WO2011065728A2 - 예측을 위한 컬러 플레인간의 상관 파라미터 추출 장치와 방법 및 이를 위한 기록 매체 - Google Patents
예측을 위한 컬러 플레인간의 상관 파라미터 추출 장치와 방법 및 이를 위한 기록 매체 Download PDFInfo
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- WO2011065728A2 WO2011065728A2 PCT/KR2010/008298 KR2010008298W WO2011065728A2 WO 2011065728 A2 WO2011065728 A2 WO 2011065728A2 KR 2010008298 W KR2010008298 W KR 2010008298W WO 2011065728 A2 WO2011065728 A2 WO 2011065728A2
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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
- H04N19/186—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 colour or a chrominance component
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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
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/593—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial prediction techniques
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- An embodiment of the present invention relates to an image data compression technique. More specifically, in video encoding, an optimal correlation parameter between color planes is generated by using neighboring blocks when a prediction screen is created by using a correlation between color planes. An apparatus and method for extracting correlation parameters between color planes for prediction, and a recording medium therefor.
- RGB format In general, all color video inputs and outputs are now in RGB format. That is, R (red), G (green), and B (blue) can express all colors.
- the RGB format has a high correlation between each color channel, which causes a problem of low compression ratio when video is encoded in the RGB format.
- current commercial applications use video format in YCbCr format, not RGB format, for video storage, transmission, and compression.
- methods for converting RGB to YCbCr are defined in international standards groups such as ITU and SMPTE.
- YCbCr Y is a luminance component
- Cb and Cr are chrominance components
- the correlation between each color channel is considerably removed.
- H.264 / AVC AMD supports signal processing in the RGB region with High 4: 4: 4 Intra / Predictive profiles.
- the following two methods are supported. First, a common mode scheme in which an intra / inter mode determined at the time of encoding a green chrominance signal is also applied to blue and red when processing an RGB signal. And second, an independent mode of processing each RGB separately.
- an intra / inter mode determined at the time of encoding a green chrominance signal is also applied to blue and red when processing an RGB signal.
- an independent mode of processing each RGB separately.
- the decoder increases the coding efficiency by removing the additional information for informing the correlation between channels by estimating the slope and the offset based on the sample values of the left and upper regions of the image.
- the coding gain was obtained by using the encoded green signal to generate a prediction screen for encoding blue and red.
- An embodiment of the present invention is to solve the above-described conventional problem, and its purpose is to extract the optimal correlation parameter between color planes by using a specific block having the highest similarity with the current block among neighboring blocks to perform optimal prediction.
- an apparatus for extracting correlation parameters between color planes for prediction may be configured such that a second block of a reconstructed previous plane corresponding to a first block to be encoded of a current plane may be generated.
- Peripheral block search unit for searching for the third block having the smallest difference in pixel value from the second block among the neighboring blocks of the two blocks.
- the apparatus may include a correlation parameter calculator configured to calculate a correlation parameter between the third block and the fourth block, and a predictor configured to predict the first block based on the second block and the calculated correlation parameter.
- the neighboring block search unit may search for the third block according to a sum of absolute difference (SAD) scheme, and the correlation parameter calculator may perform an MSE between the third block and the fourth block according to a mean square error (MSE) scheme.
- the parameter that minimizes the value may be calculated as the correlation parameter.
- a correlation parameter extraction method between color planes for prediction including: searching for a second block of a reconstructed previous plane corresponding to a first block to be encoded of the current plane; Searching for the third block having the smallest difference in pixel value from the second block among the neighboring blocks of the second block; searching for the third block and the restored fourth block of the current plane corresponding to the third block.
- the method may include calculating a correlation parameter between the third block and the fourth block, and predicting the first block based on the second block and the calculated correlation parameter.
- the third block may be searched according to a Sum of Absolute Difference (SAD) scheme, and the correlation parameter may be configured to minimize an MSE value between the third block and the fourth block according to a mean square error (MSE) scheme. Can be calculated as a parameter.
- SAD Sum of Absolute Difference
- MSE mean square error
- a computer-readable recording medium in which a method of extracting correlation parameters between color planes for the prediction can be provided.
- an optimal correlation parameter between color planes is extracted by using a specific block having the highest similarity with the current block among neighboring blocks, and an optimal prediction for the current block is performed based on the optimal correlation parameter.
- an optimal prediction picture is generated by selecting an optimal block that is most similar to the current block among neighboring blocks, thereby improving compression ratio and improving image quality. Since the degradation is reduced, and the optimal block is found through the simple search using the SAD and the color difference prediction is performed, more efficient intra prediction can be performed without adding additional information.
- 5 is a schematic diagram of an encoder including interplane prediction
- FIG. 7 is a schematic diagram of a decoder including interplane prediction
- FIG. 8 is a block diagram of an apparatus for extracting correlation parameters between color planes for prediction according to an embodiment of the present invention.
- FIG. 9 is a flowchart of a method for extracting correlation parameters between color planes for prediction according to an embodiment of the present invention.
- FIG. 10 is a view showing a relationship between a current plane and a restored plane according to an embodiment of the present invention.
- FIG. 11 illustrates a search direction and an area according to an embodiment of the present invention.
- FIG. 4 is a block diagram schematically illustrating an apparatus for encoding a base plane, wherein the apparatus for encoding a base plane (also called a reconstructed previous plane) includes an intra predictor 410, a converter 420, and a quantizer 430. , An entropy encoder 440, and the like, and are encoded independently of other planes. After generating a base plane using the base plane encoder of FIG. 4, planes other than the base plane are coded using the encoder including the interplane prediction of FIG. 5 using the base plane encoder.
- FIG. 5 is a block diagram schematically illustrating an encoder including interplane prediction, and includes an intra predictor 510, an interplane predictor 520, a transformer 530, a quantizer 540, an entropy encoder 550, and the like.
- the interplane predictor 520 includes an apparatus for extracting correlation parameters between color planes for prediction proposed in the present invention, and receives neighboring blocks and a base plane as inputs.
- the encoder performs intra prediction and interplane prediction, and then performs the prediction of the current block using an appropriate prediction method. Which one of intra prediction and inter plane prediction is used is signaled and transmitted.
- the residual signal which is the difference between the predicted signal and the original signal, is then transformed, quantized, and entropy coded by the transformer 530, quantizer 540, and entropy encoder 550 to produce the final output stream.
- Decoding may restore the image to the inverse of the above-described encoder.
- FIG. 6 schematically illustrates a decoder of a basic plane, which may include an entropy decoder 610, an inverse quantizer 620, an inverse transformer 630, an intra predictor 640, and the like. Decoded independently regardless. After the basic plane is generated using the basic plane decoder of FIG. 6, planes other than the basic plane are decoded using a decoder including the interplane prediction of FIG. 7 using the basic plane decoder.
- FIG. 7 is a diagram schematically illustrating a decoder including interplane prediction, and includes an entropy decoder 710, an inverse quantizer 720, an inverse transformer 730, an intra predictor 740, an interplane predictor 750, and the like. It can be configured to include.
- the interplane predictor 750 includes an apparatus for extracting correlation parameters between color planes for prediction proposed in the present invention, and receives neighboring blocks and a basic plane as inputs.
- the decoder performs prediction by the prediction method signaled in the input stream during intra prediction and interplane prediction. Thereafter, the predicted image and the decoded residual image are added to generate a final decoded image.
- FIG. 8 is a block diagram of an apparatus for extracting correlation parameters between color planes for prediction according to an embodiment of the present invention. As shown in the figure, a neighboring block search unit 810, a correlation parameter calculation unit 830, and The prediction unit 850 is included.
- the neighboring block search unit 810 may restore the previous plane (or the base) corresponding to the first block (eg, the Y block of FIG. 10) to be encoded of the current plane (eg, see FIG. 10B).
- the second block referred to as plane (A) in FIG. 6, for example, X block in FIG. 10
- the second block among the neighboring blocks of the second block X After searching for the third block (eg, the X ′ block of FIG. 10) having the smallest difference in pixel value of, the restored fourth block of the current plane corresponding to the third block (X ′) (eg, Y 'block of FIG. 10).
- the neighboring block of the second block X is illustrated as a block hatched in FIGS. 11A, 11B, and 11C, and a coding unit is 16 ⁇ 16 units as shown in FIG.
- a coding unit is 16 ⁇ 16 units as shown in FIG.
- a plurality of 4X4 blocks adjacent to the left, top, and right upper ends of the corresponding 16X16 block may be set as neighboring blocks, and as shown in FIG.
- Five 4X4 blocks adjacent to the left and the top may be set as neighboring blocks, and three 4X4 blocks adjacent to the left, upper left and top of the 4X4 block corresponding to the case where the coding unit is a 4X4 unit block as shown in FIG. 11 (C).
- the neighboring block search unit 810 may sequentially search the neighboring blocks set as shown in FIG. 11 based on a Sum of Absolute Difference (SAD) method, for example, in a lower left-> upper-left-> right upper direction.
- SAD Sum of Absolute Difference
- the third block X 'having the smallest value can be found.
- the correlation parameter calculator 830 calculates a correlation parameter between the third block X 'and the fourth block Y' based on the third block X 'and the fourth block Y' corresponding thereto. For example, a parameter for minimizing an MSE value between the third block X 'and the fourth block Y' according to a mean square error (MSE) method may be calculated as a correlation parameter.
- MSE mean square error
- the prediction unit 850 may generate the prediction block of the first block Y based on the correlation parameter calculated by the second block X and the correlation parameter calculator 830.
- Step S950 is a flowchart of a method for extracting correlation parameters between color planes for prediction according to an embodiment of the present invention. As shown in the figure, a neighbor block search step (S910), a correlation parameter calculation step (S930), and a prediction are shown. Step S950, which is applied to the apparatus of FIG. 4 as an example, will be described in parallel with the operation of the apparatus.
- the neighboring block search unit In operation 810, the second block X of the reconstructed previous plane corresponding to the first block Y to be encoded of the current plane is searched, and among the neighboring blocks of the second block X (FIG. 11 is a hatching block).
- the third block (assuming X ') having the smallest difference in pixel value from the second block X is searched according to the Sum of Absolute Difference (SAD) method, and the third block X' Search for the restored fourth block Y 'of the corresponding current plane.
- SAD Sum of Absolute Difference
- the correlation parameter calculator 830 may select between the third block X 'and the fourth block Y' based on the pixel value of the third block X 'and the pixel value of the fourth block Y'.
- the linear correlation parameter may be calculated.
- a parameter for minimizing an MSE value between the third block X 'and the fourth block Y' may be calculated as a correlation parameter according to a Mean Square Error (MSE) method.
- MSE Mean Square Error
- the prediction unit 450 generates the prediction block of the first block Y based on the correlation parameter calculated by the second block X and the correlation parameter calculator 830.
- An embodiment of the present invention is to encode another plane after encoding the base plane, and to perform a linear transformation based on the base plane to create a prediction screen (or image, or block) of another plane, Apply to extract the necessary correlation parameters.
- the default plane is the green plane and the other planes are the red and blue planes.
- the above prediction method applied to an embodiment of the present invention is referred to as inter plane prediction or inter color prediction.
- inter plane prediction or inter color prediction.
- prediction is performed on a block-by-block basis to predict blue and red signals using a green plane.
- the prediction screen is obtained based on the following equation (1) in the prediction unit 850 or the prediction step S950. Become.
- equation (1) can be expressed again as in the following equation (2).
- the correlation parameters are not transmitted directly from the encoding end, but in the neighboring block search unit 810 or the neighboring block search step S910, the pixels of the neighboring blocks restored with respect to the current block of the current blue plane and the corresponding green plane are restored. These two correlation parameters are found using the pixels of the neighboring block.
- the block most similar to the green block (X) at the corresponding position of the blue block (Y) to be currently encoded to find these two correlation parameters is selected.
- Search among neighboring blocks of the adjacent area see FIG. 11).
- the SAD used in the current motion search is applied as in Equation (3) below, but is not limited thereto.
- Equation (3) G '(x, y) represents the pixel value of the X block, and G' (x-m, y-n) represents the pixel value of the neighboring block changed by m, n in the X block.
- the block having the lowest SAD among the neighboring blocks is found and determined as a block for locating an optimal correlation parameter (hereinafter, referred to as an X 'block).
- an X 'block an optimal correlation parameter
- a correlation parameter using the correlation between green and blue at the position of the determined X 'block and the corresponding Y' block Wow To calculate.
- Wow Denotes coordinates having an optimum position, that is, pixel coordinates of the X 'block, and is calculated in the correlation parameter calculator 430 or the correlation parameter calculation step S930.
- a correlation parameter is calculated based on the found block, which is obtained by the following equations (5) and (6).
- This correlation parameter is a parameter that minimizes the MSE value between the X 'block and the Y' block in terms of mean square error (MSE).
- MSE mean square error
- M and N are the number of pixels in the X and Y axes of the block
- G '(im *, jn *) is the pixel value of the X' block
- B '(im *, jn *) is The pixel value of the Y 'block is shown.
- the prediction unit 850 or the prediction step S950 predicts the blue color from the pre-decoded green, and the correlation parameter obtained in the correlation parameter calculation unit 430 or the correlation parameter calculation step S930. Wow By substituting into Eq. (2) To produce
- the area of the neighboring block for searching similar blocks is as shown in FIG. 11 as an example.
- the search area is minimized, for example, in units of 4x4 blocks. That is, similar blocks are found while moving pixel by pixel only in a region of a 4 ⁇ 4 block that is about the minimum block unit searched in an area such as the left, top, and right upper ends of the region to be encoded.
- the red plane is also encoded by applying the same method as described above.
- the blue plane is encoded, only the available color difference information is the green plane, but when the red plane information is encoded, the blue plane is also encoded. Therefore, the blue plane information is used in the above-described interplane prediction. Can be used for
- the method of extracting correlation parameters between color planes for prediction according to the embodiment of the present invention described with reference to FIG. 9 may be implemented as a computer-readable recording medium including program instructions for performing various computer-implemented operations.
- the computer readable recording medium may include program instructions, local data files, local data structures, etc. alone or in combination.
- the recording medium may be those specially designed and configured for the embodiments of the present invention, or may be known and available to those skilled in computer software.
- Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical recording media such as CD-ROMs, DVDs, magnetic-optical media such as floppy disks, and ROM, RAM, flash memory, and the like.
- Hardware devices specifically configured to store and execute the same program instructions are included.
- the recording medium may be a transmission medium such as an optical or metal wire, a waveguide, or the like including a carrier wave for transmitting a signal specifying a program command, a local data structure, or the like.
- Examples of program instructions may include high-level language code that can be executed by a computer using an interpreter, as well as machine code such as produced by a compiler.
- the embodiment of the present invention is applied to the field of image data compression technology, in particular, in inter plane prediction, and uses the specific block having the highest similarity to the current block among the neighboring blocks. Extracting the best correlation parameter and performing the best prediction for the current block based on the best correlation parameter, it is a very useful invention to improve the coding efficiency by increasing the accuracy of the parameter, making an accurate estimation image, and reducing additional information.
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Description
상관 파라미터 산출부(830) 또는 상관 파라미터 산출 단계(S530)에서는 주변 블록 중에서 가장 SAD가 낮은 블록을 찾아 이를 최적의 상관 파라미터를 찾기 위한 블록(이후, X'블록이라고 가정함)으로 결정하고, 이 결정된 X'블록과 이에 대응하는 Y'블록의 위치에서 그린과 블루 사이의 상관 관계를 이용하여 상관 파라미터 와 를 산출한다. 다음의 식 (4)에서 와 는 최적 위치를 갖는 좌표 즉, X' 블록의 화소 좌표를 나타내는 것으로, 상관 파라미터 산출부(430) 또는 상관 파라미터 산출 단계(S930)에서 산출된다.
Claims (15)
- 현재 플레인의 부호화 할 제 1 블록에 대응하는 복원된 이전 플레인의 제 2 블록에 대하여, 상기 제 2 블록의 주변 블록 중에서 그 제 2 블록과의 화소값의 차가 가장 작은 제 3 블록을 탐색하는 주변 블록 탐색부;상기 제 3 블록 및 그 제 3 블록에 대응하는 상기 현재 플레인의 복원된 제 4 블록에 근거하여, 상기 제 3 블록과 상기 제 4 블록간의 상관 파라미터를 산출하는 상관 파라미터 산출부; 및상기 제 2 블록 및 상기 산출된 상관 파라미터에 근거하여 상기 제 1 블록을 예측하는 예측부;를 포함하는 것을 특징으로 하는 예측을 위한 컬러 플레인간의 상관 파라미터 추출 장치.
- 제 1 항에 있어서,상기 주변 블록 탐색부는SAD(Sum of Absolute Difference) 방식에 따라 상기 제 3 블록을 탐색하는 것을 특징으로 하는 예측을 위한 컬러 플레인간의 상관 파라미터 추출 장치.
- 제 1 항에 있어서,상기 상관 파라미터 산출부는MSE(Mean Square Error) 방식에 따라 상기 제 3 블록과 상기 제 4 블록간의 MSE값을 최소화는 파라미터를 상기 상관 파라미터로 산출하는 것을 특징으로 하는 예측을위한 컬러 플레인간의 상관 파라미터 추출 장치.
- 현재 플레인의 부호화 할 제 1 블록에 대응하는 복원된 이전 플레인의 제 2 블록을 탐색하는 단계;상기 제 2 블록의 주변 블록 중에서 그 제 2 블록과의 화소값의 차가 가장 작은 제 3 블록을 탐색하는 단계;상기 제 3 블록 및 그 제 3 블록에 대응하는 상기 현재 플레인의 복원된 제 4 블록을 탐색하는 단계;상기 제 3 블록과 상기 제 4 블록간의 상관 파라미터를 산출하는 단계; 및상기 제 2 블록 및 상기 산출된 상관 파라미터에 근거하여 상기 제 1 블록을 예측하는 단계;를 포함하는 것을 특징으로 하는 예측을 위한 컬러 플레인간의 상관 파라미터 추출 방법.
- 제 6 항에 있어서,상기 제 3 블록은 SAD(Sum of Absolute Difference) 방식에 따라 탐색하는 것을 특징으로 하는 예측을 위한 컬러 플레인간의 상관 파라미터 추출 방법.
- 제 6 항에 있어서,상기 상관 파라미터는MSE(Mean Square Error) 방식에 따라 상기 제 3 블록과 상기 제 4 블록간의 MSE값을 최소화하는 파라미터로 산출하는 것을 특징으로 하는 예측을 위한 컬러 플레인간의 상관 파라미터 추출 방법.
- 제 6 항 내지 제 10 항 중 어느 한 항의 상기 예측을 위한 컬러 플레인간의 상관 파라미터 추출 방법이 프로그램으로 기록된 컴퓨터로 읽을 수 있는 기록 매체.
- 영상 부호화 장치에 있어서,기본 플레인에 대하여 인트라 예측하는 인트라 예측기;주변 블록과 상기 기본 플레인을 입력으로 하여 컬러 플레인간의 상관 파라미터를 추출하는 인터 플레인 예측기;상기 인트라 예측기 및 상기 인터 플레인 예측기에 의해 수행된 예측 중 최적의 예측을 선택하며, 예측된 신호와 원신호의 차이인 잔여신호를 변환하는 변환기;상기 변환기에 의해 변환된 잔여신호를 양자화하는 양자화기; 및상기 양자화기에 의해 양자화된 신호를 엔트로피 부호화하는 엔트로피 부호화기를 포함하는 것을 특징으로 하는 영상 부호화 장치.
- 영상 부호화 방법에 있어서,기본 플레인에 대하여 인트라 예측하는 단계;주변 블록과 상기 기본 플레인을 입력으로 하여 컬러 플레인간의 상관 파라미터를 추출하여 인터 플레인 예측하는 단계;상기 인트라 예측 및 상기 인터 플레인 예측에 의해 수행된 예측 중 최적의 예측을 선택하며, 예측된 신호와 원신호의 차이인 잔여신호를 변환하는 단계;상기 변환단계에 의해 변환된 잔여신호를 양자화하는 단계; 및상기 양자화기에 의해 양자화된 신호를 엔트로피 부호화하는 단계;를 포함하는 것을 특징으로 하는 영상 부호화 방법.
- 영상 복호화 장치에 있어서,입력되는 비트스트림으로부터 엔트로피 신호를 복호화하는 엔트로피 복호기;복호된 상기 엔트로피 신호를 역양자화하는 역양자화기;상기 역양자화된 신호를 역변환하여 잔여신호를 생성하는 역변환기;상기 비트스트림으로부터 추출된 신호에 기초하여 인트라 예측 또는 인터 플레인 예측을 수행하는 예측기; 및상기 예측기에 의해 수행된 예측 영상에 상기 잔여신호를 가산하여 복호 영상을 생성하는 가산기;를 포함하는 것을 특징으로 하는 영상 복호화 장치.
- 영상 복호화 방법에 있어서,입력되는 비트스트림으로부터 엔트로피 신호를 복호화하는 단계;복호된 상기 엔트로피 신호를 역양자화하는 단계;상기 역양자화된 신호를 역변환하여 잔여신호를 생성하는 단계;상기 비트스트림으로부터 추출된 신호에 기초하여 인트라 예측 또는 인터 플레인 예측을 수행하는 단계; 및상기 예측 수행단계에 의해 수행된 예측 영상에 상기 잔여신호를 가산하여 복호 영상을 생성하는 단계;를 포함하는 것을 특징으로 하는 영상 복호화 방법.
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JP2002058031A (ja) * | 2000-08-08 | 2002-02-22 | Nippon Telegr & Teleph Corp <Ntt> | 画像符号化方法及び装置、並びに、画像復号化方法及び装置 |
KR20050039057A (ko) * | 2003-10-23 | 2005-04-29 | 삼성전자주식회사 | 칼라 영상을 위한 인트라 부호화/복호화 방법 및 장치 |
JP2008278464A (ja) * | 2007-04-06 | 2008-11-13 | Canon Inc | 多次元データの符号化装置及び復号装置並びにその制御方法 |
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JP2002058031A (ja) * | 2000-08-08 | 2002-02-22 | Nippon Telegr & Teleph Corp <Ntt> | 画像符号化方法及び装置、並びに、画像復号化方法及び装置 |
KR20050039057A (ko) * | 2003-10-23 | 2005-04-29 | 삼성전자주식회사 | 칼라 영상을 위한 인트라 부호화/복호화 방법 및 장치 |
JP2008278464A (ja) * | 2007-04-06 | 2008-11-13 | Canon Inc | 多次元データの符号化装置及び復号装置並びにその制御方法 |
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