US20080089421A1 - Signal compressing signal - Google Patents
Signal compressing signal Download PDFInfo
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- US20080089421A1 US20080089421A1 US11/873,282 US87328207A US2008089421A1 US 20080089421 A1 US20080089421 A1 US 20080089421A1 US 87328207 A US87328207 A US 87328207A US 2008089421 A1 US2008089421 A1 US 2008089421A1
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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
- H04N19/189—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the adaptation method, adaptation tool or adaptation type used for the adaptive coding
- H04N19/192—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the adaptation method, adaptation tool or adaptation type used for the adaptive coding the adaptation method, adaptation tool or adaptation type being iterative or recursive
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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
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/129—Scanning of coding units, e.g. zig-zag scan of transform coefficients or flexible macroblock ordering [FMO]
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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
- H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
- H04N19/146—Data rate or code amount at the encoder output
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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
- H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
- H04N19/146—Data rate or code amount at the encoder output
- H04N19/15—Data rate or code amount at the encoder output by monitoring actual compressed data size at the memory before deciding storage at the transmission buffer
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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
- H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
- H04N19/146—Data rate or code amount at the encoder output
- H04N19/152—Data rate or code amount at the encoder output by measuring the fullness of the transmission buffer
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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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- 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
- H04N19/18—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 a set of transform coefficients
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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
- H04N19/46—Embedding additional information in the video signal during the compression process
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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
- H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
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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
- H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
- H04N19/61—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding
Definitions
- the present invention relates to a signal compressing system.
- a system according to the present invention is particularly suited for compressing image signals.
- the present disclosure is based on the disclosure in Korean Patent Application No. 92-3398 filed Feb. 29, 1992, which disclosure is incorporated herein by reference.
- Image signals may be compressed by motion-compensated interframe discrete cosine transform (DCT) coding such as is defined by a MPEG (Moving Picture Expert Group) international standard. This form of signal compression has attracted much attention in the field of high definition television (HDTV).
- DCT motion-compensated interframe discrete cosine transform
- FIG. 1 is a block diagram of such a conventional motion-compensated interframe DCT coder.
- an image signal is divided into a plurality of sub-blocks.
- the sub-blocks are all of the same size, for example 8 ⁇ 8, 16 ⁇ 16, . . . .
- a motion estimator 40 produces a motion vector, defined by the difference between the current image signal and a one-frame delayed image signal, output by a frame memory 30 .
- the motion vector is supplied to a motion compensator 50 which compensates the delayed image signal from the frame memory 30 on the basis of the motion vector.
- a first adder 8 a serves to produce the difference between the present frame and the delayed, motion compensated frame.
- a discrete cosine transform portion 10 processes the difference signal, output by the first adder 8 a, for a sub-block.
- the motion estimator 40 determines the motion vector by using a block matching algorithm.
- the discrete cosine transformed signal is quantized by a quantizer 20 .
- the image signal is scanned in a zig-zag manner to produce a runlength coded version thereof.
- the runlength coded signal comprises a plurality of strings which include a series of “0”s, representing the run length, and an amplitude value of any value except “0”.
- the runlength coded signal is dequantized by a dequantizer 21 , inversely zig-zag scanned and inversely discrete cosine transformed by an inverse discrete cosine transforming portion 11 .
- the transformed image signal is added to the motion-compensated estimate error signal by a second adder 8 b. As a result the image signal is decoded into a signal corresponding to the original image signal.
- Refresh switches RSW 1 , RSW 2 are arranged between the adders 8 a, 8 b and the motion compensator 40 so as to provide the original image signal free from externally induced errors.
- the runlength coded signal is also supplied to a variable length coder 60 which applies a variable length coding to the runlength coded image signal.
- the variable length coded signal is then output through a FIFO transfer buffer 70 as a coded image signal.
- the interframe signal can be easily estimated or coded by way of motion compensation, thereby obtaining a high coding efficiency, since the image signal has a relatively high correlation along the time axis. That is, according to the afore-mentioned method, the coding efficiency is high because most of the energy of a discrete cosine transformed signal is compressed at the lower end of its spectrum, resulting in long runs of “0”s in the runlength coded signal.
- the scanning regime of the aforementioned method does not take account of differences in the spectrum of the motion-compensated interframe DCT signal with time.
- a method is known wherein one of a plurality of reference modes is previously selected on the basis of the difference between the present block and that of a previous frame and the image signal is scanned by way of a scanning pattern under the selected mode and suitably quantized.
- three modes are employed to compute the energies of the intermediate and high frequency components of the image signal in accordance with the interframe or the intraframe modes in order to determine the appropriate mode. This mode determining procedure is undesirably complicated.
- a signal compressing system comprising coding means for scanning an input signal according to a plurality of different scanning patterns to provided coded versions thereof and selection means for selecting a said scanning pattern which produces efficient coding according to a predetermined criterion and outputting a scanning pattern signal identifying the selected scanning pattern.
- the input signal is an inherently two-dimensional signal, for example, an image signal.
- the coding means codes the input signal according to a runlength coding regime.
- the system includes a variable length coder to variably length code the coded signal, produced by scanning according to the selected scanning pattern.
- the system includes discrete cosine transformer means to produce said input signal.
- the transformer means may be a motion-compensated interframe adaptive discrete cosine transformer.
- FIG. 1 is a block diagram of a conventional adaptive interframe DCT coding system employing a motion compensating technique
- FIG. 2 is a block diagram of a coding system embodying the present invention
- FIGS. 3A-3H show various possible scanning patterns according to the present invention.
- FIG. 4 is a block diagram of a decoding system according to the present invention.
- an input signal is divided into equal-sized sub-blocks, for example, 8 ⁇ 8, 16 ⁇ 16, . . . .
- a motion estimator 40 determines a motion vector by comparing the current frame and a one frame delayed signal from a frame memory 30 .
- the motion vector is supplied to a motion compensator 60 which, in turn, compensates the delayed frame signal for movement.
- a first adder 8 a produces a difference signal representing the difference between the present frame and the delayed, motion-compensated frame.
- a DCT coder 10 DCT-codes the difference signal.
- the DCT coded image signal is quantized by a quantizer 20 and then dequantized by a dequantizer 21 .
- the dequantized signal is supplied to a second adder 8 b, via IDCT 11 , which adds it to the output of the motion compensator 11 . This produces a signal corresponding to the original image signal.
- the output of the motion compensator 50 is applied to the adders 8 a, 8 b by refresh switches RSW 2 and RSW 1 , respectively.
- the quantized image signal is also supplied to a multi-scanner 80 which scans it according to a plurality of predetermined patterns.
- a scanner pattern selector 90 selects the scanning pattern which produces the minimum number of bits to represent the current sub-block.
- the scanning pattern selector also produces selection data which identifies the selected scanning pattern.
- the image signal output by the scanning pattern selector 90 is variable length coded by a variable length coder 60 .
- the variable length coder 60 compresses the image signal output by the scanning pattern selector 90 .
- the variable length coder 60 operates such that a large proportion of the data samples are each represented by a small number of bits while a small proportion of the data samples are each represented by a large number of bits.
- variable length coded signal and the selection data are supplied to a multiplexer MUX 1 which multiplexes the variable length coded signal and the selection data, and optionally additional information such as teletext.
- variable length coded signal has data words of different lengths
- a transfer buffer 70 is employed to temporarily store the multiplexed signal and output it at a constant rate.
- FIG. 4 shows a decoding system at a remote station that receives and extracts the encoded data.
- demultiplexer 100 receives coded data and, in an operation inverse to that performed at the coding system, extracts the variable length encoded data, the scanning pattern information and the additional information that had been multiplexed together at the coding system.
- Variable length decoder 110 variable length decodes the variable length encoded data
- scanner 120 receives the variable length decoded data and reconstructs the original sub-block using a scanning pattern indicated by the extracted scanning pattern selection signal. The scanner would necessarily have to select one from a plurality pattern that was available for encoding.
- dequantizer 120 dequantizes the signal output from the scanner 120 , and inverse discrete cosine transformer 140 performs an inverse discrete cosine transform function on the output of dequantizer 130 , to output decoded data.
- the original image signal is reconstructed at a remote station by performing the appropriate inverse scanning of the runlength coded signal in accordance with the multiplexed scanning pattern selection data.
- FIGS. 3A to 3 H show possible scanning patterns employed by the multi-scanner 80 . Additional scanning patterns will be apparent to those skilled in the art. However, if the number of patterns becomes too large, the coding efficiency is degraded as the selection data word becomes longer.
- the quantized image signal is scanned according to various scanning patterns, and then the most efficient pattern is selected.
- a suitable measure of efficiency is the number of bits required to runlength code the image signal.
Abstract
A multi-scanner scans a signal according to several different patterns. A scanning pattern selector determines which scanning pattern produced the most efficient coding result, for example, for runlength coding, and outputs a coded signal, coded most efficiently, and a selection signal which identifies the scanning pattern found to be most efficient.
Description
- This is a Continuation of application Ser. No. 10/612,013, filed Jul. 3, 2003; which is a Continuation of application Ser. No. 09/703,649, filed Nov. 2, 2000; which is a Continuation of application Ser. No. 08/024,305, filed Mar. 1, 1993; the disclosures of which are incorporated herein by reference.
- The present invention relates to a signal compressing system. A system according to the present invention is particularly suited for compressing image signals. The present disclosure is based on the disclosure in Korean Patent Application No. 92-3398 filed Feb. 29, 1992, which disclosure is incorporated herein by reference.
- Image signals may be compressed by motion-compensated interframe discrete cosine transform (DCT) coding such as is defined by a MPEG (Moving Picture Expert Group) international standard. This form of signal compression has attracted much attention in the field of high definition television (HDTV).
-
FIG. 1 is a block diagram of such a conventional motion-compensated interframe DCT coder. In the shown coder, an image signal is divided into a plurality of sub-blocks. The sub-blocks are all of the same size, for example 8×8, 16×16, . . . . Amotion estimator 40 produces a motion vector, defined by the difference between the current image signal and a one-frame delayed image signal, output by aframe memory 30. The motion vector is supplied to amotion compensator 50 which compensates the delayed image signal from theframe memory 30 on the basis of the motion vector. Afirst adder 8 a serves to produce the difference between the present frame and the delayed, motion compensated frame. A discretecosine transform portion 10 processes the difference signal, output by thefirst adder 8 a, for a sub-block. Themotion estimator 40 determines the motion vector by using a block matching algorithm. - The discrete cosine transformed signal is quantized by a
quantizer 20. The image signal is scanned in a zig-zag manner to produce a runlength coded version thereof. The runlength coded signal comprises a plurality of strings which include a series of “0”s, representing the run length, and an amplitude value of any value except “0”. - The runlength coded signal is dequantized by a
dequantizer 21, inversely zig-zag scanned and inversely discrete cosine transformed by an inverse discretecosine transforming portion 11. The transformed image signal is added to the motion-compensated estimate error signal by asecond adder 8 b. As a result the image signal is decoded into a signal corresponding to the original image signal. - Refresh switches RSW1, RSW2 are arranged between the
adders motion compensator 40 so as to provide the original image signal free from externally induced errors. - The runlength coded signal is also supplied to a
variable length coder 60 which applies a variable length coding to the runlength coded image signal. The variable length coded signal is then output through aFIFO transfer buffer 70 as a coded image signal. - In motion-compensated adaptive DCT coding, the interframe signal can be easily estimated or coded by way of motion compensation, thereby obtaining a high coding efficiency, since the image signal has a relatively high correlation along the time axis. That is, according to the afore-mentioned method, the coding efficiency is high because most of the energy of a discrete cosine transformed signal is compressed at the lower end of its spectrum, resulting in long runs of “0”s in the runlength coded signal.
- However, the scanning regime of the aforementioned method does not take account of differences in the spectrum of the motion-compensated interframe DCT signal with time.
- A method is known wherein one of a plurality of reference modes is previously selected on the basis of the difference between the present block and that of a previous frame and the image signal is scanned by way of a scanning pattern under the selected mode and suitably quantized. With such a method, however, three modes are employed to compute the energies of the intermediate and high frequency components of the image signal in accordance with the interframe or the intraframe modes in order to determine the appropriate mode. This mode determining procedure is undesirably complicated.
- According to the present invention, there is provided a signal compressing system, comprising coding means for scanning an input signal according to a plurality of different scanning patterns to provided coded versions thereof and selection means for selecting a said scanning pattern which produces efficient coding according to a predetermined criterion and outputting a scanning pattern signal identifying the selected scanning pattern.
- Preferably, the input signal is an inherently two-dimensional signal, for example, an image signal.
- Preferably, the coding means codes the input signal according to a runlength coding regime.
- Preferably, the system includes a variable length coder to variably length code the coded signal, produced by scanning according to the selected scanning pattern.
- Preferably, the system includes discrete cosine transformer means to produce said input signal. The transformer means may be a motion-compensated interframe adaptive discrete cosine transformer.
- An embodiment of the present invention will now be described, by way of example, with reference to
FIGS. 2 and 3 of the accompanying drawings, in which: -
FIG. 1 is a block diagram of a conventional adaptive interframe DCT coding system employing a motion compensating technique; -
FIG. 2 is a block diagram of a coding system embodying the present invention; -
FIGS. 3A-3H show various possible scanning patterns according to the present invention; and -
FIG. 4 is a block diagram of a decoding system according to the present invention. - Referring to
FIG. 2 , an input signal is divided into equal-sized sub-blocks, for example, 8×8, 16×16, . . . . Amotion estimator 40 determines a motion vector by comparing the current frame and a one frame delayed signal from aframe memory 30. - The motion vector is supplied to a
motion compensator 60 which, in turn, compensates the delayed frame signal for movement. Afirst adder 8 a produces a difference signal representing the difference between the present frame and the delayed, motion-compensated frame. ADCT coder 10 DCT-codes the difference signal. The DCT coded image signal is quantized by aquantizer 20 and then dequantized by adequantizer 21. The dequantized signal is supplied to asecond adder 8 b, via IDCT 11, which adds it to the output of themotion compensator 11. This produces a signal corresponding to the original image signal. - The output of the
motion compensator 50 is applied to theadders - The quantized image signal is also supplied to a multi-scanner 80 which scans it according to a plurality of predetermined patterns.
- A
scanner pattern selector 90 selects the scanning pattern which produces the minimum number of bits to represent the current sub-block. The scanning pattern selector also produces selection data which identifies the selected scanning pattern. - The image signal output by the
scanning pattern selector 90 is variable length coded by avariable length coder 60. Thevariable length coder 60 compresses the image signal output by thescanning pattern selector 90. Thevariable length coder 60 operates such that a large proportion of the data samples are each represented by a small number of bits while a small proportion of the data samples are each represented by a large number of bits. - When a discrete cosine transformed image signal is quantized and runlength coded, the number of “0”s is increased over all, while the number of “0”s decreases as the magnitude of the signal increases. Accordingly, data compression is achieved because “0” can be represented by only a few bits and “255” can be represented by a relatively large number of bits.
- Both the variable length coded signal and the selection data are supplied to a multiplexer MUX1 which multiplexes the variable length coded signal and the selection data, and optionally additional information such as teletext.
- Since the variable length coded signal has data words of different lengths, a
transfer buffer 70 is employed to temporarily store the multiplexed signal and output it at a constant rate. -
FIG. 4 shows a decoding system at a remote station that receives and extracts the encoded data. InFIG. 4 ,demultiplexer 100 receives coded data and, in an operation inverse to that performed at the coding system, extracts the variable length encoded data, the scanning pattern information and the additional information that had been multiplexed together at the coding system.Variable length decoder 110 variable length decodes the variable length encoded data, andscanner 120 receives the variable length decoded data and reconstructs the original sub-block using a scanning pattern indicated by the extracted scanning pattern selection signal. The scanner would necessarily have to select one from a plurality pattern that was available for encoding. Using components having the same margin asdequantizers 21 andIDCT 11 in the encoder system,dequantizer 120 dequantizes the signal output from thescanner 120, and inversediscrete cosine transformer 140 performs an inverse discrete cosine transform function on the output ofdequantizer 130, to output decoded data. - The original image signal is reconstructed at a remote station by performing the appropriate inverse scanning of the runlength coded signal in accordance with the multiplexed scanning pattern selection data.
-
FIGS. 3A to 3H show possible scanning patterns employed by the multi-scanner 80. Additional scanning patterns will be apparent to those skilled in the art. However, if the number of patterns becomes too large, the coding efficiency is degraded as the selection data word becomes longer. - As described above, according to the present invention, the quantized image signal is scanned according to various scanning patterns, and then the most efficient pattern is selected.
- A suitable measure of efficiency is the number of bits required to runlength code the image signal.
Claims (7)
1. A decoder for decompressing a compressed video signal, the compressed video signal containing entropy encoded data representing a set of video spatial frequency coefficients of an individual sub-block which have been scanned using a selected one of a plurality of different scanning patterns to produce a set of reordered coefficients and also containing a scanning mode signal indicating the selected one of the plurality of different scanning patterns, the decoder comprising:
an entropy decoder operative to decode the entropy encoded data and to output entropy decoded data; and
a scanner operative to scan the entropy decoded data according to the selected one of the plurality of different scanning patterns as indicated by the scanning mode signal,
wherein the plurality of different scanning patterns includes FIG. 3H .
2. The decoder according to claim 1 wherein the entropy encoded data and the scanning mode signal are multiplexed together as part of coded data signal.
3. The decoder according to claim 1 , wherein the entropy encoded data, the scanning mode signal and the additional information are multiplexed together as part of coded data signal, and wherein said decoder further includes a demultiplexer which demultiplexes the entropy encoded data, the scanning mode signal and the additional information.
4. The decoder according to claim 1 , wherein the entropy encoded data is encoded according to a variable length encoding regime.
5. The decoder according to claim 1 , wherein the scanner scans the entropy decoded data according to a runlength decoding regime.
6. The decoder of claim 1 , further comprising a dequantizer which dequantizes the scanned data output by said scanner and outputs dequantized data.
7. The decoder of claim 6 , further comprising an inverse discrete cosine transformer which inverse discrete cosine transforms the dequantized data output by said dequantizer.
Priority Applications (21)
Application Number | Priority Date | Filing Date | Title |
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US11/873,282 US20080089421A1 (en) | 1992-02-29 | 2007-10-16 | Signal compressing signal |
US12/338,647 US7684490B2 (en) | 1992-02-29 | 2008-12-18 | Signal compressing system |
US12/343,797 US7724821B2 (en) | 1992-02-29 | 2008-12-24 | Signal compressing system |
US12/343,898 US7724823B2 (en) | 1992-02-29 | 2008-12-24 | Signal compressing system |
US12/343,839 US7724822B2 (en) | 1992-02-29 | 2008-12-24 | Signal compressing system |
US12/348,535 US7742527B2 (en) | 1992-02-29 | 2009-01-05 | Signal compressing system |
US12/348,581 US7787538B2 (en) | 1992-02-29 | 2009-01-05 | Signal compressing system |
US12/348,590 US7742522B2 (en) | 1992-02-29 | 2009-01-05 | Signal compressing system |
US12/348,539 US7724824B2 (en) | 1992-02-29 | 2009-01-05 | Signal compressing system |
US12/348,510 US7609760B2 (en) | 1992-02-29 | 2009-01-05 | Signal compressing system |
US12/348,621 US7616687B2 (en) | 1992-02-29 | 2009-01-05 | Signal compressing system |
US12/497,264 US7764735B2 (en) | 1992-02-29 | 2009-07-02 | Signal compressing system |
US12/574,255 US20100027620A1 (en) | 1992-02-29 | 2009-10-06 | Signal compressing system |
US12/619,293 US7724829B2 (en) | 1992-02-28 | 2009-11-16 | Signal compressing system |
US12/619,271 US7724828B2 (en) | 1992-02-28 | 2009-11-16 | Signal compressing system |
US12/619,239 US7782956B2 (en) | 1992-02-28 | 2009-11-16 | Signal compressing system |
US12/980,089 US7953149B2 (en) | 1992-02-28 | 2010-12-28 | Signal compressing system |
US12/980,123 US7953150B2 (en) | 1992-02-28 | 2010-12-28 | Signal compressing system |
US12/980,055 US7949045B2 (en) | 1992-02-28 | 2010-12-28 | Signal compressing system |
US12/980,109 US7949046B2 (en) | 1992-02-28 | 2010-12-28 | Signal compressing system |
US12/980,070 US7953148B2 (en) | 1992-02-28 | 2010-12-28 | Signal compressing system |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR92-3398 | 1992-02-28 | ||
KR1019920003398A KR960006762B1 (en) | 1992-02-29 | 1992-02-29 | 2-dimensional data scanning selecting circuit for image coding |
US08/024,305 US6263026B1 (en) | 1992-02-29 | 1993-03-01 | Signal compressing system |
US09/703,649 US6680975B1 (en) | 1992-02-29 | 2000-11-02 | Signal encoding and decoding system and method |
US10/612,013 US7292657B2 (en) | 1992-02-29 | 2003-07-03 | Signal compressing signal |
US11/873,282 US20080089421A1 (en) | 1992-02-29 | 2007-10-16 | Signal compressing signal |
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US08/024,305 Continuation US6263026B1 (en) | 1992-02-28 | 1993-03-01 | Signal compressing system |
US09/703,649 Continuation US6680975B1 (en) | 1992-02-28 | 2000-11-02 | Signal encoding and decoding system and method |
US10/612,013 Continuation US7292657B2 (en) | 1992-02-28 | 2003-07-03 | Signal compressing signal |
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US12/338,647 Continuation US7684490B2 (en) | 1992-02-29 | 2008-12-18 | Signal compressing system |
US12/343,839 Continuation US7724822B2 (en) | 1992-02-29 | 2008-12-24 | Signal compressing system |
US12/343,797 Continuation US7724821B2 (en) | 1992-02-29 | 2008-12-24 | Signal compressing system |
US12/343,898 Continuation US7724823B2 (en) | 1992-02-29 | 2008-12-24 | Signal compressing system |
US12/348,621 Continuation US7616687B2 (en) | 1992-02-28 | 2009-01-05 | Signal compressing system |
US12/348,510 Continuation US7609760B2 (en) | 1992-02-29 | 2009-01-05 | Signal compressing system |
US12/348,535 Continuation US7742527B2 (en) | 1992-02-29 | 2009-01-05 | Signal compressing system |
US12/348,581 Continuation US7787538B2 (en) | 1992-02-29 | 2009-01-05 | Signal compressing system |
US12/348,590 Continuation US7742522B2 (en) | 1992-02-29 | 2009-01-05 | Signal compressing system |
US12/348,539 Continuation US7724824B2 (en) | 1992-02-29 | 2009-01-05 | Signal compressing system |
US12/497,264 Continuation US7764735B2 (en) | 1992-02-29 | 2009-07-02 | Signal compressing system |
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US7764735B2 (en) | 2010-07-27 |
US7292657B2 (en) | 2007-11-06 |
US20040096001A1 (en) | 2004-05-20 |
US6680975B1 (en) | 2004-01-20 |
US20090257511A1 (en) | 2009-10-15 |
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