CN1615024A - Visual frequency coding controlling method based on ripple convertion - Google Patents
Visual frequency coding controlling method based on ripple convertion Download PDFInfo
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Abstract
The method includes following steps: a) the numbers of initial bit plane layer of encoding code flow are determined; b) according to the determined initial bit plane layer numbers a frame video image is encoded; it is decided if length of the encoded code flow is less than the current channel band width; if yes, the above encoded code flow is loaded into channel for transmission, and the remaining band width of the channel transmitting the encoded code flow is calculated and is accumulated into the current channel band width, and then the accumulative band width of current channel is acquired; otherwise, the above encoded code flow is extracted as per one bit plane; after extracting , the encoded code flow, which is less than channel accumulating band width, is loaded into channel for transmission.
Description
Technical field
The present invention relates to the encoding code stream control method of video image, particularly relate to a kind of video encoding control method based on wavelet transformation.
Background technology
Since phase late 1980s S.Mallat introduced image processing with wavelet transformation first, wavelet transformation had obtained extensive use with its good time-frequency localization ability and decorrelation ability in image code domain, and has obtained good effect.Usually, the wavelet image cataloged procedure carries out Filtering Processing for using one group of filter bank to original sequence.At first every capable pixel in the image is carried out filtering with low pass filter and high pass filter, the output result of filter is carried out the dot interlace sampling, obtain intermediate image L and H.L is an original image process low pass filter, and dot interlace sampling in the horizontal direction; H is an original image process high pass filter, and dot interlace sampling in the horizontal direction.Next, each row pixel of these two the new images that produce is carried out low pass (Ly) and high pass (Hy) filtering.And carry out the dot interlace sampling.Obtain four number of sub images (LL, LH, HL, HH).This four number of sub images has comprised the full detail of original image, but decomposes by above-mentioned filtering, and the information significance level that each subimage comprises has nothing in common with each other.The LL subimage is continued to apply aforesaid operations, will obtain four number of sub images again.
In the wavelet transformation process, at first choose suitable wavelet mother function and filter, picture signal is implemented wavelet transformation; Secondly the wavelet coefficient after the conversion is carried out quantization encoding, thereby obtain binary character stream; At last symbols streams is carried out entropy coding to obtain the bit stream after the image compression.Wherein, the quantization encoding stage is occupied critical role, and this is because in fact all information loss all occurs in the quantization encoding stage.
At present, the compression standard of multi-media image mostly based on traditional discrete cosine transform (DCT) be used for H.263 standard that low bit-rate video communicates by letter etc.
H.263 be the video encoding and decoding standard that is used for the low bit rate real-time Transmission that international telecommunication association-ITU-T of telecommunication standardization sector (The InternationalTelecommunications Union-Telecommunication Standardization Sector) passed through in nineteen ninety-five.Its design original intention is to satisfy the low bandwidth Video Applications demand that bandwidth is lower than 64kbps, as video conference, video telephone etc.H.263 input video frame format is QCIF (Quarter Common Intermediate Format, size is 176 * 144), CIF (Common Intermediate Format, size is 352 * 288) etc.Each frame of video is divided into many macro blocks (MB-MicroBlock), and each macro block is made up of 4 Y luminance block, 1 Cb chrominance block and 1 Cr chrominance block.The size of piece (Block) is 8 * 8.H.263 with the macro block compression that unit carries out frame of video.
At present, each department communication line situation differs greatly, and consumer survey shows that the consumer respectively has preference to the requirement of picture quality in the video communication and video frame rate.Video coding is owing to adopt the long coding of mutilation, thereby the data transfer rate behind the coding changes, for the requirement that adaptive channel transmits, need control coded video bitstream stream.
H.263 the frame per second control technology that adopts in the coding and decoding video agreement is that the unit is by adjusting encoding code stream length to the different quantification progression of the different macroblock allocation in the two field picture, though reach the purpose of frame per second control with the image macro.But this frame per second control technology needs a code check buffer carry out the equilibrium of code stream, according to the degree of filling of buffer coding is carried out the control of reaction type, when bit stream data in the buffer will be expired, reduces the quantified precision of the DCT coefficient of macro block; Otherwise, improve quantified precision, control the data volume of buffer, ensure that buffer can upper and lowerly not overflow.But, under the very low situation of channel width, employing is that the code stream control method of unit is when selecting quantization parameter to the adjacent macroblocks DCT coefficient of same two field picture with the image macro, used different quantization parameter variable quantities, do the difference that can further strengthen between the adjacent macroblocks quantization error like this, aggravated the blocking effect of decoding end reconstructed image, blocking effect will make the picture quality rapid deterioration.
H.263 improve compression ratio by reducing the redundancy of video sequence in time domain and spatial domain, under low code check condition, video sequence weakens in the correlation of time domain, and code efficiency H.263 must reduce.This piecemeal compress technique based on DCT is under the situation of big compression ratio, and the blocking effect of generation will seriously influence picture quality.Therefore, the prior art shortcoming is: produce blocking effect under low channel width condition, cause the picture quality rapid deterioration.
Summary of the invention
The problem that the present invention solves provides a kind of method of cutting apart sorting coding control based on the hierarchical tree set of wavelet transformation, under various channel width situations, can both be according to the requirement of user to video frame rate, the output code flow of control of video coding effectively provides the video image of high-quality compressed image and higher frame per second.
For addressing the above problem, the invention provides a kind of video encoding control method based on wavelet transformation, comprising:
Determine the initial bit plane number of plies of video coding code stream;
By the initial bit plane number of plies of determining one frame video image is encoded, obtain encoding code stream length;
Judge that whether encoding code stream length is less than current channel width, in this way, described encoding code stream is sent into Channel Transmission, calculating channel transmits this frame remaining bandwidth of encoding code stream simultaneously, and accumulate them into current channel width, obtain current channel cumulative bandwidth; Otherwise, be that unit intercepts with described encoding code stream by bit plane, channel is sent into less than the encoding code stream of channel cumulative bandwidth in the intercepting back transmit.
Wherein, the described initial bit plane number of plies is to divide the back by current channel width by byte to determine with the bit plane initial table that the frame per second combination obtains.
Wherein, described one frame video image the coding by the initial bit plane number of plies of determining comprises:
Raw image data is carried out wavelet transformation, obtain the wavelet conversion coefficient of view data;
Described wavelet conversion coefficient is carried out the hierarchical tree set with the selected initial bit plane number of plies cut apart the ordering quantization encoding.
Wherein, described calculating channel transmits this frame remaining bandwidth of encoding code stream, and accumulates them into current channel width, obtains current channel cumulative bandwidth and specifically comprises:
Calculating channel transmits the remaining bandwidth behind the encoding code stream;
Whether judge the described remaining bandwidth of channel greater than preset threshold, if remaining bandwidth and current channel width addition are obtained current channel cumulative bandwidth, simultaneously with the zero clearing of channel remaining bandwidth; Otherwise, keep this remaining bandwidth, continue during for the next frame image encoding to use.
Wherein, described threshold value is the code stream byte number of one deck monochrome information.
Wherein, described encoding code stream is that unit intercepts specifically and comprises by bit plane:
To the bit plane of intercepting one deck chrominance information earlier of encoding code stream;
Whether judge the length of encoding code stream after the intercepting greater than the channel cumulative bandwidth, in this way, to after the intercepting encoding code stream intercept one deck chromaticity level plane once more; Otherwise, the encoding code stream after the intercepting is sent into channel transmit, finish.
Whether the length of encoding code stream after judgement intercepts once more in this way, intercepts the bit plane of one deck monochrome information greater than the channel cumulative bandwidth, and recovers one deck chromaticity level plane of intercepting once more, otherwise, the encoding code stream after intercepting is sent into channel transmit.
Whether judge the length of encoding code stream after the intercepting for the third time greater than the channel cumulative bandwidth, in this way, to the bit plane of intercepting one deck chrominance information earlier of encoding code stream, otherwise, the encoding code stream after the intercepting is sent into channel transmit.
Wherein, one deck chromaticity level plane of intercepting once more of described recovery specifically comprises: the chrominance information bit-plane data that will be intercepted is once more delivered in the encoding code stream again.
Compared with prior art, the present invention has following beneficial effect: the present invention is the unit with the whole two field picture of video sequence, having replaced traditional with adaptive method is the unit with the image macro in H.263, by the different quantification progression of the different macroblock allocation in the two field picture being adjusted the way of encoding code stream length, make full use of based on wavelet transformation, the code stream control technology of SPIHT, carry out code stream control by increase and decrease image encoding number of bit-planes, can be flexibly according to the wide variation of channel strip and user requirement to video frame rate, the output code flow of control of video coding effectively provides the video image of high-quality compressed image or higher frame per second.In addition, can also be in wider scope the code length of video image be made adjusting (500byte～5000byte), to such an extent as to when channel bandwidth change is big,, thereby can export the video image of stablizing frame per second by control to the video coding output code flow.Particularly the frame rate adjustment scope can obtain the better image quality when 0.5f/s～5f/s.
Description of drawings
Fig. 1 is the flow chart that the present invention is based on the video encoding control method of wavelet transformation;
Fig. 2 is the flow chart of channel width compensation of the present invention;
Fig. 3 is the step-by-step planar interception of the present invention flow chart of encoding code stream.
Embodiment
The invention provides a kind of video encoding control method based on wavelet transformation, its realization flow is: after setting up communication link, connect the amount of bandwidth that speed can calculate current channel in real time by modulator-demodulator Modem.Channel width changes in certain scope, adopt the present invention that the video code flow of one two field picture is carried out flow control, at first table look-up and select the initial bit plane number of plies, then with the described initial bit plane number of plies encoding a two field picture according to channel width and frame per second.Whether carry out the intercepting of bit plane according to the length situation decision of encoding code stream subsequently.The bandwidth surplus that makes full use of each two field picture in the coding of whole video sequence, flow control procedure is made compensation to channel width, thereby makes the decoding end decoding and reconstituting go out to stablize the video image of frame per second.
Further specify the present invention below in conjunction with accompanying drawing.
As shown in Figure 1, at first determine the initial bit plane number of plies (step S11) of video coding code stream; Once more, one frame video image is encoded, obtain encoding code stream length (step S12) by the bit plane of determining; Judge that at last whether encoding code stream length in this way, sends described encoding code stream into Channel Transmission less than current channel cumulative bandwidth (step S13), calculating channel transmits this frame bandwidth surplus (step S14) of encoding code stream simultaneously; Otherwise, be that unit intercepts (step S15) with described encoding code stream by bit plane, channel is sent into less than the encoding code stream of channel cumulative bandwidth in the intercepting back transmit (step S16).
The present invention is based on wavelet transformation, hierarchical tree is gathered the code stream control technology of cutting apart ordering SPIHT coding and a kind of coded video bitstream flow control technology that applies to video terminal.In the image encoding process of wavelet transformation, most of energy of coded image all concentrates on low frequency sub-band, the present invention is cut apart ordering SPIHT coded system to image wavelet transform coefficients by using hierarchical tree set to quantize, this is a kind of gradual method for encoding images, this method is called bit plane (bit plane) method, and the number of bit-planes that the SPIHT coding adopts also can be understood as quantified precision.
And in step S11 of the present invention, at first set according to channel current bandwidth and user's frame per second, table look-up and determine the initial bit plane number of plies of video coding.Be about to the input channel current bandwidth and be divided into 6 grades, obtain a bit plane initial table with 3 kinds of frame per second combinations respectively by byte-sized.The bit plane initial table is as follows, and wherein BX represents that channel current bandwidth, FX represent that frame per second, BPXX represent corresponding positions plane initial value in the form.
Table 1: bit plane initial table
Carrying out step S12 then encodes by the initial bit plane number of plies to a frame video image, at first raw image data is carried out wavelet transformation, then wavelet coefficient is carried out the SPIHT quantization encoding with the selected initial bit plane number of plies, coding can obtain encoding code stream length after finishing.Be specially: at first raw image data is carried out wavelet transformation, promptly initial data image sequence is carried out Filtering Processing, and its output result is carried out the dot interlace sampling, thereby obtain the wavelet conversion coefficient of view data; Then described wavelet conversion coefficient is carried out the coded quantization that ordering SPIHT (Set Partitioningin Hierarchical Trees) is cut apart in the hierarchical tree set by the initial bit plane number of plies, utilize the coefficient distribution character of wavelet transformation, to the quantification that wavelet coefficient approaches one by one, adopt a thresholding sequence T in the quantizing process
0, T
1... T
N-1, come to determine successively the quantization threshold value, wherein, 2T
0＞=| X
Max|, X
MaxBe the maximum value in the wavelet conversion coefficient, thresholding sequential value T
NMultiple with 2 successively decreases successively.Quantized interval within two thresholding intervals is called a bit plane.The number of bit-planes of described SPIHT coding is meant from maximum quantization threshold the number of times that the quantization threshold that successively decreases successively quantizes wavelet coefficient.For example, when the bitplanes number carries out the SPIHT quantification for " 5 ", at first carry out the quantification of ground floor bit plane for the quantization threshold value with T0; And then be the quantification that quantization threshold carries out second layer bit plane with T1; ... quantizing process is performed until the layer 5 bit plane, and promptly quantization threshold is got T4.Hence one can see that, and the quantization threshold of five layers of bit plane is followed successively by: T0, T1, T2, T3, T4.
Again, the cumulative bandwidth of encoded more code length and current channel (channel current bandwidth and channel remaining bandwidth sum), the channel current bandwidth can obtain by the current connection rate calculations of Modem.If encoding code stream length is less than the channel cumulative bandwidth, then will be encoding code stream send into channel and transmit.Write down this frame of Channel Transmission remaining bandwidth behind the encoding code stream simultaneously, promptly channel width is carried out bandwidth compensation, its concrete steps see accompanying drawing 2 for details, comprising:
Step S141: calculating channel transmits the remaining bandwidth behind the encoding code stream;
Step S142: whether judge the described remaining bandwidth of channel greater than preset threshold, if remaining bandwidth and current channel width addition are obtained current channel cumulative bandwidth, simultaneously with channel remaining bandwidth zero clearing (step S143); Otherwise, keep this remaining bandwidth, continue during for the next frame image encoding to use (step S144).
Described step S141 deducts the code length of encoding with the channel cumulative bandwidth, and described residue is added in the channel remaining bandwidth of previous frame image encoding, and preserve, when doing the control of next frame image code stream, judge that whether the channel remaining bandwidth is greater than preset threshold (step S142) earlier, described threshold value is defined as the code stream byte number of one deck luminance Y component, so that can at least do one deck luminance Y component bit plane or one deck colourity (UV) component bit plane during the next frame image encoding more.If greater than threshold value, then remaining bandwidth and the addition of current channel actual bandwidth are obtained current channel cumulative bandwidth, simultaneously with the zero clearing of channel remaining bandwidth; If less than threshold value, then not with the addition of channel actual bandwidth, keep this remaining bandwidth value, stay when doing the next frame image encoding and to continue to use.
If encoding code stream length is greater than the channel cumulative bandwidth, then encoding code stream is that long measure intercepts with the bit plane.See accompanying drawing 3 for details, be the present invention's flow chart that to be unit with the bit plane intercept encoding code stream, comprising:
Step S151: to the bit plane of intercepting one deck chrominance information earlier of encoding code stream;
Step S152: whether judge the length of encoding code stream after the intercepting greater than the channel cumulative bandwidth, in this way, to after the intercepting encoding code stream intercept one deck chromaticity level plane (step S153) for the second time; Otherwise, the encoding code stream after the intercepting is sent into channel transmit (step S157), finish.
Step S154: whether the length of encoding code stream after the judgement intercepting for the second time is greater than the channel cumulative bandwidth, in this way, recover one deck chromaticity level plane of intercepting once more, and the bit plane (step S155) of intercepting one deck monochrome information, otherwise, the encoding code stream after the intercepting is sent into channel transmits (step S157).
Step S156: whether judge the length of encoding code stream after the intercepting for the third time greater than the channel cumulative bandwidth, in this way execution in step S151), otherwise, the encoding code stream after the intercepting is sent into channel transmit.
In above-mentioned flow process, at first to the bit plane of the intercepting one deck chrominance information of encoding code stream (UV component), if the code stream length after the intercepting is still greater than the channel cumulative bandwidth, then intercept one deck chromaticity level plane once more, if still greater than the channel cumulative bandwidth, then intercept the bit plane of one deck monochrome information (Y component), and chrominance information (UV component) bit-plane data that will be intercepted once more re-enters in the encoding code stream.Handle encoding code stream in this way, satisfy the channel requirement,, just can send into channel and transmit promptly less than the cumulative bandwidth of channel up to encoding code stream length.
The characteristics of wavelet transformation, SPIHT image coding technique have been utilized in the implementation procedure of the present invention, promptly whole two field picture unified quantization, the compensation of bandwidth surplus and brightness and chrominance information are handled respectively, to such an extent as under various channel width situations, can both be according to the requirement of user to video frame rate, the output code flow of control of video coding effectively provides the video image of excellent picture quality or higher frame per second.
The process that whole two field picture unified quantization, the compensation of bandwidth surplus and brightness described in the present invention and chrominance information are handled respectively is described further below, and is as follows,
Described whole two field picture unified quantization: the code stream control method based on wavelet transformation, SPIHT coding has utilized the Bit-Plane Encoding principle to carry out code stream control, mainly be the coefficient distribution character that utilizes wavelet transformation, the quantification that wavelet coefficient is approached one by one once determines to quantize progression.Quantization parameter during so H.263 number of bit-planes described in the invention corresponds to.But be different from quantization strategy H.263, the bit plane of wavelet transformation, SPIHT video coding is to be the unit with whole two field picture among the present invention.Code stream control method based on small echo, SPIHT coding carries out code stream control by increase and decrease image encoding number of bit-planes, can be according to the requirement of user video frame per second, and the output code flow of control of video coding effectively.And quantization strategy H.263 is to be that the unit is by adjusting encoding code stream length to the different quantification progression of the different macroblock allocation in the two field picture with the image macro.But be that the code stream control method of unit is when selecting quantization parameter to the adjacent macroblocks DCT coefficient of same two field picture with the image macro, used different quantization parameter variable quantities, do the difference that can further strengthen between the adjacent macroblocks quantization error like this, aggravated the blocking effect of decoding end reconstructed image, blocking effect will make the picture quality rapid deterioration.Therefore, the present invention has guaranteed picture quality uniformity on the whole, has avoided the blocking effect phenomenon that produces in the block-based Video Coding Scheme such as H.263 waiting, thereby has improved the quality of video image.
Described bandwidth surplus compensation: before carrying out two field picture coding, at first, determine the number of bit-planes that coding is done according to the frame per second of current channel width and user's selection.Because conditions such as the complexity in different images source and intensity of illumination have nothing in common with each other, even determined the encoded bitplane number before the coding, the code stream difference in length that different image encodings is obtained also will be bigger.For the length of encoding code stream that makes transmission to greatest extent near channel width, encoding code stream length and channel cumulative bandwidth compare, code length is greater than the channel cumulative bandwidth if encoded, be that unit intercepts encoding code stream by bit plane then, the stream of the encoding code stream length after intercepting meets the channel width requirement.If encoding code stream is less than the channel cumulative bandwidth, then direct encoding code stream is sent into Channel Transmission.Simultaneously, calculate the bandwidth surplus of this two field picture code stream of Channel Transmission.Carrying out next frame image code stream when control, before bandwidth surplus is being added in the current channel width.The present invention is to be that unit carries out code stream control with the SPIHT encoded bitplane.Therefore, the code stream length of encoding through each frame of code stream control will be around the slightly fluctuation up and down of current channel width.Owing to introduced the compensation of bandwidth surplus in the process of code stream control, for one section video sequence, average code stream length and channel width can access good coupling.
Described brightness and chrominance information are handled respectively, and small echo, SPIHT coding are that the brightness that will put in order two field picture separates encoding process with chrominance information.Therefore, when carrying out code stream control, can utilize the human eye visual characteristic responsive more, at first control the chrominance information in the encoding code stream monochrome information.Under the extremely low situation of channel width, even can reduce chrominance information significantly, keep monochrome information as far as possible, guarantee the quality of reconstructed image to the full extent.
Therefore, The present invention be directed to Wavelet image coding techniques and habits of consumers characteristics, satisfied the requirement of picture quality and channel width simultaneously, the line condition of various complexity is all had stronger adaptability.Simulate various channel width conditions by experiment, use this code stream controlling schemes all can under the prerequisite that keeps the better image quality, obtain stablizing the video output of frame per second simultaneously by the frame per second requirement.Thereby, under various channel width situations, can both be according to the requirement of user to video frame rate, the output code flow of control of video coding effectively provides the video image of high-quality compressed image or higher frame per second.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (7)
1, a kind of video encoding control method based on wavelet transformation is characterized in that, comprising:
A, determine the initial bit plane number of plies of video coding code stream;
B, one frame video image is encoded, obtain encoding code stream length by the initial bit plane number of plies of determining;
C, judge that whether encoding code stream length is less than current channel width, in this way, described encoding code stream is sent into Channel Transmission, calculating channel transmits this frame remaining bandwidth of encoding code stream simultaneously, and accumulate them into current channel width, obtain current channel cumulative bandwidth; Otherwise, be that unit intercepts with described encoding code stream by bit plane, channel is sent into less than the encoding code stream of channel cumulative bandwidth in the intercepting back transmit.
According to the described video encoding control method of claim 1, it is characterized in that 2, the described initial bit plane number of plies is to determine with the bit plane initial table that the frame per second combination obtains by current channel width is divided the back by byte based on wavelet transformation.
According to the described video encoding control method of claim 2, it is characterized in that 3, by the initial bit plane number of plies of determining one frame video image being encoded among the described step B comprises based on wavelet transformation:
(31) raw image data is carried out wavelet transformation, obtain the wavelet conversion coefficient of view data;
(32) described wavelet conversion coefficient is carried out the hierarchical tree set with the selected initial bit plane number of plies and cut apart the ordering quantization encoding.
4, according to the described video encoding control method of claim 3 based on wavelet transformation, it is characterized in that, calculate this frame of Channel Transmission remaining bandwidth of encoding code stream among the described step C, and accumulate them into current channel width, obtain current channel cumulative bandwidth and specifically comprise:
(41) calculating channel transmits the remaining bandwidth behind the encoding code stream;
(42) whether judge described channel remaining bandwidth greater than preset threshold, if remaining bandwidth and current channel width addition are obtained current channel cumulative bandwidth, simultaneously with the zero clearing of channel remaining bandwidth; Otherwise, keep this remaining bandwidth, continue during for the next frame image encoding to use.
According to the described video encoding control method of claim 4, it is characterized in that 5, described threshold value is the code stream byte number of one deck monochrome information based on wavelet transformation.
According to the described video encoding control method of claim 1, it is characterized in that 6, described encoding code stream is that unit intercepts specifically and comprises by bit plane based on wavelet transformation:
(61) to the bit plane of intercepting one deck chrominance information earlier of encoding code stream;
(62) whether judge the length of encoding code stream after the intercepting greater than the channel cumulative bandwidth, in this way, to after the intercepting encoding code stream intercept one deck chromaticity level plane once more; Otherwise, the encoding code stream after the intercepting is sent into channel transmit, finish.
(63) whether the length of encoding code stream after judgement intercepts once more in this way, intercepts the bit plane of one deck monochrome information greater than the channel cumulative bandwidth, and recovers one deck chromaticity level plane of intercepting once more, otherwise, the encoding code stream after intercepting is sent into channel transmit.
(64) whether judge the length of encoding code stream after the intercepting for the third time greater than the channel cumulative bandwidth, execution in step (61) in this way, otherwise, the encoding code stream after the intercepting is sent into channel transmit.
According to the described video encoding control method based on wavelet transformation of claim 6, it is characterized in that 7, one deck chromaticity level plane that described recovery intercepts once more specifically comprises: the chrominance information bit-plane data that will be intercepted is once more delivered in the encoding code stream again.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101082989B (en) * | 2006-05-29 | 2011-05-18 | 联咏科技股份有限公司 | Method and device for area intercepting encode |
| CN102244552A (en) * | 2010-05-13 | 2011-11-16 | 中兴通讯股份有限公司 | Method and device for transmitting and receiving data |
| CN101686382B (en) * | 2008-09-24 | 2012-05-30 | 宏碁股份有限公司 | Video signal processing method and video signal system |
| CN111556318A (en) * | 2020-04-24 | 2020-08-18 | 西安万像电子科技有限公司 | Data transmission method and device |
| CN113891097A (en) * | 2021-10-27 | 2022-01-04 | 西安邮电大学 | Code stream prediction method and system based on wavelet transformation |
-
2004
- 2004-12-03 CN CN 200410096679 patent/CN1277418C/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101082989B (en) * | 2006-05-29 | 2011-05-18 | 联咏科技股份有限公司 | Method and device for area intercepting encode |
| CN101686382B (en) * | 2008-09-24 | 2012-05-30 | 宏碁股份有限公司 | Video signal processing method and video signal system |
| CN102244552A (en) * | 2010-05-13 | 2011-11-16 | 中兴通讯股份有限公司 | Method and device for transmitting and receiving data |
| WO2011140734A1 (en) * | 2010-05-13 | 2011-11-17 | 中兴通讯股份有限公司 | Method and device for sending and receiving data |
| CN111556318A (en) * | 2020-04-24 | 2020-08-18 | 西安万像电子科技有限公司 | Data transmission method and device |
| CN113891097A (en) * | 2021-10-27 | 2022-01-04 | 西安邮电大学 | Code stream prediction method and system based on wavelet transformation |
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| C06 | Publication | ||
| PB01 | Publication | ||
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