted each other the acquisition residual frame.
When residual frame was encoded, coded system can have multiple, did not all influence enforcement of the present invention.The inventor considers herein, and vectorized process is suitable for handling a small amount of scene, the fairly simple cartoon image of lines.If the cartoon video scene is complicated or kept more details, vectorized process then needs to represent various profiles than multi-line section, the expression of color also needs more expense in addition, thereby, preferably residual frame is still encoded with compress mode in embodiments of the present invention in order further to improve the code efficiency of whole cartoon video.
Then, it is converted to vector format from dot matrix format, generates the encoding code stream of edge frame for edge frame; For residual frame, carry out compressed encoding, for example H.264, H.263, video compression coding modes such as MPEG2, MPEG4.
Among the embodiment, consider that and continuous carrier chrominance signal is more suitable for H.264 waiting conventional video standards to compress in adopting compressed encoding as adopting, and the chromatic component at edge can be given over to and carry out compressed encoding because chromatic component changes slowlyer.Thereby the brightness of edge part separated with chromatic component, brightness partly is superimposed on the blank frame, form the frame that comprises original image edge brightness component, be defined as edge frame.Primitive frame and edge frame are subtracted each other, promptly obtain comprising the frame of the full detail except that the edge monochrome information, be residual frame.
Lift the compaction coding method of cartoon video in the example explanation embodiment of the invention below.
As shown in Figure 3, in this example, for edge frame, advanced row vector processing is converted to vector image by dot matrix image, to reduce its image size.Can adopt any one lossless compression algorithms such as Winzip, Winrar that vector image is compressed, with its encoder bit rate of further reduction.For residual frame, adopt H.264 standard to encode.Because of it does not have the high-frequency information that strong edge brings, thereby be suitable for adopting H.264 so traditional encryption algorithm to compress.Subsequently, the encoding code stream of edge frame and residual frame is superposeed, just obtained the compressed bit stream of output.The flag bit of the encoding code stream of the encoding code stream of distinguishing edge frame and residual frame can be set, as the foundation of decoding in the encoding code stream frame head of cartoon video.
As shown in Figure 4, in the embodiment of the invention, cartoon video compression coding handling process is as follows:
The encoding code stream of step 401, reception cartoon video is isolated the encoding code stream of edge frame and the encoding code stream of residual frame from described encoding code stream;
Lift the comprssing coding/decoding method of cartoon video in the example explanation embodiment of the invention below.
As shown in Figure 5, in this example, code stream is split piecemeal, decodes respectively in decoding end.In the enforcement, the flag bit of the encoding code stream of the differentiation edge frame that is provided with in can the encoding code stream frame head according to cartoon video and the encoding code stream of residual frame is isolated earlier the encoding code stream of edge frame and the encoding code stream of residual frame from described encoding code stream.In the enforcement, before the encoding code stream with edge frame is converted to dot matrix format from vector format, can carry out the lossless compress decoding, generate edge frame.
Based on same inventive concept, the embodiment of the invention also provides a kind of cartoon video condensing encoder, and its structure can comprise as shown in Figure 6:
Edge frame coding module 602 is used for edge frame is converted to vector format from dot matrix format, generates the encoding code stream of edge frame;
Residual frame coding module 603 is used for residual frame is encoded, and generates the encoding code stream of residual frame;
Among the embodiment, edge frame coding module 602 can also be used for edge frame after dot matrix format is converted to vector format, carry out lossless compression-encoding, generate the encoding code stream of edge frame.
Based on same inventive concept, the embodiment of the invention also provides a kind of cartoon video compression decoder, and its structure can comprise as shown in Figure 7:
Receiver module 701 is used to receive the encoding code stream of cartoon video;
Separation module 702 is used for isolating the encoding code stream of edge frame and the encoding code stream of residual frame from described encoding code stream;
Edge frame decoder module 703 is used for the encoding code stream of edge frame is converted to dot matrix format from vector format, generates edge frame;
Residual frame decoder module 704 is used for the encoding code stream of residual frame is decoded, and generates residual frame;
Output processing module 705 is used for edge frame and residual frame are superposeed frame by frame, the original image of output cartoon video.
Among the embodiment, decoder module 703 can also be used for before the encoding code stream with edge frame is converted to dot matrix format from vector format, carried out the lossless compress decoding, generated edge frame.
Based on same inventive concept, the embodiment of the invention also provides a kind of cartoon video compression coding and decoding system, and its structure can comprise as shown in Figure 8:
Encoder 801 is used for the original image of cartoon video is carried out edge extracting, and the edge that extracts is defined as edge frame, and original image and the edge frame of cartoon video subtracted each other the acquisition residual frame; To be converted to the encoding code stream of the edge frame that vector format generates, the encoding code stream stack of the residual frame that generates by residual frame is encoded, the encoding code stream of output cartoon video from dot matrix format by edge frame;
Decoder 802 is used to receive the encoding code stream of cartoon video, isolates the encoding code stream of edge frame and the encoding code stream of residual frame from described encoding code stream; To be converted to edge frame that dot matrix format generates, superpose the original image of output cartoon video by the residual frame that generates that the encoding code stream of residual frame is decoded frame by frame from vector format by the encoding code stream of edge frame.
To sum up, the embodiment of the invention provides a cover the complete code decode algorithm that is suitable for the cartoon video characteristics.This algorithm has made full use of the performance of video compression algorithm and polar plot, and edge in the cartoon image and non-edge part are carried out independent compression, has reduced encoder bit rate to the full extent, helps carrying out based on the video communication service of cartoon video.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (12)
1. the compaction coding method of a cartoon video is characterized in that, this method comprises:
Original image to cartoon video carries out edge extracting, and the edge that extracts is defined as edge frame, and original image and the edge frame of cartoon video subtracted each other the acquisition residual frame;
Will by edge frame from dot matrix format be converted to the edge frame that vector format generates encoding code stream, with the encoding code stream stack of the residual frame that generates that residual frame is encoded, the encoding code stream of output cartoon video.
2. the method for claim 1 is characterized in that, described edge with extraction is defined as edge frame and further comprises:
The edge that extracts is carried out the light tone separating treatment;
The luminance component at edge is defined as edge frame.
3. the method for claim 1 is characterized in that, describedly is converted to the encoding code stream that vector format generates edge frame by edge frame from dot matrix format and comprises:
After dot matrix format is converted to vector format, further carry out lossless compression-encoding by edge frame, generate the encoding code stream of edge frame.
4. the method for claim 1 is characterized in that, this method further comprises:
The flag bit of the encoding code stream of the encoding code stream of distinguishing edge frame and residual frame is set, as the foundation of decoding in the encoding code stream frame head of cartoon video.
5. the comprssing coding/decoding method of a cartoon video is characterized in that, this method comprises:
Receive the encoding code stream of cartoon video, from described encoding code stream, isolate the encoding code stream of edge frame and the encoding code stream of residual frame; Wherein, described edge frame is: the original image to cartoon video carries out edge extracting, the determined frame in the edge of extraction; Described residual frame is: the original image and the edge frame of cartoon video are subtracted each other the frame that is obtained;
To be converted to edge frame that dot matrix format generates, superpose the original image of output cartoon video by the residual frame that generates that the encoding code stream of residual frame is decoded frame by frame from vector format by the encoding code stream of edge frame.
6. method as claimed in claim 5, it is characterized in that, the flag bit of the encoding code stream of the differentiation edge frame that is provided with in the encoding code stream frame head according to cartoon video and the encoding code stream of residual frame is isolated the encoding code stream of edge frame and the encoding code stream of residual frame from described encoding code stream.
7. method as claimed in claim 5, it is characterized in that, described encoding code stream by edge frame is converted to dot matrix format generation edge frame from vector format and further comprises: the encoding code stream with edge frame carries out the lossless compress decoding earlier, is converted to dot matrix format from vector format again, generates edge frame.
8. a cartoon video condensing encoder is characterized in that, comprising:
The edge extracting module is used for the original image of cartoon video is carried out edge extracting, and the edge that extracts is defined as edge frame, and original image and the edge frame of cartoon video subtracted each other the acquisition residual frame;
The edge frame coding module is used for edge frame is converted to vector format from dot matrix format, generates the encoding code stream of edge frame;
The residual frame coding module is used for residual frame is encoded, and generates the encoding code stream of residual frame;
Output processing module is used for the encoding code stream of edge frame and the encoding code stream stack of residual frame, the encoding code stream of output cartoon video.
9. cartoon video condensing encoder as claimed in claim 8 is characterized in that, described edge frame coding module be further used for edge frame after dot matrix format is converted to vector format, carry out lossless compression-encoding, generate the encoding code stream of edge frame.
10. a cartoon video compression decoder is characterized in that, comprising:
Receiver module is used to receive the encoding code stream of cartoon video;
Separation module is used for isolating the encoding code stream of edge frame and the encoding code stream of residual frame from described encoding code stream; Wherein, described edge frame is: the original image to cartoon video carries out edge extracting, the determined frame in the edge of extraction; Described residual frame is: the original image and the edge frame of cartoon video are subtracted each other the frame that is obtained;
The edge frame decoder module is used for the encoding code stream of edge frame is converted to dot matrix format from vector format, generates edge frame;
The residual frame decoder module is used for the encoding code stream of residual frame is decoded, and generates residual frame;
Output processing module is used for edge frame and residual frame are superposeed frame by frame, the original image of output cartoon video.
11. cartoon video compression decoder as claimed in claim 10 is characterized in that, described edge frame decoder module was further used for before the encoding code stream with edge frame is converted to dot matrix format from vector format, carried out the lossless compress decoding, generated edge frame.
12. a cartoon video compression coding and decoding system is characterized in that, comprising:
Encoder is used for the original image of cartoon video is carried out edge extracting, and the edge that extracts is defined as edge frame, and original image and the edge frame of cartoon video subtracted each other the acquisition residual frame; To be converted to the encoding code stream of the edge frame that vector format generates, the encoding code stream stack of the residual frame that generates by residual frame is encoded, the encoding code stream of output cartoon video from dot matrix format by edge frame;
Decoder is used to receive the encoding code stream of cartoon video, isolates the encoding code stream of edge frame and the encoding code stream of residual frame from described encoding code stream; To be converted to edge frame that dot matrix format generates, superpose the original image of output cartoon video by the residual frame that generates that the encoding code stream of residual frame is decoded frame by frame from vector format by the encoding code stream of edge frame.
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