WO2005006766A1 - 動画像符号化方法、動画像復号方法、動画像符号化装置、動画像復号装置およびコンピュータプログラム - Google Patents
動画像符号化方法、動画像復号方法、動画像符号化装置、動画像復号装置およびコンピュータプログラム Download PDFInfo
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Definitions
- Moving picture coding method moving picture decoding method, moving picture coding apparatus, moving picture decoding apparatus and computer program
- the present invention relates to a moving image encoding / decoding method, a moving image encoding Z decoding device, and their computer program.
- Subband coding is a method of frequency-dividing an image signal and performing encoding processing on signals (subband signals) of respective frequency bands.
- Subband coding differs from block-based orthogonal transformation such as discrete cosine transformation, and in principle there is no block distortion in principle, and it has the feature that hierarchical coding can be easily realized by recursively dividing low-pass components. .
- subband coding using wavelet transform is adopted in JPEG 2000, which is an international standard coding method.
- Subband video coding is mainly performed by performing motion compensation in the spatial domain on the original image to remove correlation in the temporal direction, and then performing subband coding on each frame; After sub-band division, there are two types of methods for performing motion compensation for each sub-band region to remove correlation in the time direction.
- FIG. 25 shows a conventional coding process that performs motion compensation in the spatial domain
- j 1 (step 206), and the continuous low frequency band signals A (1) [K 1] and A (l) [(i + 1) 1] are subbandd in the time direction. Divide and obtain A (2) [K ⁇ 1] in the low frequency band and E [(i + 1) ⁇ 1] in the high frequency band (step 203, 204, 205). This process is repeated until frames other than the first frame are encoded as a high frequency band signal, that is, (l ⁇ j) becomes n (step 207). After that, A (j) [0], E [i] (0 jj ⁇ n) are each divided into sub-bands in the spatial direction and coded (step 208).
- a signal in the high frequency band corresponds to an error signal of motion compensation prediction
- a signal in the low frequency band is an average signal of motion compensated two frames. .
- sub-band synthesis is performed in the time direction according to the reference relationship of the frames after combining the sub-band signals in the space direction for each frame in a manner in which the flow of this processing is reversed.
- a reduced image signal can be obtained by stopping the synthesis halfway without using the high frequency component sub band.
- three-dimensional wavelet coding it is possible to obtain a decoded image on a reduced resolution by subjecting the signals of each frame obtained by partial subband combining to subband combining in the time direction.
- motion compensation at the time of sub-band division in the time direction is performed on a sub-pel basis, and in the case where interpolation processing is used to generate a predicted image.
- This interpolation processing is not compatible with sub-band division. That is, since the signal split into subbands in the time direction and then the signal split into sub-bands in the spatial direction does not match the signal split into sub-bands in the spatial direction and then into sub-bands in the time direction, the decoded image on the reduced resolution is the original The signal degrades significantly compared to the reduced signal.
- FIG. 26 shows a conventional coding process for performing motion compensation in a subband region (Non-Patent Document 2: H.2).
- each frame is divided into subbands (step 301). Thereafter, motion compensation prediction is performed for each sub-band with respect to the frame A [i] (l ⁇ i ⁇ n) and its reference frame A [1] (steps 302, 303, 304, 305).
- the obtained prediction error signal of the frame A [i] (l ⁇ i ⁇ n) and the frame A [0] are subjected to quantization and reversible coding (step 306).
- this process is reversed, and lossless encoding and inverse quantization are performed to obtain the prediction error signal of the frame A [i] (l ⁇ i ⁇ n) and the frame After obtaining the sub-band coefficients of A [0], motion compensation is performed for each sub-band to obtain sub-band coefficients of frame A [i] (l ⁇ i n n). Thereafter, each frame is subjected to subband synthesis to obtain a decoded image. By not using high frequency component sub-bands in this sub-band synthesis processing, a reduced decoded image signal can be obtained.
- Non-Japanese Literature 2 H. Gharavi, "Subband Coding Algorithm for Video Applications: Videophone to HDTV Conferencing, IEEE Trans., CAS for Video Technology, Vol. 1, No. 2, pp. 174-182, June 1991
- Non-Patent Document 3 A. Seeker et. Ai, Motion-compensated highly scalable video compression using an adaptive 3D wavelet transform based on lifting, ⁇ Trans. Int. Conf. Image Proc, p 1029-1032, October, 2001
- Non-Japanese Literature 4 Lio et. Al., "Motion Compensated Lifting Wavelet and Its Application in Video Coding", IEEE Int. Conf. Multimedia & Expo 2001, Aug., 2001
- Non-Patent Document 5 J. M. Shapiro, "Embedded image coding using zerotrees of wavelets coefficients, IEEE Trans, ignal Processing, vol. 41, p. 3445-3462, Dec. 1993"
- the decoded picture obtained by decoding only in the low frequency band of the subband signal is coded in a single layer.
- the image quality is greatly reduced compared to the decoded image in the case of
- the image quality of the decoded image having the same resolution as that of the original image is significantly degraded as compared to the decoded image when encoded in a single layer.
- An object of the present invention is to provide a sub-band having the same image quality as a decoded image in the case where decoded signals in all layers are coded in a single layer in coded data which is hierarchized by subband division.
- a video encoding method and decoding method are provided.
- the moving picture coding method comprises the steps of performing time layer division processing on a moving picture signal of a certain resolution layer to obtain a time stratified signal; The steps of generation processing to obtain a time-hierarchical space high-pass signal, the step of low-pass signal generation processing on spatial hierarchy division on the moving image signal, and obtaining a reduced image signal, and time hierarchy for the reduced image signal And step of obtaining a reduced time stratified signal.
- the moving picture coding method comprises the steps of performing inter-frame prediction processing on a moving picture signal of a certain resolution layer to obtain a prediction error signal, and performing spatial hierarchy division on the prediction error signal.
- High-pass generation processing is performed to obtain a prediction error space high-pass signal
- Low-pass signal generation processing on spatial hierarchy division is applied to the moving picture signal to obtain a reduced image signal
- interframe prediction on the reduced image signal It is characterized in that it comprises a space-time division filtering comprising the steps of processing and obtaining a reduced inter-frame prediction error signal which is a prediction error signal.
- the moving picture coding is performed by performing motion compensation prediction processing on a moving picture signal to be input and repeating three-dimensional sub-band division processing for sub-band division in the spatial direction.
- a method wherein the three-dimensional sub-band division processing is obtained by spatial sub-band division of an input image signal and the input image signal, a motion detection step of detecting an inter-frame motion with respect to the input image signal.
- a motion compensation prediction step for obtaining a prediction error signal by performing motion compensation prediction processing according to the motion information obtained in the motion detection step on an intra band signal which is one band signal of spatial low band sub-bands;
- a prediction error signal space that divides the signal into spatial sub-bands and generates spatial low prediction error subbands and spatial high prediction error subbands
- the intra-band signals by dividing spatial sub-band consists of a band signal space dividing step of generating a spatial low-frequency intra subbands and spatial high frequency intra sub-band, wherein the dynamic
- the motion compensation prediction step, the prediction error signal space division step and the band signal space division step are performed on the image signal, and the spatial low-pass intra subband obtained after the band signal space division step is used as the intra band signal. It is characterized in that the prediction error signal space division step and the band signal space division step are recursively repeated.
- the moving picture coding method is a moving picture coding method in which the input image signal is divided into subbands in the time direction and the three-dimensional subband division process is repeated to divide the input image signal into subbands in the spatial direction.
- the three-dimensional sub-band division processing detects a motion between frames with respect to an input moving image signal, and the moving image signal and the moving image signal are divided into spatial sub-bands.
- One of the spatial lowband subbands obtained as the intraband signal is subjected to motion compensation according to the motion information obtained in the motion detection step, and then temporal subband division is performed to obtain temporal lowband subbands and temporal lowband subbands.
- Temporal high band spatial low band sub-band by temporal sub band dividing step for obtaining high frequency sub band and spatial high band sub band signal by temporal sub band high frequency sub band
- a band signal space dividing step of spatial sub-band dividing the intra band signal into spatial sub-band sub-bands and spatial high-frequency intra sub-bands The motion image signal is subjected to time sub-band division step, time high-frequency sub-band space division step, time low-frequency sub-band space division step, and band signal space division step, and the space low obtained after band signal space division step.
- Sub-band as the intra-band signal and the time sub-band division step and the time high-frequency sub band The de space division step and time lower subband spatial division step and the band signal spatially dividing step and repeating recursively.
- temporal low-pass signals and temporal high-pass signals of a certain resolution layer temporal low-pass spatial high-pass signals and temporal high-pass spatial high-pass signals adjacent to these.
- Spatio-temporal synthesis filtering to reconstruct one step high resolution moving image signal with reference to A step of synthesizing the temporal high-pass spatial low-pass signal with reference to the temporal high-pass signal, the temporal low-pass signal, and the temporal low-pass spatial high-pass signal.
- the moving picture decoding method refers to an intra band signal and a prediction error signal of a certain resolution layer, an intra space high band signal adjacent to these, and a prediction error space high band signal
- the step of synthesizing the spatial low band signal the step of performing spatial layer synthesis processing on the prediction error spatial low band signal and the prediction error spatial high band signal, the intra band signal and the temporal high band spatial high band signal And a step of performing inter-frame prediction decoding processing on these two spatial layer synthesis results.
- the synthesized intraband signal and the prediction error signal are synthesized.
- the spatial low band prediction error subband is synthesized with reference to at least one of an intra band signal in the same frequency band as the error signal and a spatial high band intra sub band which is a spatial high band sub band adjacent to the intra band signal.
- the combined prediction error signal obtained by the prediction error signal synthesis step which comprises the compensation decoding step, is newly regarded as a prediction error signal
- the band signal obtained by the intra band signal space synthesis step is regarded as an intra band signal.
- the area prediction error sub-band synthesis step, the prediction error signal synthesis step, and the intra band signal space synthesis step are recursively repeated.
- the moving picture decoding method receives coded moving picture coded data as an input, combines subband signals in the spatial direction for each frame, and then performs temporal low-pass subband and time.
- a time low frequency sub-band which is in the same frequency band as the time high frequency sub-band and a time low frequency space high-frequency sub which is a sub band of a high frequency band adjacent to the time low frequency sub-band.
- Temporal high-pass spatial low-pass sub-band synthesis step for synthesizing temporal high-pass spatial low-pass sub-bands with reference to at least one of the bands
- Time high band sub-band combining step of combining the time high band sub-band with the time high band spatial high band sub band which is the sub band of the high frequency band adjacent to the low band low band sub-band
- Temporal low-pass sub-band space synthesis step which combines sub-bands and temporal low-pass spatial high-pass sub-bands to generate synthetic temporal low-pass sub-bands, and synthetic temporal low-pass sub-band and synthetic temporal high-pass sub-band Time synthesis step with motion compensation, and the synthesis time high band sub-band obtained by the time high band sub-band synthesis step is newly obtained by the time high band sub-band and the time low band sub-band synthesis step
- the low band sub-band is newly regarded as a time low band sub-band, and the time high band sub-band synthesis step and the time low band sub-band
- a moving image signal 10 of a certain resolution hierarchy is Layering and dividing into time low-pass signal 11 and time high-pass signal 12.
- low-pass generation processing in space layering is performed on the moving image signal 10 to generate a reduced image signal 15.
- Temporal layering is performed on the reduced image signal 15 to obtain a time low-pass signal 16 and a time high-pass signal 17.
- the time low band space high band signal 13, the time high band spatial high band signal 14, the time low band signal 16, and the time high band signal 17 are output as a result of division of the moving picture signal 10.
- the space-time division filtering is recursively performed. Layer the video signal into stages.
- signals to be synthesized are a time low-pass signal 16, a time high-pass signal 17, a time low-pass space high-pass signal 13, and a time high-pass spatial high-pass signal 14.
- temporal hierarchical synthesis processing is performed on the temporal low-pass signal 16 and the temporal high-pass signal 17 to reconstruct a reduced image signal 15.
- spatial hierarchical synthesis processing is performed on the temporal low-pass signal 16 and the temporal low-pass spatial high-pass signal, and the temporal low-pass signal 11 is reconstructed.
- the temporal high-frequency spatial low-pass signal 18 is reconstructed from the reduced image signal 15 and the temporal low-pass signal 11.
- Spatial hierarchical synthesis processing is performed on the temporal high-frequency space low-frequency signal 18 and the temporal high-frequency spatial high-frequency signal 14 to reconstruct the temporal high-frequency signal 12.
- Temporal hierarchy synthesis processing is performed on the time low-pass signal 11 and the time high-pass signal 12 to reconstruct the moving picture signal 10.
- a moving image signal 10 is regarded as a reduced image signal 15, and temporal synthesis filtering is performed recursively to obtain multistage hierarchical synthesis.
- the temporal low-pass spatial low-pass signal 19 is reconstructed from the temporal low-pass signal 16 and the temporal high-pass spatial high-pass signal 14. Also, the temporal high-frequency spatial low-pass signal 18 is reconstructed from the temporal high-frequency signal 17 and the temporal low-pass spatial high-frequency signal 14.
- the spatial low-layer signal processing is performed on the temporal low-pass spatial low-pass signal 19 and the temporal low-pass spatial high-pass signal 13 to reconstruct the temporal low-pass signal 11.
- spatial layer synthesis processing is performed on the temporal high frequency spatial low frequency signal 18 and the temporal low frequency spatial high frequency signal 14 to reconstruct the temporal high frequency signal 12.
- Temporal synthesis processing is performed on the time low-pass signal 11 and the time high-pass signal 12 to reconstruct the moving picture signal 10.
- the temporal low-pass signal 11 is regarded as a temporal low-pass signal 16
- the temporal high-pass signal 12 is regarded as a temporal high-pass signal 17, and multistage hierarchical synthesis is performed by recursively performing space-time synthesis filtering.
- the decoded image on the reduced resolution has an image quality equivalent to that of the conventional subband region-based coding method. Also, the image quality degradation caused by the replacement of the low frequency band component is slight, and the decoded image at the original resolution has the same image quality as the conventional space domain based coding processing method.
- the moving picture coding method and the decoding method according to the present invention can be performed in the case where decoded signals in all layers are coded in a single layer in coded data which is hierarchized by subband division. Achieves the same image quality as the image.
- FIG. 1 is a conceptual diagram for explaining an outline of space-time division filtering in moving picture coding, which is a feature of the present invention.
- FIG. 2 is a spatio-temporal synthesis filter in motion picture decoding, which is a feature of the present invention. It is a conceptual diagram for explaining the outline of the
- FIG. 3 is a conceptual diagram for explaining an outline of the simplified space-time synthesis filtering, which is a feature of the present invention.
- FIG. 4 is a schematic view showing the configuration of a video encoding device and a video decoding device according to an embodiment of the present invention.
- FIG. 5 is a block diagram showing a configuration of a space-time division filtering unit for realizing space-time division filtering in moving picture coding, which is a feature of the present invention.
- FIG. 6 is a flowchart showing the flow of processing of space-time space division filtering
- FIG. 7 is a flow chart showing the flow of processing of a moving picture coding method according to an embodiment of the present invention.
- FIG. 8 is a flow chart showing a flow of space-time sub-band division processing of two frames in FIG.
- FIG. 9 is a conceptual diagram illustrating motion compensation in a low frequency band.
- FIG. 10 is a block diagram showing the configuration of a moving picture coding apparatus according to an embodiment of the present invention.
- FIG. 11 is a block diagram showing a configuration of a space-time division filtering unit.
- FIG. 12 is a block diagram showing the structure of a texture signal encoding unit.
- FIG. 13 is a block diagram showing a configuration of a space-time division filtering unit for realizing space-time synthetic finalization in the moving picture decoding method characterizing the present invention.
- FIG. 14 is a flowchart showing the flow of processing of space-time synthesis filtering.
- FIG. 15 is a conceptual diagram for explaining a process of reconstructing a temporal high-frequency spatial low-pass signal, which is a feature of the temporal-spatial synthesis filtering.
- FIG. 16 is a diagram showing a configuration of a space-time division filtering unit for realizing space-time synthesis filtering according to an embodiment of the present invention.
- FIG. 17 is a flowchart showing the flow of processing of space-time synthesis filtering.
- FIG. 18 is a flow chart showing the flow of processing of a moving picture decoding method according to an embodiment of the present invention.
- FIG. 19 is a flow chart showing the flow of time-space subband synthesis processing of two frames in FIG.
- FIG. 20 is a block diagram showing the configuration of a moving picture decoding apparatus according to an embodiment of the present invention.
- FIG. 21 is a block diagram showing the structure of a texture signal decoding unit.
- FIG. 22 is a block diagram showing the configuration of a space-time synthesis filtering unit.
- FIG. 23 is a block diagram showing the configuration of a time low frequency band signal generation unit.
- FIG. 24 is a block diagram showing a configuration of a time high frequency band signal generation unit.
- FIG. 25 is a flowchart showing the process flow of the first conventional coding method for performing motion compensation in the spatial domain.
- FIG. 26 is a flowchart showing a process flow of a first conventional coding method for performing motion compensation in a subband region.
- a moving picture coding method, a moving picture decoding method, and a moving picture coding apparatus and a moving picture decoding apparatus which realizes the method according to an embodiment of the present invention will be described in detail with reference to the drawings.
- the first video encoding device and the video decoding device include a processor, a storage unit, and an IZ interface, which are used to transmit a bus.
- the storage unit stores one or both of a moving picture coding program and a moving picture decoding program to be executed by the processor, and the processor executes a moving picture coding program or a moving picture decoding program. It also serves as a temporary memory during the line.
- the term "storage unit” refers to any storage device such as a main memory such as a RAM, a cache memory included in a CPU, a register included in a processor, and a hard disk drive. It is used as a thing.
- the I / O interface is an original image to be input to the moving picture coding program according to control of the processor, code code to be output, coded data to be input to the moving picture decoding program, Transmit the decoded image to be output It is an intermediary.
- this I / O interface can be obtained by temporarily storing the original image or encoded data obtained by another program in the storage unit and reading it out from the storage unit. It does not prevent the execution of the method or the moving picture decoding method.
- the processor executes a moving picture coding program and a moving picture decoding program stored in the storage unit.
- the second moving picture coding apparatus and the moving picture decoding apparatus according to the embodiment of the present invention are constituted by an operation subject that realizes operation steps in the moving picture coding method and the moving picture decoding method, The relationship is also associated with the signals referenced and generated by the video coding method and the video decoding method. In the following, in order to clarify the explanation, it will be described focusing on only the operation without referring to the operation subject one by one.
- the space-time division filtering unit comprises a space low-pass signal generation unit 51, a space high-frequency signal generation unit 53, 54, and a time direction filtering unit 52.
- the moving image signal 10 and the reduced image signal 15 in FIG. 1 correspond to the moving image signal 10 and the reduced image signal 15 in FIG.
- the time low band signals 11 and 16 in FIG. 1 correspond to the time low band signal 21 in FIG. 5
- the time low band signals 12 and 17 in FIG. 1 correspond to the time low band signal 22 in FIG.
- the temporal low-pass spatial high-pass signal 13 and the temporal high-pass spatial high-pass signal 14 in FIG. 1 correspond to the temporal low-pass spatial high-pass signal 23 and the temporal high-pass spatial high-pass signal 24 in FIG.
- the moving image signal 10 is temporally layered by temporal direction filtering 52 to generate temporal low-pass signal 21 and temporal high-pass signal 22 (step 80).
- Time low band signal 21 is space high
- the high frequency signal 22 is subjected to high frequency signal generation processing by spatial layering by the spatial high frequency signal generator 54 by the low frequency signal generator 53, and the low time spatial high frequency signal 23 and time A high-pass spatial high-pass signal 24 is generated (step 81).
- the temporal low-pass spatial high-pass signal 23 and the temporal high-pass spatial high-pass signal 24 are output as divided result signals 25 and 26.
- the low-pass signal generation processing by spatial hierarchization is performed on the moving picture signal 10 by the spatial low-pass signal generation unit, and a reduced image signal 15 is generated (step 82).
- the time direction filtering unit 52 performs time layering on the reduced image signal 15 to generate a time low band signal 21 and a time high band signal 22 (step 83).
- the time low-pass signal 21 and the time high-pass signal 22 are output as divided result signals 25 and 26, respectively.
- FIG. 7 a moving picture coding method having space-time division filtering will be described using FIGS. 7 and 8.
- FIG. 7 a moving picture coding method having space-time division filtering will be described using FIGS. 7 and 8.
- FIG. 7 is a flowchart showing the flow of encoding processing according to an embodiment of the present invention.
- a coding method in which a set of continuous image frames A (0) [i] (0, i ⁇ n, n is a power of 2) is used as an original image input will be described with reference to FIG.
- FIG. 8 is a flow chart showing the flow of processing of time-space direction sub-band division of two frames in step 103 of FIG.
- the motion of frame B0 relative to frame CO is estimated (step 111).
- the movement means translation of each block of fixed size or variable size constituting a frame, or geometric transformation such as affine transformation to each small area constituting a frame, or geometric transformation such as affine transformation to an entire frame Represents
- step 112 based on the motion information obtained in step 111, BO and CO are divided into subbands in the time direction to obtain a low frequency band subband A0 * and a high frequency band subband E0 * (step 112).
- time direction sub-band division methods reference [Non-patent document 3: A. Seeker et. Al, "Motion-compensated highly scalable video compression using an adaptive 3D wavelet transform based on lifting", IEEE Trans. Int. Conf. Image Proc, pp
- Non-Patent Document 4 L. Lio et. Al
- C0i be BO'i 'CO'i after multiplication by the first order filter by the constant ⁇
- A0 * and E0 * are divided into spatial subbands once (step 113).
- Each subband transform is defined as LL (), LH (), HL (), HH ().
- H (C0) as a set of three sub-ends LH (C0), HL (CO) and HH (CO). This gives LL (A0 *), H (A0 *), LL (E0 *), H (E0 *)
- B1 and C1 are sub-band-divided in the time direction based on the motion information obtained in step 111 to obtain a low frequency band sub-band Al * and a high frequency band sub-band El * (step 116).
- A1 * becomes equal to LL (A0 *)
- E1 * is not equal to LL (E0 *).
- the motion compensation process in the low frequency band sub-band in the spatial direction in this embodiment will be described with reference to FIG.
- the filters WBLL0, WBLH0, WBHL0, and WBHH0 obtained by multiplying these filters by WB0 of Equation (1) are
- WBLLO (Bl) + WBLH0 (LH (B0)) + WBHL0 (HL (B0)) + WBHH0 (HH (B0)) WB0 (B0) (3)
- WBl (Bl) + WBH0 (H (B0)) LL (WB0 (B0)) (4)
- Ak * and Ek * are defined according to equations (7) to (12) as in equations (1) to (6).
- Another method of applying the motion information obtained at the original resolution to the low frequency band sub-band in the spatial direction is to reduce the motion information according to the resolution.
- H * is substituted for Al * and H (A0 *) instead of LL (A0 *).
- B0 and LL (E0 *)
- Al * and El * are divided once into spatial subbands to obtain L (A1 *), H (A1 *), L (E1 *) and H (E1 *) (step 118).
- Bl and C1 are sub-band divided once (step 115), and the obtained B2 and C2 are sub-band divided in the time direction (step 116).
- the above processing is performed until the number of divisions reaches m (step 117), and the obtained L (Am *), H (Bk), L (Em *), H (Ek *) (0 ⁇ k ⁇ m) ) As the division result (step 119), and the processing ends.
- step 103 This completes the description of step 103. Referring back to FIG. 7, the description of the encoding process of the present invention will be continued.
- a (0) * [0] which is a low frequency band sub-band in the time direction, is sub-band synthesized only in the space direction to generate A (1) [0] (step 105). This is to divide A (1) [0] into sub-bands in the space-time direction in step 103 again in the time direction hierarchy one step up. It is
- the encoding process performs quantization and lossless encoding on the obtained signals A (j) * [0], E * [i] (0 ⁇ i ⁇ n) (step 109).
- quantization in addition to linear quantization, nonlinear quantization, and vector quantization, bit-plane quantization used in JPEG2000 which is a still image code of international standard is used.
- lossless coding reference 3 [Non-patent document 5: M. Shapiro, Embedded image coding using zerotrees oiwavelets coefficients, IEEE Trans, ignal Processing, vol. 41, p. 3445-3462, Dec. 1993].
- Zero tree coding, arithmetic coding, and run length coding are used. This is the end of the coding process of A (0) [k] (0 ⁇ k ⁇ n).
- a process is performed in which a frame to be encoded in the next hierarchy is temporarily subjected to subband synthesis in the spatial direction.
- these two processes can be integrated by performing processing such as correcting the high frequency component of the sub-band signal as needed in the spatial direction by motion compensation.
- FIG. 10 is a block diagram showing the configuration of a moving picture coding device.
- the input image signal 2000 is frequency-divided in the time-space direction by the time-space division filtering unit 200 to generate a time low-frequency division signal 2001 and a time high-frequency division signal 2002.
- the temporal low-pass segmented signal 2001 and the temporal high-pass segmented signal 2002 are each encoded by the texture signal encoding unit 201, and encoded data 2003 is generated.
- FIG. 11 is a block diagram showing the configuration of the space-time division filtering unit. Initially, input image signal 2000 is stored in memory 218.
- a time direction filtering unit 211 performs time layering on the input image signal 2000 to generate a time low band signal 2012 and a time high band signal 2013.
- the spatial sub-band division unit 212 performs high-pass signal generation processing on the temporal low-pass signal 2012 to generate a temporal low-pass spatial high-pass signal 2014.
- spatial sub-band division section 213 performs high-pass signal generation processing on temporal low-pass signal 2013 to generate temporal low-pass spatial high-pass signal 2015.
- the temporal high-frequency spatial high-frequency signal 2015 is output as a temporal high-frequency divided signal 2002, and the temporal low-frequency spatial high-frequency signal 2014 is stored in the memory 219.
- the input image signal stored in the memory 218 is subjected to low-pass signal generation processing by the spatial sub-band division unit 210, and a reduced image signal 2010 is generated.
- the temporal direction filtering unit 211 With respect to the reduced image signal 2010, the temporal direction filtering unit 211 generates a temporal low-pass signal 2012 and a temporal high-pass signal 2013 by time layering.
- Spatial sub-band division sections 212 and 213 perform high-pass signal generation processing on time low-pass signal 2012 and time high-pass signal 2013, respectively, and time low-pass spatial high-pass signal 2014 and time high-pass spatial high-pass signal 2015 Generate
- the temporal high-frequency spatial high-frequency signal 2013 is output as a temporal high-frequency divided signal 2002, and the temporal low-frequency spatial high-frequency signal 2014 is stored in the memory 219.
- switches 214 and 215 perform time low band signal 2012 and time high band signal 2013 as time low band divided signal 2001 at the mth division. And it is considered as a time high frequency division signal 2002.
- the temporal low-pass divided signal stored in the memory 219 is synthesized by the spatial synthesis filtering unit 217 to generate a temporal low-pass signal 2017.
- the space-time division filtering unit recursively performs the above-mentioned space-time division filtering considering the time low-pass signal 2017 as an input.
- the switch 216 outputs the time low-frequency divided signal 216 without storing it in the memory 219 after the ⁇ -th division.
- FIG. 12 is a block diagram showing the configuration of the texture signal encoding unit.
- the time low-frequency division signal 2001 and the time high-frequency division signal 2002 are integrated and referred to as a division result signal 2021.
- the division result signal 2021 is quantized by the quantization unit 221 and output as a quantization coefficient signal 2022.
- the quantization coefficient signal 2022 is entropy-coded by the entropy coding unit 222 and output as coded data 2003.
- the quantization unit 221 may be omitted.
- frequency conversion processing may be added before the quantization unit 221.
- step 105 in FIG. 7 corresponds to the processing of the spatial synthesis filtering unit 217 in FIG. 1
- step 103 in FIG. 7 corresponds to the spatial synthesis filtering unit 217 in the space-time division filtering unit shown in FIG. It corresponds to the processing except.
- Steps 104 and 107 in FIG. 7 correspond to the processing of the switch 216 in FIG. 1
- step 109 in FIG. 7 corresponds to the processing of the texture signal code unit 201 in FIG.
- steps 111, 112 and 116 in FIG. 8 correspond to the process of temporal direction filtering 211 in FIG. 1, and step 115 in FIG. 8 corresponds to the spatial sub-band dividing unit 210 in FIG. And 118 correspond to the processing of the spatial sub-band division units 212 and 213 in FIG. Step 117 in FIG. 8 corresponds to the processing of the switches 214 and 215 in FIG.
- the spatio-temporal synthesis filtering unit includes a spatial synthesis filtering unit 55, a temporal direction inverse filtering unit 56, a temporal high-frequency spatial low-pass signal reconstruction unit 57, a spatial synthesis filtering unit 58, a temporal direction inverse filtering.
- Part 59 consists of:
- the moving picture signal 10 time low band signal 11, time high band signal 12, time low band space high band signal 13, time high band space high band signal 14, reduced image signal 15, time low band
- the signal 16, the time high band signal 17 and the time high band space low band signal 18 are respectively the moving picture signal 10, the time low band signal 11, the time high band signal 12 and the time low band spatial high band signal 13 in FIG. It corresponds to the temporal high frequency spatial high frequency signal 14, the reduced image signal 15, the temporal low frequency signal 16, the temporal high frequency signal 17, and the temporal high frequency spatial low frequency signal 18.
- the spatial synthesis filtering unit 55 performs spatial hierarchical synthesis processing on the temporal low-pass signal 16 and the temporal low-pass spatial high-pass signal 13 to generate a temporal low-pass signal 11 (step 84). Further, the time direction inverse filtering unit 56 performs time layer synthesis processing on the time low-pass signal 16 and the time high-pass signal 17 to reconstruct the reduced image signal 15 (step 85). Time high band sky The inter-low-frequency signal reconstruction unit 57 reconstructs the temporal high-frequency spatial low-pass signal 18 with reference to the temporal low-pass signal 11 and the reduced image signal 15 (step 86).
- the spatial synthesis filtering unit 58 performs spatial layer synthesis processing on the temporal high-frequency spatial low-frequency signal 18 and the temporal high-frequency spatial high-frequency signal 14 (step 87), and reconstructs the temporal high-frequency signal 12.
- the temporal direction inverse filtering unit 59 performs temporal hierarchical synthesis processing on the temporal low-pass signal 11 and the temporal high-pass signal 12 to reconstruct the moving picture signal 10 (step 88).
- a feature of the spatio-temporal synthesis filtering is a process of reconstructing a temporal high-frequency spatial low-pass signal.
- FIG. 15 is a conceptual diagram for explaining the process. Symbols representing signals in FIG. 15 are the same as the symbols in FIG. BO and B1 indicate time low band signals 11 and 16 in FIG. 14, E0 * and El * indicate time high band signals 12 and 17, and H (E0 *) indicates time high band spatial high band signal 14. . Further, CO represents a moving image signal 10 corresponding to E0 *, and C1 represents a reduced image signal 15 corresponding to E1 *.
- WB0 and WB1 are motion compensation elements for B0 and B1, respectively.
- the spatio-temporal synthesis filtering in the moving picture decoding method according to an embodiment of the present invention is shown in FIG.
- the space-time synthesis filtering unit is a time low-pass space low-pass signal reconstruction unit 60, a time high-pass spatial low-pass signal reconstruction unit 61, a space synthesis filtering unit 62, and a spatial synthesis filtering.
- Part 63 consists of time direction inverse filtering 54.
- moving image signal 10 time low band signal 11, time high band signal 12, time low band space high band signal 13, time high band
- the spatial high-pass signal 14, the reduced image signal 15, the temporal low-pass signal 16, the temporal high-pass signal 17, the temporal high-pass spatial low-pass signal 18 and the temporal low-pass spatial low-pass signal 19 are the moving picture signals in FIG.
- time low band signal 11 time high band signal 12, time low band space high band signal 13, time high band space high band signal 14, reduced image signal 15, time low band signal 16, time high band signal 17, It corresponds to the time high band space low band signal 18 and the time low band space low band signal 19.
- temporal low-pass spatial low-pass signal reconstruction section 60 reconstructs temporal low-pass spatial low-pass signal 19 with reference to temporal low-pass signal 16 and temporal high-pass spatial high-pass signal 14 (step 89 ).
- the temporal high-frequency space low-frequency signal reconstruction unit 61 reconstructs the temporal high-frequency spatial high-frequency signal 18 by referring to the temporal high-frequency signal 17 and the temporal low-frequency spatial high-frequency signal (step 90).
- the spatial synthesis filtering unit 62 spatially hierarchically combines the temporal low-pass spatial low-pass signal 19 and the temporal low-pass spatial high-pass signal 13 to reconstruct the temporal low-pass signal 11 (step 91).
- the part 63 spatially hierarchically combines the time low space spatial low band signal 18 and the time low band spatial high band signal 14 to reconstruct the time low band signal 12 (step 92).
- the temporal direction inverse filtering unit 64 performs temporal hierarchical synthesis processing on the temporal low-pass signal 11 and the temporal high-pass signal 12 to reconstruct the moving picture signal 10 (step 93).
- FIG. 18 is a flowchart showing a flow of decoding processing according to an embodiment of the present invention.
- a process of reconstructing A (j0) k0 [i] will be described.
- inverse transformation and inverse quantization of lossless encoding are performed on encoded data (step 152).
- the signals obtained after this processing are defined as A (n0) * [0], E * [i] (0 ⁇ i * n) according to the symbols used in FIG.
- it is determined whether jO is equal to ⁇ (step 153).
- jO is equal to ⁇ , it is not necessary to perform subband synthesis in the time direction.
- a (j) * [0] is subband synthesized in the spatial direction by k 0 layers.
- a (j0) k0 [0] is reconstructed (step 154), the decoding process ends.
- jO is not equal to ⁇
- a (j) * [0] and E * [n / 2] are subband synthesized in both the time direction and the space direction (steps 155 and 156).
- FIG. 19 is a flowchart showing the flow of the process of combining two frame data in the space-time direction sub-band in step 156.
- k0 be the subband combining number at the time of decoding. If k0 is zero, it is a decoded image at the same resolution as the original image, and if k0 is positive, a decoded image of a resolution reduced by the power of 2 k0 is obtained.
- the data of the two frames to be subjected to subband composition processing has a hierarchical structure divided into m subbands in the spatial direction. According to step 116 and step 118 in FIG.
- the subband signals belonging to the low frequency band in the time domain subband division are Am *
- the high frequency band sub-band after the k-th sub-band division corresponds to H (Bk) (0 ⁇ k ⁇ m).
- the signals after being divided in the spatial direction of the subband signals belonging to the high frequency band by the subband division in the time direction can be mapped to Em * and H (Ek *), (0 ⁇ k ⁇ m).
- step 171 and 172 Bm and Cm are obtained by combining Am * and Em * in the time direction (step 177).
- Subband synthesis is performed when the time-domain subband splitting shown in equations (7) and (8) is performed.
- WBm and WCm are a filter representing motion compensation from Bm to Cm and a filter representing motion compensation from Cm to Bm, which are the same as in the coding process.
- L (Ak_l *) and H (Ak-l *) are subjected to subband synthesis, and L (Ek_l *) and H (Ek_l *) are subjected to subband synthesis to obtain Ak-1 * and Ek_l *.
- Obtain (step 175).
- Steps 173 to 175 are repeated to obtain subbands Ak0 * and EkO * corresponding to hierarchy k0 (steps 176 and 172), and time-wise subband synthesis is performed to obtain BkO and CkO (step 177) . This concludes the description of the spatio-temporal subband synthesis in step 156 of FIG.
- step 173 and 174 have been described as independent steps. It is also possible to integrate these steps by using a filter that is multiplied by a band synthesis filter.
- the description of the decoding process is continued.
- the image is an image of l / 2k0 of the original image A (j) (k0) [0] and A (j) (k0) ) [n / 2] is obtained.
- j0 is equal to nO-1 (step 157)
- the decoding process ends here. Otherwise, they are divided into subbands in the k0 space direction to obtain A (j-1) * (k0) [0] and A (j-1) * (k0) [n / 2].
- Space-time subband synthesis in the next layer by decreasing j by 1 is A (j) * [0] and E * [n / 4], and A (j) * [n / 2] And E * [3n / 4] (steps 156, 159, 160).
- Subband synthesis is repeated as described above, and the decoding process is ended when j becomes equal to j0 (step 161).
- FIG. 20 is a block diagram showing the configuration of a moving picture decoding apparatus.
- the moving picture decoding apparatus includes a texture signal decoding unit 301, a switch 302, a space-time synthesis filtering unit 303, a space synthesis filtering unit 304, and a switch 305.
- the coded data 3000 becomes a division result signal 3001 by the texture signal decoding unit 301.
- the result of the space layer synthesis processing of the switch 305 division result signal 3001 by the spatial synthesis filtering unit 304 is output as a decoded image, or as the time low band divided signal 3002 or the time high band divided signal 3003 by the switch 302
- the result of the spatio-temporal synthesis filtering performed by the spatio-temporal synthesis filtering unit 303 is output as a decoded image 3004.
- FIG. 21 is a block diagram showing a configuration of the texture signal decoding unit.
- the encoded data 3000 is decoded by the entropy decoding unit 306 and output as the quantization coefficient signal 3006.
- the inverse quantization unit 307 inversely quantizes the quantization coefficient signal 3007 to reconstruct the division result signal 3001. Note that the inverse quantization unit 307 may be omitted corresponding to the process at the time of encoding. Also, frequency inverse transform processing may be added after the inverse quantization unit 307.
- FIG. 22 is a block diagram showing a configuration of the space-time synthesis filtering unit.
- Temporal low-pass split signal 3002 is a signal obtained by multiplexing temporal low-pass signal 3010 and temporal low-pass spatial high-pass signal 3011
- temporal high-pass split signal 3003 is temporal high-pass signal 3012 and temporal high-pass spatial high-pass signal 3013. Are multiplexed signals.
- Subband demultiplexing section 310 demultiplexes temporal low-pass division signal 3002 and outputs temporal low-pass signal 3010 and temporal low-pass spatial high-pass signal 3011 to temporal low-pass signal generation section 312 as needed.
- the sub-band demultiplexing unit 311 demultiplexes the temporal high-frequency division signal 3003 and outputs the temporal high-frequency signal 3012 and the temporal high-frequency spatial high-frequency signal 3013 to the temporal high-frequency signal generation unit 313 as needed.
- FIG. 23 is a block diagram showing a configuration of a time low-pass signal generation unit.
- the temporal low-pass spatial low-pass signal reconstruction unit 320 reconstructs the temporal low-pass spatial low-pass signal 3030 with reference to the auxiliary signal 3015 output from the temporal high-pass signal generator and the temporal low pass signal 3010.
- the spatial synthesis filtering unit 321 performs spatial hierarchy synthesis processing on the temporal low-pass spatial signal 3030 and the temporal low-pass spatial high-pass signal 3011 to generate a temporal low-pass signal 3031.
- Switch 322 is a time low band signal As a power to output 3031 as it is as an input to the temporal high-frequency space low-pass signal reconstruction unit 320, the time low-pass signal generation processing is performed recursively.
- the time low-pass space high-pass signal 3011 is output as an auxiliary signal 3014 to the time high-pass signal generator 313.
- FIG. 24 is a block diagram showing a configuration of a temporal high frequency band signal generation unit.
- the temporal high-frequency space low-frequency signal reconstruction unit 323 reconstructs the temporal high-frequency spatial low-frequency signal 3032 with reference to the auxiliary signal 3014 output from the temporal high-frequency signal generation unit and the temporal high frequency signal 3012.
- the spatial synthesis filtering unit 324 performs spatial layer synthesis processing on the temporal high-frequency spatial signal 3032 and the temporal high-frequency spatial high-frequency signal 3013 to generate a temporal high-frequency signal 3033.
- the switch 325 outputs the temporal high-frequency signal 3033 as it is, or performs temporal high-frequency signal generation processing as input to the temporal high-frequency spatial low-frequency signal reconstruction unit 323 again.
- the time low-pass space high-pass signal 3013 is output as an auxiliary signal 3015 to the time high-pass signal generator 312.
- the switch 314 outputs the time low band signal 3010 or the time low band signal 3016 output from the time low band signal generator 312 to the time direction inverse filtering 316.
- the switch 315 outputs the time high frequency signal 3012 or the time high frequency signal 3017 output from the time high frequency signal generator 313 to the time direction inverse filtering 316.
- Temporal subband synthesizing section 316 performs temporal layer synthesizing processing on temporal low-frequency signal 3018 and temporal high-frequency signal 3019 output from switches 314 and 315 to reconstruct moving image signal 3020.
- the switch 317 outputs the moving picture signal 3020 to the space division filtering unit 318 when it is necessary to combine the moving picture signal 3020 in the time direction. Also, if the synthesis in the spatial direction has been completed a predetermined number of times, it is output as a moving image signal 3004.
- the space division filtering unit 318 performs space hierarchical division processing on the input moving image signal in order to generate a low-frequency divided signal 3002 from the input moving image signal and recursively perform space-time synthesis filtering.
- the divided result signal 3021 is output to the subband demultiplexing unit 310.
- the processing in texture signal decoding section 301 in FIG. 20 corresponds to that in step 152 in FIG. It corresponds.
- the processing in the spatio-temporal synthesis filtering unit 303 in FIG. 20 corresponds to steps 156 and 158 in FIG.
- the determination processes in the switches 302 and 305 in FIG. 20 correspond to steps 153 and 161 in FIG. 18, respectively.
- the spatial synthesis filtering unit 304 corresponds to step 154.
- the processing of the temporal low-pass spatial low-pass signal reconstructing unit 320 in FIG. 23 and the temporal high-pass spatial low-pass signal reconstructing unit 323 in FIG. corresponds to step 173 in FIG.
- the processing of the spatial synthesis filtering unit 321 in FIG. 23 and the processing of the spatial synthesis filtering unit 324 in FIG. 24 correspond to step 175 in FIG.
- the determination process of the switch 322 in FIG. 23 and the switch 325 in FIG. 24 corresponds to step 172 in FIG.
- the process in the time subband combining unit 316 in FIG. 22 corresponds to step 177 in FIG.
- the determination process of the switch 317 in FIG. 22 corresponds to step 160 in FIG. 18, and the process in the space division filtering unit 318 corresponds to step 158.
- the temporal low-pass spatial low-pass signal is reconstructed with reference to the temporal low-pass signal and the temporal high-pass spatial high-pass signal.
- the temporal high frequency spatial low frequency signal is reconstructed with reference to the low spatial frequency high frequency signal.
- the spatio-temporal synthesis filtering there is a method of simultaneously reconfiguring the temporal low-pass spatial low-pass signal and the temporal high-pass spatial low-pass signal by referring to only the temporal low-pass signal and the temporal high-pass signal. is there.
- the motion compensation process in the upper layer is performed based on the motion information obtained by reducing the motion information obtained at the original resolution according to the resolution.
- the present invention is also applicable to the case where the reference relationship has an arbitrary structure.
- the embodiment has been described by limiting to a case in which a frame in the past is converted to a low frequency band sub-band in one time direction sub-band division
- the present invention is also applicable to the case of converting into sub-bands, or the case of performing division in the time direction by bi-directionally predicting two frames.
- the low frequency band sub-band when dividing each sub-band after being divided in the time direction into the space direction is divided into the encoding target image in the space direction.
- the divided low frequency band sub-bands are replaced with sub-bands divided in the time direction, and correction is performed so as to obtain a desired decoding result using decoding results or sub-bands of a frame serving as a pair at the time of decoding.
- sub-band division is used as a transformation method for realizing hierarchical coding in the present embodiment
- the present invention is applicable to any hierarchical coding method.
- signals corresponding to low frequency bands are associated with the upper layer.
- the upper layer signal of the prediction error signal obtained after the interframe prediction processing is divided into the upper layer signal after the input image signal is divided into upper layers. Replace the signal with the prediction error obtained by performing inter-frame prediction processing.
- the upper layer of the hierarchical frame signals is corrected to the upper layer signal of the hierarchical division of the prediction error signal obtained by performing inter-frame prediction processing on the input image signal.
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EP04747293.1A EP1655972A4 (en) | 2003-07-09 | 2004-07-09 | ANIMATED IMAGE ENCODING METHOD, ANIMATED IMAGE DECODING METHOD, ANIMATED IMAGE ENCODING DEVICE, ANIMATED IMAGE DECODING DEVICE, AND ASSOCIATED SOFTWARE |
US10/563,618 US8306113B2 (en) | 2003-07-09 | 2004-07-09 | Moving picture encoding method, moving picture decoding method, moving picture encoding device, moving picture decoding device, and computer program |
US13/664,593 US8855198B2 (en) | 2003-07-09 | 2012-10-31 | Moving picture encoding method, moving picture decoding method, moving picture encoding device, moving picture decoding device, and computer program |
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JP5640370B2 (ja) * | 2009-12-18 | 2014-12-17 | ソニー株式会社 | 画像処理装置,画像処理方法及び撮像装置 |
TWI595770B (zh) * | 2011-09-29 | 2017-08-11 | 杜比實驗室特許公司 | 具有對稱圖像解析度與品質之圖框相容全解析度立體三維視訊傳達技術 |
WO2013173292A1 (en) * | 2012-05-14 | 2013-11-21 | Motorola Mobility Llc | Scalable video coding with enhanced base layer |
US9032106B2 (en) | 2013-05-29 | 2015-05-12 | Microsoft Technology Licensing, Llc | Synchronizing device association data among computing devices |
US10778890B1 (en) * | 2019-09-30 | 2020-09-15 | Amazon Technologies, Inc. | Video denoising systems and methods |
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EP1655972A4 (en) | 2013-12-04 |
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