WO2011111954A2 - 움직임 벡터 해상도 조합을 이용한 움직임 벡터 부호화/복호화 방법 및 장치와 그를 이용한 영상 부호화/복호화 방법 및 장치 - Google Patents
움직임 벡터 해상도 조합을 이용한 움직임 벡터 부호화/복호화 방법 및 장치와 그를 이용한 영상 부호화/복호화 방법 및 장치 Download PDFInfo
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- WO2011111954A2 WO2011111954A2 PCT/KR2011/001492 KR2011001492W WO2011111954A2 WO 2011111954 A2 WO2011111954 A2 WO 2011111954A2 KR 2011001492 W KR2011001492 W KR 2011001492W WO 2011111954 A2 WO2011111954 A2 WO 2011111954A2
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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
- H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
- H04N19/51—Motion estimation or motion compensation
- H04N19/513—Processing of motion vectors
- H04N19/517—Processing of motion vectors by encoding
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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
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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
- H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
- H04N19/51—Motion estimation or motion compensation
- H04N19/523—Motion estimation or motion compensation with sub-pixel accuracy
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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
- H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
- H04N19/51—Motion estimation or motion compensation
- H04N19/567—Motion estimation based on rate distortion criteria
Definitions
- the present invention relates to a motion vector encoding / decoding method and apparatus using a motion vector resolution combination, and a video encoding / decoding method and apparatus using the same. More particularly, the present invention relates to a method and apparatus for adaptively selecting a combination of resolutions of motion vectors that are efficient in encoding an image, and determining and encoding motion vectors based on the combinations thereof to improve compression efficiency. The present invention also relates to a method and apparatus for improving the reconstruction efficiency of an image by receiving a bitstream from such a motion encoding apparatus and determining and decoding the motion vector correspondingly according to a combination of resolutions of selected motion vectors.
- H.264 / AVC is the standard for the most highly compressed video codecs among the standardized video coders and decodes to date.
- the H.264 / AVC standard includes intra prediction with directionality to improve compression efficiency, integer transform in 4x4 pixel units, and block mode with various sizes from 16x16 pixel size to 4x4 pixel size. Mode and a deblocking filter to predictively encode an image.
- the H.264 / AVC standard performs motion estimation by interpolating images up to 1/2 pixel unit and 1/4 pixel unit in order to find a more accurate motion vector.
- motion vector decoding corresponds to motion vector encoding
- the present invention has a main object to improve compression efficiency by adaptively selecting a combination of resolutions of efficient motion vectors and determining and encoding motion vectors based thereon.
- the present invention provides a coding cost calculator for calculating a coding cost according to a motion vector resolution for each combination of a plurality of motion vector resolutions including at least one or more motion vector resolutions. ; A resolution combination determiner that selects a combination of one motion vector resolution by using a coding cost calculated for each combination of motion vector resolutions; And a motion information encoder for outputting motion vector encoded data encoded with a motion vector determined according to a combination of selected motion vector resolutions.
- a motion vector of the image is determined and determined according to a motion vector resolution for each combination of a plurality of motion vector resolutions including at least one motion vector resolution.
- a predictor for generating a predictive image of the image using the vector A subtractor configured to generate a residual image by subtracting the image and the predicted image; A converter and quantizer for transforming and quantizing the residual image; And encoding the transformed and quantized residual images to generate image encoded data for each combination of motion vector resolutions, calculating encoding cost of image encoded data for each combination of motion vector resolutions, and encoding image encoded data for each combination of motion vector resolutions.
- an apparatus for decoding a motion vector comprising: a resolution combination decompressor for decoding a combination of resolution index data extracted from a bitstream to restore a combination of motion vector resolutions; And a motion vector reconstructor for reconstructing the motion vector by decoding the motion vector encoded data extracted from the bitstream according to the combination of the reconstructed motion vector resolution.
- motion vector encoded data extracted from a bitstream according to a combination of motion vector resolutions that are reconstructed by decoding resolution combination index data extracted from a bitstream is decoded.
- a decoder to decode the motion vector by decoding, and to decode the encoded image extracted from the bitstream to restore the transformed and quantized residual image;
- An inverse quantizer and an inverse converter that inverse quantizes and inverse transforms the transformed and quantized residual image to reconstruct the residual image;
- a predictor for generating a predicted image of the image by using the reconstructed motion vector;
- an adder for reconstructing the image by adding the residual image and the predictive image.
- a method of encoding an image comprising: determining a motion vector of an image according to a motion vector resolution for each combination of a plurality of motion vector resolutions including at least one motion vector resolution; Generating a predicted image of the image using the determined motion vector; Generating a residual image by subtracting the image and the predictive image; Converting and quantizing the residual image; Encoding the transformed and quantized residual images to generate image encoded data for each combination of motion vector resolutions; Calculating the encoding cost of the image encoded data for each combination of the motion vector resolutions; Selecting a combination of motion vector resolutions by using encoding cost of image encoded data for each combination of motion vector resolutions; And generating a bitstream including encoded image encoded data using a motion vector determined according to the motion vector resolution according to the combination of the selected motion vector resolutions.
- a method of decoding a motion vector comprising: reconstructing a combination of motion vector resolutions by decoding resolution combination index data extracted from a bitstream; And reconstructing the motion vector by decoding the motion vector encoded data extracted from the bitstream according to the combination of the reconstructed motion vector resolution.
- the motion vector encoded data extracted from the bitstream according to the combination of the motion vector resolution, which is reconstructed by decoding the resolution combination index data extracted from the bitstream is decoded.
- Restoring a motion vector by decoding Reconstructing the transformed and quantized residual image by decoding the image encoded data extracted from the bitstream; Inverse quantization and inverse transformation of the transformed and quantized residual image to reconstruct the residual image; Generating a predicted image of the image by using the reconstructed motion vector; And reconstructing the image by adding the residual image and the prediction image.
- the compression efficiency can be improved by adaptively selecting a combination of resolutions of efficient motion vectors and determining and encoding the motion vectors based on the combinations.
- FIG. 1 is a block diagram schematically illustrating a video encoding apparatus according to an embodiment of the present invention
- FIG. 2 is an exemplary view showing a state of determining a motion vector through motion estimation according to an embodiment of the present invention
- FIG. 3 is a block diagram schematically illustrating an encoder according to an embodiment of the present invention.
- FIG. 4 is a block diagram schematically illustrating a motion vector encoding apparatus according to an embodiment of the present invention.
- FIG. 5 is an exemplary diagram for describing a process of estimating a motion vector having a motion vector resolution of a small pixel unit using template matching according to an embodiment of the present invention
- FIG. 6 is an exemplary view for explaining a process of selecting a motion vector according to an embodiment of the present invention.
- FIG. 7 is a flowchart illustrating a motion vector encoding method according to an embodiment of the present invention.
- FIG. 8 is a flowchart illustrating a video encoding method according to an embodiment of the present invention.
- FIG. 9 is a flowchart for explaining another example of implementing an image encoding method according to an embodiment of the present invention.
- FIG. 10 is a block diagram schematically illustrating an image decoding apparatus according to an embodiment of the present invention.
- FIG. 11 is a block diagram schematically illustrating a decoder according to an embodiment of the present invention.
- FIG. 12 is a block diagram schematically illustrating a motion vector decoding apparatus according to an embodiment of the present invention.
- FIG. 13 is a flowchart for explaining a motion vector decoding method according to an embodiment of the present invention.
- FIG. 14 is a flowchart illustrating an image decoding method according to an embodiment of the present invention.
- the motion vector encoding apparatus (Motion Vector Encoding Apparatus), the motion vector decoding apparatus (Motion Vector Decoding Apparatus), the video encoding apparatus (Video Encoding Apparatus), and the video decoding apparatus (Video Decoding Apparatus) will be described later.
- User terminals such as computers, notebook computers, personal digital assistants (PDAs), portable multimedia players (PMPs), PlayStation Portables (PSPs), mobile communication terminals, etc.
- a server terminal such as an application server and a service server, and a communication device such as a communication modem for performing communication with various devices or a wired / wireless communication network, various programs and data for encoding or decoding a motion vector, or encoding or decoding an image.
- Memory to save, run the program Means a variety of devices including a microprocessor for operation and control.
- the motion vector or the image encoded in the bitstream by the motion vector encoding apparatus or the image encoding apparatus is real time or non-real time through a wired or wireless communication network such as the Internet, a local area wireless communication network, a wireless LAN network, a WiBro network, a mobile communication network, or the like.
- a wired or wireless communication network such as the Internet, a local area wireless communication network, a wireless LAN network, a WiBro network, a mobile communication network, or the like.
- Is transmitted to the motion vector decoding apparatus or the image decoding apparatus through various communication interfaces such as a universal serial bus (USB), and the like, are decoded by the motion vector decoding apparatus and restored as a motion vector or decoded by the image decoding apparatus to the image. Can be recycled.
- USB universal serial bus
- a moving picture is composed of a series of pictures, and each picture is divided into a predetermined area such as a block.
- the divided blocks are largely classified into intra blocks and inter blocks according to encoding methods.
- An intra block refers to a block that is encoded by using an intra prediction coding method.
- An intra prediction coding is performed by using pixels of blocks that are previously encoded, decoded, and reconstructed in a current picture that performs current encoding.
- a prediction block is generated by predicting pixels of a block, and a difference value with pixels of the current block is encoded.
- An inter block refers to a block that is encoded using inter prediction coding.
- Inter prediction coding generates a prediction block by predicting a current block within a current picture by referring to one or more past or future pictures, and then generates a current block. This is a method of encoding a difference value with.
- a picture referred to for encoding or decoding the current picture is referred to as a reference picture.
- FIG. 1 is a block diagram schematically illustrating a video encoding apparatus according to an embodiment of the present invention.
- the image encoding apparatus 100 is an apparatus for encoding an image, and includes a predictor 110, a subtracter 120, a transformer and quantizer 130, and an encoder.
- the encoder may include an encoder 140, an inverse quantizer and an inverse transformer 150, an adder 160, and a reference picture memory 170.
- the predictor 110 determines a motion vector of an image according to a motion vector resolution for each combination of a plurality of motion vector resolutions including at least one motion vector resolution and uses the determined motion vector. Generate a predicted image of an image. That is, a motion including a motion vector and a reference frame index of the current block by estimating the motion of a block to be encoded in the predictor 110 input image (hereinafter referred to as a current block).
- the prediction block of the current block is generated by determining motion information and compensating for the motion of the current block by using the determined motion information of the current block.
- the predictor 110 further estimates the motion vector at a motion vector resolution that is not included in the combination of the motion vector resolutions selected by the encoder 140 among the available motion vector resolutions, and uses the estimated motion vector to estimate the predicted image. Can be generated.
- the predictor 110 may estimate the motion vector of the motion vector resolution of the pixel unit not included in the motion vector resolution combination by using template matching (TM).
- template matching refers to a method of estimating a motion vector of a current block by using pixels that are already encoded, decoded, and reconstructed among neighboring pixels (or adjacent pixels among neighboring pixels) of a current block to be encoded. A method of additionally estimating a motion vector using template matching will be described in detail with reference to FIGS. 5 and 6 in a later process.
- the predictor 110 determines the motion information on a block basis and generates a prediction block in coding units (eg, blocks, slices, pictures, and picture groups (GOPs). of picture), and an image of each prediction block generated by performing the coding unit may be generated as a prediction image.
- coding units eg, blocks, slices, pictures, and picture groups (GOPs). of picture
- an image of each prediction block generated by performing the coding unit may be generated as a prediction image.
- the input image may be an image (eg, an image corresponding to an arbitrary slice in an arbitrary picture) for a predetermined coding unit constituting a video
- the prediction image may be an input image. It may be an image (eg, a slice image in which prediction blocks are collected) for a predetermined coding unit including prediction blocks generated by predicting blocks in the block.
- the predicted image generated by the predictor 110 may be generated according to the motion vector resolution for each combination of the motion vector resolutions. That is, the predictor 110 determines a motion vector for each block in the input image according to the motion vector resolution for each combination of the motion vector resolutions, generates a prediction block using the motion vector, and generates a prediction image by collecting the generated prediction blocks.
- the prediction image may be generated as many as the number of combinations of motion vector resolutions.
- one prediction image may be generated for an image of a coding unit.
- the subtractor 120 subtracts the input image and the prediction image to generate a residual image.
- the residual image is an image generated by subtracting an input image and a prediction image to be encoded, and means an image including a residual signal that is a difference between a pixel of the input image and a pixel of the prediction image.
- the predicted image generated by the predictor 110 is generated by the number of combinations of motion vector resolutions
- the residual image generated by the subtractor 120 may be generated by the number of combinations of motion vector resolutions, and further estimated.
- a prediction image is generated according to the motion vector, a residual image of the prediction image may be generated.
- the converter and quantizer 130 transforms and quantizes the residual image. That is, the transformer and the quantizer 130 convert the residual signal of the residual image generated by the subtractor 120 into the frequency domain to generate a transformed residual image having a transform coefficient and convert the residual signal.
- the transform coefficients of the residual image are quantized to generate transformed and quantized residual images.
- a transform method used a method of transforming an image signal in a spatial domain into a frequency domain such as a Hadamard transform or a discrete cosine transform based integer transform is used.
- various quantization techniques such as Dead Zone Uniform Threshold Quantization (DZUTQ) or quantization weighted matrix (DZUTQ) may be used.
- DZUTQ Dead Zone Uniform Threshold Quantization
- DZUTQ quantization weighted matrix
- the encoder 140 encodes the transformed and quantized residual images to generate image encoded data for each combination of motion vector resolutions, calculates encoding cost of the image encoded data for each combination of motion vector resolutions, and calculates the image for each combination of motion vector resolutions.
- the combination of the motion vector resolutions is selected using the encoding cost of the encoded data, and the encoded image encoded data is output using the motion vector determined according to the motion vector resolution according to the selected combination of the motion vector resolutions.
- the entropy encoding technique may be used as a technique for encoding the quantized transform coefficients by the encoder 140, but various encoding techniques may be used without being limited thereto.
- the encoder 140 will be described in detail with reference to FIGS. 2 and 3.
- the inverse quantizer and inverse converter 150 inverse quantizes and inverse transforms the transformed and quantized residual image to reconstruct the residual image. That is, the inverse quantizer and the inverse transformer 150 inverse quantizes the transformed and quantized residual images transmitted from the transformer and the quantizer 130 to restore a residual image having a transform coefficient, and reconstructs the residual image having a transform coefficient. Inverse conversion restores a residual image having a residual signal. In this case, the inverse quantizer and the inverse transformer 150 may reconstruct the residual image by performing the transformed and quantized method in the inverse of the transformer and the quantizer 130.
- the inverse quantizer and inverse transformer 150 do not inversely quantize and inversely transform all the transformed and quantized residual images transmitted from the transformer and quantizer 130, but a combination of motion vector resolutions selected by the encoder 140. Only the residual image of the predicted image generated by using the motion vector determined according to the transformed and quantized residual image may be inversely quantized and inversely transformed to restore only the residual image according to the combination of the corresponding motion vector resolutions.
- the adder 160 reconstructs the input image by adding the residual image reconstructed by the inverse quantizer and the inverse transformer 150 and the predictive image generated by the predictor 110.
- the reference picture memory 170 stores a reference picture in which reconstructed input pictures are accumulated by picture units, and the stored reference pictures may be used by the predictor 110 to predict the next input picture or the next picture.
- the image encoding apparatus 100 may add an intra predictor, a deblocking filter, or the like for intra prediction in the predictor 110. It can be included as.
- the subtractor 120 may generate a residual image by subtracting the input image and the prediction image generated by the intra predictor, and the transformer and quantizer 130 and the inverse quantizer and inverse transformer 150 may generate the residual image. Transform and quantization for and inverse transform and inverse quantization on the transformed and quantized residual image may be further performed.
- the encoder 140 may generate image encoded data by encoding the transformed and quantized residual image, which is included in the bitstream.
- the deblocking filter deblocks the input image to be reconstructed.
- the deblocking filtering refers to an operation of reducing block distortion generated by encoding an image in block units, and applying a deblocking filter to a block boundary and a macroblock boundary, or applying a deblocking filter only to a macroblock boundary or a deblocking filter. You can optionally use one of the methods that does not use.
- FIG. 2 is an exemplary view showing a state of determining a motion vector through motion estimation according to an embodiment of the present invention.
- the predictor 110 finds a reference block that is the block most similar to the current block among predetermined search regions within several reference pictures that can be used to determine a motion vector of the current block, and finds a reference picture index and a reference block representing the reference picture.
- the motion of the current block is estimated by acquiring the indicated motion vector as motion information.
- a method of determining a motion vector may be represented by Equation 1 and Equation 2.
- Equation 1 Denotes a motion vector of the current block, where the position of the motion vector may exist anywhere in the plurality of reference pictures. Represents the original current block, Is Indicates a reference block indicated by. Two blocks and Represents a function that calculates the sum of absolute values of differences in pixels between Stands for Lagrange Multiplier, Denotes a predictive motion vector, Indicates a reference picture index, which is an index to indicate a reference picture, Is Wow Difference between Represents a function for calculating the amount of bits required to encode a function, where mcost ( MV ) is Represents an encoding cost required for encoding motion information according to the present invention.
- Equation 2 Represents the motion vector of the current block that is finally determined, Represents a motion search area.
- the predictor 110 may determine a predetermined motion search region of several reference pictures. Angle that can be considered within The coding cost for is calculated using Equation 1 and has the lowest coding cost. Can be found using Equation 2 and determined as the motion vector of the current block. In Equation 1, the encoding cost is calculated as the rate-distortion cost, but the encoding cost is not necessarily calculated as the rate-distortion cost and may be calculated in various other ways.
- Equation 3 Represents the same as described above through Equation 1, Denotes a block mode index for identifying an inter block mode.
- S mode represents a set of interblock modes from blocks of 16x16 pixels to blocks of 4x4 pixels
- Silver block mode Denotes a reconstructed block that is reconstructed by encoding and decoding the current block using silver
- Wow represents a function for calculating the sum of squared errors of pixels in Silver block mode
- Rate ( MV i , PMV , ref_idx , Coeff i ) is a block mode.
- rdcost ( i ) is the block mode.
- i * represents an index indicating the block mode of the current block that is finally determined.
- the predictor 110 calculates encoding costs for several interblock modes by using Equation 3, and finds i * , which is an index indicating a block mode having a minimum encoding cost, by using Equation 4. It can be determined as the block mode of the final current block.
- the encoding cost is calculated as a rate-distortion cost, but the encoding cost is not necessarily calculated as the rate-distortion cost as shown in Equation 3 and may be calculated in various other ways.
- the predictor 110 calculates the encoding cost, but the present invention is not limited thereto.
- the encoder 140 calculates the encoding cost and passes the calculated encoding cost to the predictor 110 so that the predictor 110 may calculate the encoding cost.
- the motion vector may be determined.
- the motion vector obtained through Equation 2 is predictively encoded, and the predictor 110 or the encoder 140 encodes a differential motion vector which is a difference value between the motion vector and its predicted motion vector as shown in Equation 5.
- motion vectors are obtained by performing motion estimation at resolutions of integer pixel units, 1/2 pixel units, and 1/4 pixel units, and differential motion vectors of the obtained motion vectors are obtained. Is encoded using a code table to which a bit string for each multiple of quarter pixels as shown in Table 1 is assigned.
- Long codewords are used to encode a motion vector having a small size, such as a codeword for encoding a motion vector having a resolution of 1/2 pixel and a resolution of a quarter pixel and a motion of a resolution of an integer pixel. This is because a codeword for encoding a vector is used together.
- a combination of a plurality of motion vector resolutions including at least one motion vector is provided, and motion estimation and motion estimation are performed at a motion vector resolution according to each combination for each combination of motion vector resolutions. Compensation, encoding of residual images, encoding of motion vectors, and calculating a coding cost accordingly select a combination of motion vector resolutions having a minimum encoding cost and determine the motion vector resolution according to the motion vector resolution of the combination of the selected motion vector resolutions.
- a bitstream including encoded image encoded data and motion vector encoded data is generated based on the.
- FIG. 3 is a block diagram schematically illustrating an encoder according to an embodiment of the present invention.
- the encoder 140 may include a predicted residual encoder 310 and a motion vector encoder 320.
- the predictive residual encoder 310 encodes the transformed and quantized residual image to generate image encoded data for each combination of motion vector resolutions. That is, the predictive residual encoder 310 encodes the residual image transformed and quantized by the transformer and the quantizer 130. The residual residual encoder 310 encodes the transformed and quantized residual image for each combination of motion vector resolutions, and thus the image for each combination of motion vector resolutions. Generate encoded data.
- the motion vector encoder 320 calculates the encoding cost of the image encoded data for each combination of the motion vector resolution, selects the combination of the motion vector resolutions using the encoding cost of the image encoded data for the combination of the motion vector resolution, and selects the selected motion vector.
- the motion vector encoded data encoded by the motion vector determined according to the resolution of the motion vector according to the combination of resolutions is output. That is, the motion vector encoder 320 receives various pieces of information transmitted from the predictor 110 and the predictive residual encoder 310 in the process of encoding the image encoded data of the combination of the motion vector resolutions generated by the predictive residual encoder 310.
- Calculates the encoding cost for encoding each image encoded data selects a combination of motion vector resolutions from among a combination of several motion vector resolutions, and uses a motion vector determined according to the selected combination of motion vector resolutions. Outputs the encoded motion vector encoded data.
- the motion vector encoder 320 encodes a motion vector determined for each combination of the motion vector resolutions and calculates the motion vector encoding data for each combination of the motion vector resolutions when calculating the encoding cost for each combination of the motion vector resolutions.
- the generated motion vector encoded data may be output without generating motion vector encoded data again.
- the motion vector encoder 320 will be described in detail with reference to FIG. 4.
- FIG. 4 is a block diagram schematically illustrating a motion vector encoding apparatus according to an embodiment of the present invention.
- the motion vector encoding apparatus may be implemented as the motion vector encoder 320 in the encoder 140 described above with reference to FIG. 3.
- the motion vector encoding apparatus is called a motion vector encoder 320.
- the motion vector encoder 320 may include a coding cost calculator 410, a motion information encoder 430, and a resolution combination determiner 420.
- the encoding cost calculator 410 calculates an encoding cost according to the motion vector resolution of each motion vector resolution combination for each combination of a plurality of motion vector resolutions including at least one motion vector resolution. That is, the encoding cost calculator 410 encodes the residual image, which is a difference between the predicted image and the input image generated by using the motion vector including the motion vector and the reference picture index determined according to the motion vector resolution for each combination of the motion vector resolutions. Calculate the cost of doing it.
- the motion vector resolution may include one or more of an integer pixel resolution, a 1/2 pixel resolution, a 1/4 pixel resolution, and a 1/8 pixel resolution, but is not limited thereto. It may also include a pixel-by-pixel resolution.
- the combination of the motion vector resolutions refers to a group including at least one or more of the motion vector resolutions available for motion estimation.
- the usable motion vector resolution refers to a motion vector resolution that is previously promised to be used as the motion vector resolution in the image encoding apparatus 100, the image decoding apparatus or the motion vector encoding apparatus, and the motion vector decoding apparatus, which will be described later.
- the available motion vector resolutions are motion vector resolutions of integer and 1/2 pixel units. If the video encoding apparatus and the video decoding apparatus have previously promised to use only motion vector resolutions of integer, 1/2 pixel, 1/4 pixel, and 1/8 pixel units, the available motion vector resolution is integer, 1/2 pixel. The motion vector resolution in units of 1/4, 1/8 pixels becomes the available motion vector resolution.
- the combination may be composed of 15 kinds of the first to the fifteenth combination of the motion vector resolution as exemplarily shown in Table 2.
- the type and combination of such motion vector resolutions are merely exemplary, and the number or type of motion vector resolutions may be used, and the combination of motion vector resolutions may be configured in various ways. For example, as shown in the above example, four types of motion vector resolutions may be used, but a combination of motion vector resolutions may be configured in ten types, and only two types of motion vector resolutions may be used.
- the combination of motion vector resolution may consist of three, two, and the like.
- the encoding cost calculator 410 is required when predicting and encoding the input image using the motion vector determined by estimating the motion at the resolution of the integer pixel unit included in the first combination of the motion vector resolutions.
- the encoding cost is calculated as the encoding cost of the first combination and the prediction image is encoded using the motion vector determined by estimating the motion at a resolution of 1/2 pixel included in the second combination of the motion vector resolution.
- the encoding cost required is calculated as the encoding cost of the second combination, and in this way the encoding cost of the third to fourteenth combinations is calculated, and an integer included in the fifteenth combination of the motion vector resolution, 1/2, 1 Coding required when predicting and encoding an input image using a motion vector determined by estimating motion at a resolution of 4/4 and 1/8 pixel units It calculates a cost for the coding of the 15 combinations.
- the encoding cost calculator 410 determines at least one of a motion vector and a block mode for each block according to the motion vector resolution for each combination of motion vector resolution, and calculates an encoding cost by using at least one of the determined motion vector and the determined block mode. Can be calculated
- the encoding cost calculator 410 may calculate the encoding cost by encoding the motion vector using a different code table according to the motion vector resolution for each combination of the motion vector resolutions. That is, the encoding cost calculator 410 may store a different code table in advance for each combination of motion vector resolutions and use the same to encode a motion vector having a motion vector resolution for each combination of motion vector resolutions.
- a code table different for each combination of motion vector resolutions refers to a code table for encoding by considering only motion vectors having a motion vector resolution in a combination system of each motion vector resolution.
- the code table for the first combination of motion vector resolutions is a code table for encoding by considering only motion vectors of resolution of integer pixel units
- the code table for the twelfth combination of the vector resolutions is a code table for encoding in consideration of only motion vectors having resolutions of integer, 1/2, and 1/8 pixel units, as exemplarily shown in Table 4.
- a code table for encoding a motion vector determined for each combination of motion vector resolutions is configured differently to be suitable for each combination of motion vector resolutions, and the selected motion vector resolution is selected.
- the resolution combination determiner 420 selects a combination of motion vector resolutions by using an encoding cost calculated for each combination of motion vector resolutions. That is, the resolution combination determiner 420 compares the encoding cost for each combination of motion vector resolutions calculated by the encoding cost calculator 410 and selects a combination of motion vector resolutions having the smallest encoding cost.
- the resolution combination determiner 420 may select a combination of motion vector resolutions for each coding unit including at least one of a block, a slice, a picture, and a picture group.
- the resolution combination determiner 420 may select a combination of motion vector resolutions in the same manner as in Equation 6.
- Equation 6 k represents a resolution combination index for identifying a combination of motion vector resolutions.
- RDcost (k) represents a rate-distortion cost as an encoding cost incurred when all blocks in a coding unit are encoded using a combination of motion vector resolutions corresponding to the resolution combination index k .
- k * represents a resolution combination index for identifying a combination of motion vector resolutions selected by resolution combination determiner 420.
- the resolution combination index k * for identifying the combination of the motion vector resolutions selected by the resolution combination determiner 420 is included in the bitstream when encoded by the motion information encoder 430 and generated as the resolution combination index data.
- the motion information encoder 430 outputs motion vector encoded data obtained by encoding a motion vector determined according to a combination of selected motion vector resolutions. That is, when a combination of motion vector resolutions is selected by the resolution combination determiner 420, the motion information encoder 430 selects from among motion vector encoded data generated in advance in the process of calculating the encoding cost by the encoding cost calculator 410.
- the resolution combination determiner 420 outputs motion vector encoded data encoded by a motion vector determined according to the motion vector resolution of the combination of the motion vector resolutions selected by the resolution combination determiner 420.
- the motion vector encoded data output from the motion information encoder 430 is also generated for each block in the predetermined coding unit such as a slice.
- the motion vector encoded data may further include a reference picture index as well as a motion vector.
- the motion information encoder 430 may output resolution combination index data by encoding a resolution combination index indicating a combination of the selected motion vector resolutions.
- the resolution combination index data is additionally included in the bitstream and used to identify a combination of motion vector resolutions in the motion vector decoding apparatus or the image decoding apparatus.
- a motion vector resolution that is not included in a combination of motion vector resolutions selected for each predetermined coding unit among the available motion vector resolutions generates an optimal coding efficiency in a part of regions or blocks within the predetermined coding unit.
- a motion vector having a more efficient motion vector resolution is determined by estimating the motion in consideration of the motion vector resolution not included in the combination of the motion vector resolutions for each region or block encoding.
- an embodiment of the present invention may use template matching.
- FIG. 5 is an exemplary diagram for describing a process of estimating a motion vector having a motion vector resolution not included in a combination of motion vector resolutions using template matching according to an embodiment of the present invention.
- the predictor 110 is most similar to a neighboring pixel of the current block in the reference picture at a motion vector resolution that is not included in the combination of motion vector resolutions selected by the encoder 140 among the available motion vector resolutions.
- a reference block having adjacent pixels is found to obtain a motion vector indicating the reference block.
- the search region for estimating the motion by using template matching at a motion vector resolution not included in the combination of the motion vector resolution may be limited to a peripheral region of the motion vector determined according to the combination of the selected motion vector resolution.
- the peripheral area of the motion vector may be an area that is equally or differently spaced apart by a predetermined number of pixels with respect to the pixel indicated by the motion vector.
- FIG. 6 is an exemplary diagram for describing a process of selecting a motion vector according to an embodiment of the present invention.
- 6A illustrates a process of calculating an encoding cost for a motion vector determined according to a combination of motion vector resolutions selected by the encoder 140
- 6B illustrates a motion vector selected by the encoder 140 among available motion vector resolutions.
- a process of calculating a coding cost for a motion vector determined by using template matching at a motion vector resolution not included in the resolution combination is shown.
- the encoding cost calculated by the method shown in 6A and 6B can be calculated using Equations 7 and 8, respectively.
- Equation 7 and Equation 8 Represents the current template, which represents adjacent pixels in the current block, Is a motion vector determined according to the motion vector resolution selected by the resolution combination determiner 420.
- Represents a reference template indicating adjacent pixels of the reference block indicated by Indicates the number of pixels in the current template and the reference template.
- the distortion cost is taken as an encoding cost, but the encoding cost is not necessarily limited thereto and may be calculated in various ways.
- the predictor 110 Since the motion vector having a small SAD among the SADs calculated using Equations 7 and 8 has better coding efficiency, the predictor 110 outputs the predicted block by compensating for the motion of the block using the corresponding motion vector. do. In this case, the predictor 110 may select a motion vector for each block in the coding unit. Therefore, the predictor 110 may output a predicted block whose motion is compensated using the estimated motion vector only when the selected motion vector for each block is a motion vector additionally estimated using template matching. If a motion vector determined according to a combination of motion vector resolutions is selected, a prediction block is not additionally generated.
- additional information or any additional information for additionally encoding or identifying a motion vector that is estimated to be a motion vector resolution that is not included in the selected motion vector resolution combination among the available motion vector resolutions It is not necessary to encode information indicating whether the video encoded data encoded using the motion vector is included in the bitstream. This is because the image decoding apparatus may perform the same process as described with reference to FIGS. 5 and 6 in the same manner as the image encoding apparatus 100.
- FIG. 7 is a flowchart illustrating a motion vector encoding method according to an embodiment of the present invention.
- the motion vector encoder 320 calculates an encoding cost according to a motion vector resolution for each combination of a plurality of motion vector resolutions including at least one motion vector resolution (In operation S710, a combination of motion vector resolutions is selected using a coding cost calculated for each combination of motion vector resolutions (S720), and motion vector encoded data obtained by encoding a motion vector determined according to the selected combination of motion vector resolutions is output. (S730).
- the motion vector resolution may include at least one of resolution in integer pixel units, resolution in 1/2 pixel units, resolution in 1/4 pixel units, and resolution in 1/8 pixel units.
- the motion vector encoder 320 may further output resolution combination index data by encoding a resolution combination index indicating a combination of the selected motion vector resolutions.
- the motion vector encoder 320 may select a combination of motion vector resolutions for each coding unit including one or more of blocks, slices, pictures, and picture groups, and may calculate a combination of motion costs calculated by the combination of motion vector resolutions.
- a combination of motion vector resolutions having a small encoding cost can be selected as a combination of motion vector resolutions.
- FIG. 8 is a flowchart illustrating an image encoding method according to an embodiment of the present invention.
- the image encoding apparatus 100 determines a motion vector of an image according to a motion vector resolution for each combination of a plurality of motion vector resolutions including at least one motion vector resolution.
- a predicted image of the image is generated using the determined motion vector (S820)
- a residual image is generated by subtracting the image and the predicted image (S830)
- the residual image is converted and quantized (S840).
- encoding the quantized residual image to generate image encoded data for each combination of the motion vector resolutions (S850), calculating the encoding cost of the image encoded data for each combination of the motion vector resolutions (S860), and performing the image for each combination of the motion vector resolutions.
- a combination of motion vector resolutions is selected using the encoding cost of the encoded data (S870).
- a bitstream including encoded image coded data is generated using a motion vector determined according to the motion vector resolution according to the combination (S880).
- the image encoding apparatus 100 estimates a motion vector having a motion vector resolution that is not included in the selected combination of motion vector resolutions among the available motion vector resolutions, and uses the motion vector having the estimated motion vector resolution to obtain an image.
- the bitstream including the encoded image coded data may be generated by predictive encoding.
- the image encoding apparatus 100 may estimate a motion vector having a motion vector resolution not included in the selected motion vector resolution combination by using template matching, and according to the motion vector determined according to the selected motion vector resolution combination.
- a bitstream including encoded image encoded data may be generated.
- FIG. 9 is a flowchart for explaining another example of implementing an image encoding method according to an embodiment of the present invention.
- Steps S910 to S970 are the same as or similar to steps S810 to S870 described above with reference to FIG. 8, and thus a detailed description thereof will be omitted.
- the image encoding apparatus 100 based on the motion vector determined according to the combination of the motion vector resolution and the motion vector resolution that are not included in the combination of the motion vector resolution selected in step S970 among the available motion vector resolutions.
- a search area for motion estimation is determined (S980). For example, if a combination of motion vector resolutions including motion vector resolutions in integer, 1/2, and 1/8 pixel units is selected in step S870, the combination of motion vector resolutions selected from the available motion vector resolutions is not included.
- the motion vector resolution is a motion vector resolution in units of 1/4 pixels. In this case, the image encoding apparatus 100 limits and sets the search region for additional motion estimation to the peripheral region of the motion vector determined according to the combination of the selected motion vector resolutions.
- the image encoding apparatus 100 performs motion estimation using template matching at a motion vector resolution that is not included in the combination of the motion vector resolutions in the search area determined in operation S980, thereby causing the motion vector not included in the combination of the motion vector resolutions.
- a motion vector of resolution is determined (S990). That is, as described above with reference to FIG. 5, the image encoding apparatus 100 further estimates the motion of each block in the slice at a 1/4 pixel unit by using the template matching to further estimate the motion of each block in the slice. Determines the motion vector of the motion vector resolution. In this case, as described above with reference to FIG.
- the image encoding apparatus 100 does not include a motion vector determined according to a combination of the motion vector resolution selected in step S970 and a motion vector resolution using template matching in step S990.
- a bitstream including image coded data encoded using a motion vector having high coding efficiency among motion vectors determined by performing motion estimation at a motion vector resolution may be output.
- each step described above with reference to FIGS. 7 to 9 is not necessarily all performed, and some steps may be selectively omitted or added according to an implementation method or a need.
- the order of each step is not necessarily determined as shown, and the order of some or all of the steps may be changed or even performed in parallel.
- FIG. 10 is a block diagram schematically illustrating an image decoding apparatus according to an embodiment of the present invention.
- the image decoding apparatus 1000 may include a decoder 1010, an inverse quantizer and an inverse converter 1020, a predictor 1030, an adder 1040, and a reference picture memory 1050. It can be configured to include.
- the decoder 1010 decodes the motion vector encoded data extracted from the bitstream according to the combination of the motion vector resolution, which is recovered by decoding the resolution combination index data extracted from the bitstream, and restores the motion vector, and is extracted from the bitstream.
- the encoded and decoded residual images are reconstructed by decoding the image encoded data. That is, the decoder 1010 extracts and decodes the resolution combination index data, the motion vector coded data, and the image coded data from the bitstream, respectively, to reconstruct the resolution combination index, the motion vector, and the transformed and quantized residual images.
- the decoder 1010 decodes the motion vector encoded data by using a code table identified by the combination of the motion vector resolutions indicated by the reconstructed resolution combination index.
- the decoder 1010 may decode by using an encoding technique such as entropy encoding.
- the decoder 1010 may reversely decode the encoder 140 described above with reference to FIG. 1 to decode.
- the inverse quantizer and inverse transformer 1020 inverse quantizes and inverse transforms the transformed and quantized residual image to reconstruct the residual image. That is, the inverse quantizer and inverse transformer 1020 inverse quantizes and inversely transforms the quantized transform coefficients of the transformed and quantized residual image transmitted by the decoder 1010 to reconstruct the residual image having the residual signal. In this case, the inverse quantizer and the inverse transformer 1020 may perform inverse quantization and inverse transformation by performing the transformation and quantization of the converter and quantizer 130 described above with reference to FIG. 1.
- the reconstructed residual image is an image in a predetermined coding unit including several residual blocks, and the image of the coding unit may be various images such as a block, a slice, a picture, a picture group, and the like.
- the predictor 1030 generates a predicted image of the image by using the reconstructed motion vector. That is, the predictor 1030 generates a prediction block by compensating for the motion of blocks to be encoded by using the motion vector reconstructed by the decoder 1010.
- the prediction blocks are gathered in a predetermined coding unit to form a prediction image. .
- the predictor 1030 is not a motion vector reconstructed by the decoder 1010, but a motion not included in the combination of motion vector resolutions indicated by the resolution combination index reconstructed by the decoder 1010 among the available motion vector resolutions.
- the motion vector may be estimated at the vector resolution, and the prediction image may be generated using the motion vector having the motion vector resolution which is not included in the estimated motion vector resolution combination.
- the predictor 1030 may use a coding cost calculated using a motion vector estimated by a motion vector resolution not included in a combination of a coding cost and a motion vector resolution calculated using the motion vector reconstructed by the decoder 1010.
- the prediction image may be generated using a motion vector having a small encoding cost. In this case, the predictor 1030 may estimate a motion vector having a motion vector resolution that is not included in the combination of the motion vector resolutions using template matching.
- the adder 1040 reconstructs the image by adding the residual image and the predicted image. That is, the adder 1040 reconstructs the image by adding the residual image reconstructed by the inverse quantizer and the inverse transformer 1020 and the predicted image generated by the predictor 1030.
- the image reconstructed by the adder 1040 may be accumulated in units of pictures and output as a reconstructed image.
- the image reconstructed by the adder 1040 may be stored in the reference picture memory 1050 to be used by the predictor 1030 to predict the next image.
- the image decoding apparatus 1000 may include an intra predictor for intra prediction, a deblocking filter for deblocking filtering the reconstructed current block, and the like. It may further comprise.
- FIG. 11 is a block diagram schematically illustrating a decoder according to an embodiment of the present invention.
- the decoder 1010 may include a motion vector decoder 1110 and a predictive residual decoder 1120.
- the motion vector decoder 1110 reconstructs the motion vector by decoding the motion vector encoded data extracted from the bitstream according to the combination of the motion vector resolution, which is recovered by decoding the resolution combination index data extracted from the bitstream.
- the motion vector decoder 1110 will be described in detail with reference to FIG. 12.
- the prediction residual decoder 1120 decodes the image coded data extracted from the bitstream to reconstruct the transformed and quantized residual image.
- FIG. 12 is a block diagram schematically illustrating a motion vector decoding apparatus according to an embodiment of the present invention.
- the motion vector decoding apparatus may be implemented as the motion vector decoder 1110 in the decoder 1010 described above with reference to FIG. 11.
- the motion vector decoding apparatus is called a motion vector decoder 1110.
- the motion vector decoder 1110 may include a resolution combination reconstructor 1210 and a motion vector reconstructor 1220.
- the resolution combination reconstructor 1210 decodes the resolution combination index data extracted from the bitstream to reconstruct the combination of the motion vector resolutions. That is, the resolution combination reconstructor 1210 extracts and decodes the resolution combination index data from the bitstream to restore the resolution combination index, and restores the combination of the motion vector resolutions indicated by the reconstructed resolution combination index.
- the resolution combination reconstructor 1210 may extract resolution limited index data from a header of a predetermined coding unit, such as a block header, a slice header, and a picture header of the bitstream.
- the reconstructed motion vector resolution combination has information on the combination of motion vector resolutions for all blocks in the image of a predetermined coding unit. For example, assuming that the combination of the motion vector resolutions is the fifth combination of the motion vector resolutions shown in Table 2, the motion vectors of each block in the predetermined coding unit have only the motion vector resolution in integer pixels or 1/2 pixel units. .
- the motion vector reconstructor 1220 reconstructs the motion vector by decoding motion vector encoded data extracted from the bitstream according to the combination of the reconstructed motion vector resolution. That is, the motion vector reconstructor 1220 extracts and decodes motion vector encoded data from the bitstream to reconstruct motion vectors of all blocks in a predetermined coding unit.
- the motion vector resolution reconstructed by the resolution combination reconstructor 1210 is obtained.
- the motion vector encoded data may be decoded by using a code table identified by a combination of. For example, assuming that the combination of the reconstructed motion vector resolutions is the first combination of the motion vector resolutions, the motion vector may be reconstructed by decoding the motion vector encoded data using a code table exemplarily shown in Table 3. .
- the motion vector decompressor 1320 has a different code table according to the combination of motion vector resolutions and stores them in advance, and the code table is previously agreed with the motion vector encoder 430 or the image encoding apparatus 100. The same table is created.
- FIG. 13 is a flowchart illustrating a motion vector decoding method according to an embodiment of the present invention.
- the motion vector decoder 1110 decodes the resolution combination index data extracted from the bitstream to restore the combination of the motion vector resolutions (S1310), and the reconstructed motion.
- the motion vector is reconstructed by decoding the motion vector encoded data extracted from the bitstream according to the combination of the vector resolutions (S1320).
- the motion vector decoder 1110 may decode the motion vector encoded data using another code table according to the combination of the motion vector resolutions restored in operation S1310.
- FIG. 14 is a flowchart illustrating an image decoding method according to an embodiment of the present invention.
- the image decoding apparatus 1000 encodes a motion vector that is extracted from a bitstream according to a combination of motion vector resolutions that are reconstructed by decoding resolution combination index data extracted from a bitstream. Decode the data to restore the motion vector (S1410), decode the image coded data extracted from the bitstream to restore the transformed and quantized residual image (S1420), and inverse quantization and inverse transform the transformed and quantized residual image
- the residual image is reconstructed (S1430), a predicted image of the image is generated using the reconstructed motion vector (S1440), and the image is reconstructed by adding the residual image and the predicted image (S1450).
- the image decoding apparatus 1000 may generate a prediction image by using the motion vector reconstructed in operation S1410 as it is, but is not included in the combination of the motion vector resolution reconstructed in operation S1410 among the available motion vector resolutions.
- a prediction image may be generated using a motion vector having a small encoding cost.
- the image decoding apparatus 1000 may estimate the motion vector having the motion vector resolution which is not included in the combination of the motion vector resolutions by using the template matching.
- each step described above with reference to FIGS. 13 and 14 is not necessarily all performed, and some steps may be selectively omitted or added.
- the order of each step is not necessarily determined as shown, and the order of some or all of the steps may be changed or even performed in parallel.
- a combination of the resolution of the motion vector resolution is determined and the combination of the resolution of the motion vector is determined for the blocks in the image of the predetermined coding unit such as a slice or the like. Since the motion vector can be encoded by using a code table suitable for, the amount of bits required for encoding the motion vector can be reduced, and as a result, the compression efficiency of the image can be improved.
- both the video encoding apparatus 100 and the video decoding apparatus 1000 may perform the same. Since an additional motion estimation may be performed at a motion vector resolution not included in the combination of motion vector resolutions, the image may be encoded using motion vectors having various motion vector resolutions, thereby increasing the accuracy of prediction and suppressing generation of residual signals. In addition, since there is no need to additionally encode a motion vector having a motion vector resolution determined through additional motion estimation, the compression efficiency of the image may be further improved.
- the motion vector encoding apparatus and the motion vector decoding apparatus have been described as being implemented as independent apparatuses, the motion vector encoding apparatus and the motion vector decoding apparatus are in one image encoding / decoding apparatus. It may be implemented. Such an image encoding / decoding apparatus may not only encode an image signal and transmit the encoded image signal to another image processing apparatus, but also may receive the encoded bitstream from another image processing apparatus and restore and reproduce the image signal.
- the present invention is applied to a field, and is applied to a field of image compression processing for encoding or decoding a video and encoding or decoding a motion vector therefor to adaptively select a combination of resolutions of an efficient motion vector. Compression efficiency can be improved by determining and encoding a motion vector based on the motion vector.
- the combination of resolutions of the motion vectors is adaptively selected and the motion vectors are determined and encoded accordingly, the motion vector resolution is determined based on the bitstream. It is a very useful invention to generate the effect of improving the reconstruction efficiency of the image by correspondingly restoring the combination and restoring the motion vector.
Abstract
Description
Claims (32)
- 영상 부/복호화 장치에 있어서,적어도 하나 이상의 움직임 벡터 해상도를 포함하는 복수 개의 움직임 벡터 해상도의 조합별로 움직임 벡터 해상도에 따른 부호화 비용을 계산하며, 상기 움직임 벡터 해상도의 조합별로 계산된 부호화 비용을 이용하여 하나의 움직임 벡터 해상도의 조합을 선택하고, 상기 선택된 움직임 벡터 해상도의 조합에 따라 결정되는 움직임 벡터가 부호화된 움직임 벡터 부호화 데이터를 비트스트림으로 출력하는 움직임 벡터 부호화부; 및상기 비트스트림으로부터 추출되는 해상도 조합 색인 데이터를 복호화하여 움직임 벡터 해상도의 조합을 복원하며, 상기 복원되는 움직임 벡터 해상도의 조합에 따라 상기 비트스트림으로부터 추출되는 상기 움직임 벡터 부호화 데이터를 복호화하여 움직임 벡터를 복원하는 움직임 벡터 복호화부를 포함하는 것을 특징으로 하는 영상 부/복호화 장치.
- 움직임 벡터를 부호화하는 장치에 있어서,적어도 하나 이상의 움직임 벡터 해상도를 포함하는 복수 개의 움직임 벡터 해상도의 조합별로 움직임 벡터 해상도에 따른 부호화 비용을 계산하는 부호화 비용 계산기;상기 움직임 벡터 해상도의 조합별로 계산된 부호화 비용을 이용하여 하나의 움직임 벡터 해상도의 조합을 선택하는 해상도 조합 결정기; 및상기 선택된 움직임 벡터 해상도의 조합에 따라 결정되는 움직임 벡터가 부호화된 움직임 벡터 부호화 데이터를 출력하는 움직임 정보 부호화기를 포함하는 것을 특징으로 하는 움직임 벡터 부호화 장치.
- 제 2 항에 있어서, 상기 움직임 정보 부호화기는,상기 선택된 움직임 벡터 해상도의 조합을 나타내는 해상도 조합 색인을 부호화하여 해상도 조합 색인 데이터를 출력하는 것을 특징으로 하는 움직임 벡터 부호화 장치.
- 제 2 항에 있어서, 상기 해상도 조합 결정기는,블록, 슬라이스, 픽처 및 픽처 그룹 중 하나 이상을 포함하는 부호화 단위마다 상기 움직임 벡터 해상도의 조합을 선택하는 것을 특징으로 하는 움직임 벡터 부호화 장치.
- 제 2 항에 있어서, 상기 움직임 벡터 해상도는,정수 화소 단위의 해상도, 1/2 화소 단위의 해상도, 1/4 화소 단위의 해상도 및 1/8 화소 단위의 해상도 중 하나 이상을 포함하는 것을 특징으로 하는 움직임 벡터 부호화 장치.
- 제 2 항에 있어서, 상기 해상도 조합 결정기는,상기 움직임 벡터 해상도의 조합별로 계산된 부호화 비용 중 가장 작은 부호화 비용을 가지는 움직임 벡터 해상도의 조합을 상기 움직임 벡터 해상도의 조합으로서 선택하는 것을 특징으로 하는 움직임 벡터 부호화 장치.
- 제 2 항에 있어서, 상기 부호화 비용 계산기는,상기 움직임 벡터 해상도의 조합별로 다른 코드 테이블을 이용하여 움직임 벡터를 부호화하여 상기 부호화 비용을 계산하는 것을 특징으로 하는 움직임 벡터 부호화 장치.
- 영상을 부호화하는 장치에 있어서,적어도 하나 이상의 움직임 벡터 해상도를 포함하는 복수 개의 움직임 벡터 해상도의 조합별 움직임 벡터 해상도에 따라 상기 영상의 움직임 벡터를 결정하고 상기 결정되는 움직임 벡터를 이용하여 상기 영상의 예측 영상을 생성하는 예측기;상기 영상과 상기 예측 영상을 감산하여 잔여 영상을 생성하는 감산기;상기 잔여 영상을 변환 및 양자화하는 변환기 및 양자화기; 및상기 변환 및 양자화된 잔여 영상을 부호화하여 움직임 벡터 해상도의 조합별 영상 부호화 데이터를 생성하고, 상기 움직임 벡터 해상도의 조합별 영상 부호화 데이터의 부호화 비용을 계산하며, 상기 움직임 벡터 해상도의 조합별 영상 부호화 데이터의 부호화 비용을 이용하여 움직임 벡터 해상도의 조합을 선택하며, 상기 선택된 움직임 벡터 해상도의 조합에 따른 움직임 벡터 해상도에 따라 결정되는 움직임 벡터를 이용하여 부호화된 영상 부호화 데이터를 출력하는 부호화기를 포함하는 것을 특징으로 하는 영상 부호화 장치.
- 제 8 항에 있어서, 상기 부호화기는,이용 가능한 움직임 벡터 해상도 중에서 상기 선택된 움직임 벡터 해상도의 조합에 포함되지 않은 움직임 벡터 해상도의 움직임 벡터를 추정하며, 상기 추정된 움직임 벡터 해상도의 움직임 벡터를 이용하여 상기 영상을 예측 부호화하여 부호화된 영상 부호화 데이터를 포함하는 비트스트림을 생성하는 것을 특징으로 하는 영상 부호화 장치.
- 제 9 항에 있어서, 상기 부호화기는,템플릿 매칭을 이용하여 상기 선택된 움직임 벡터 해상도의 조합에 포함되지 않은 움직임 벡터 해상도의 움직임 벡터를 추정하는 것을 특징으로 하는 영상 부호화 장치.
- 제 9 항에 있어서, 상기 부호화기는,상기 선택된 움직임 벡터 해상도의 조합에 따라 결정되는 움직임 벡터에 따라 상기 영상을 예측 부호화하는 데 소요되는 부호화 비용과 상기 선택된 움직임 벡터 해상도의 조합에 포함되지 않은 움직임 벡터 해상도의 움직임 벡터에 따라 상기 영상을 예측 부호화하는 데 소요되는 부호화 비용 중 작은 부호화 비용을 가지는 움직임 벡터를 이용하여 부호화된 영상 부호화 데이터를 포함하는 비트스트림을 생성하는 것을 특징으로 하는 영상 부호화 장치.
- 움직임 벡터를 복호화하는 장치에 있어서,비트스트림으로부터 추출되는 해상도 조합 색인 데이터를 복호화하여 움직임 벡터 해상도의 조합을 복원하는 해상도 조합 복원기; 및상기 복원되는 움직임 벡터 해상도의 조합에 따라 비트스트림으로부터 추출되는 움직임 벡터 부호화 데이터를 복호화하여 움직임 벡터를 복원하는 움직임 벡터 복원기를 포함하는 것을 특징으로 하는 움직임 벡터 복호화 장치.
- 제 12 항에 있어서, 상기 움직임 벡터 복원기는,상기 복원되는 움직임 벡터 해상도의 조합에 따라 다른 코드 테이블을 이용하여 상기 움직임 벡터 부호화 데이터를 복호화하는 것을 특징으로 하는 움직임 벡터 복호화 장치.
- 영상을 복호화하는 장치에 있어서,비트스트림으로부터 추출되는 해상도 조합 색인 데이터를 복호화하여 복원되는 움직임 벡터 해상도의 조합에 따라 상기 비트스트림으로부터 추출되는 움직임 벡터 부호화 데이터를 복호화하여 움직임 벡터를 복원하며, 상기 비트스트림으로부터 추출되는 영상 부호화 데이터를 복호화하여 변환 및 양자화된 잔여 영상을 복원하는 복호화기;상기 변환 및 양자화된 잔여 영상을 역 양자화 및 역 변환하여 잔여 영상을 복원하는 역 양자화기 및 역 변환기;상기 복원되는 움직임 벡터를 이용하여 상기 영상의 예측 영상을 생성하는 예측기; 및상기 잔여 영상과 상기 예측 영상을 가산하여 상기 영상을 복원하는 가산기를 포함하는 것을 특징으로 하는 영상 복호화 장치.
- 제 14 항에 있어서, 상기 복호화기는,상기 비트스트림으로부터 추출되는 해상도 조합 색인 데이터를 복호화하여 복원되는 움직임 벡터 해상도의 조합에 따라 상기 비트스트림으로부터 추출되는 움직임 벡터 부호화 데이터를 복호화하여 움직임 벡터를 복원하며, 이용 가능한 움직임 벡터 해상도 중 상기 복원되는 움직임 벡터 해상도의 조합에 포함되지 않은 움직임 벡터 해상도의 움직임 벡터를 추정하고, 상기 복원되는 움직임 벡터를 이용하여 계산되는 부호화 비용과 상기 추정되는 움직임 벡터를 이용하여 계산되는 부호화 비용 중 작은 부호화 비용을 가지는 움직임 벡터를 움직임 벡터로서 복원하는 것을 특징으로 하는 영상 복호화 장치.
- 제 15 항에 있어서, 상기 복호화기는,템플릿 매칭을 이용하여 상기 복원되는 움직임 벡터 해상도의 조합에 포함되지 않은 움직임 벡터 해상도의 움직임 벡터를 추정하는 것을 특징으로 하는 영상 복호화 장치.
- 영상 부/복호화 방법에 있어서,적어도 하나 이상의 움직임 벡터 해상도를 포함하는 복수 개의 움직임 벡터 해상도의 조합별로 움직임 벡터 해상도에 따른 부호화 비용을 계산하며, 상기 움직임 벡터 해상도의 조합별로 계산된 부호화 비용을 이용하여 하나의 움직임 벡터 해상도의 조합을 선택하고, 상기 선택된 움직임 벡터 해상도의 조합에 따라 결정되는 움직임 벡터가 부호화된 움직임 벡터 부호화 데이터를 비트스트림으로 출력하는 단계; 및상기 비트스트림으로부터 추출되는 해상도 조합 색인 데이터를 복호화하여 움직임 벡터 해상도의 조합을 복원하며, 상기 복원되는 움직임 벡터 해상도의 조합에 따라 상기 비트스트림으로부터 추출되는 상기 움직임 벡터 부호화 데이터를 복호화하여 움직임 벡터를 복원하는 단계를 포함하는 것을 특징으로 하는 영상 부/복호화 방법.
- 영상의 움직임 벡터를 부호화하는 방법에 있어서,적어도 하나 이상의 움직임 벡터 해상도를 포함하는 복수 개의 움직임 벡터 해상도의 조합별 움직임 벡터 해상도에 따른 부호화 비용을 계산하는 단계;상기 움직임 벡터 해상도의 조합별로 계산된 부호화 비용을 이용하여 움직임 벡터 해상도의 조합을 선택하는 단계; 및상기 선택된 움직임 벡터 해상도의 조합에 따라 결정되는 움직임 벡터가 부호화된 움직임 벡터 부호화 데이터를 출력하는 단계를 포함하는 것을 특징으로 하는 움직임 정보 부호화 방법.
- 제 18 항에 있어서, 상기 움직임 벡터 부호화 방법은,상기 선택된 움직임 벡터 해상도의 조합을 나타내는 해상도 조합 색인을 부호화하여 해상도 조합 색인 데이터를 출력하는 단계를 추가로 포함하는 것을 특징으로 하는 움직임 벡터 부호화 방법.
- 제 18 항에 있어서, 상기 움직임 벡터 해상도의 조합을 선택하는 단계는,블록, 슬라이스, 픽처 및 픽처 그룹 중 하나 이상을 포함하는 부호화 단위마다 상기 움직임 벡터 해상도의 조합을 선택하는 것을 특징으로 하는 움직임 벡터 부호화 방법.
- 제 18 항에 있어서, 상기 움직임 벡터 해상도는,정수 화소 단위의 해상도, 1/2 화소 단위의 해상도, 1/4 화소 단위의 해상도 및 1/8 화소 단위의 해상도 중 하나 이상을 포함하는 것을 특징으로 하는 움직임 벡터 부호화 방법.
- 제 18 항에 있어서, 상기 움직임 벡터 해상도의 조합을 선택하는 단계는,상기 움직임 벡터 해상도의 조합별로 계산된 부호화 비용 중 가장 작은 부호화 비용을 가지는 움직임 벡터 해상도의 조합을 상기 움직임 벡터 해상도의 조합으로서 선택하는 것을 특징으로 하는 움직임 벡터 부호화 방법.
- 제 18 항에 있어서, 상기 부호화 비용을 계산하는 단계는,상기 움직임 벡터 해상도의 조합별로 다른 코드 테이블을 이용하여 움직임 벡터를 부호화하여 상기 부호화 비용을 계산하는 것을 특징으로 하는 움직임 벡터 부호화 방법.
- 영상을 부호화하는 방법에 있어서,적어도 하나 이상의 움직임 벡터 해상도를 포함하는 복수 개의 움직임 벡터 해상도의 조합별 움직임 벡터 해상도에 따라 상기 영상의 움직임 벡터를 결정하는 단계;상기 결정되는 움직임 벡터를 이용하여 상기 영상의 예측 영상을 생성하는 단계;상기 영상과 상기 예측 영상을 감산하여 잔여 영상을 생성하는 단계;상기 잔여 영상을 변환 및 양자화하는 단계;상기 변환 및 양자화된 잔여 영상을 부호화하여 움직임 벡터 해상도의 조합별 영상 부호화 데이터를 생성하는 단계;상기 움직임 벡터 해상도의 조합별 영상 부호화 데이터의 부호화 비용을 계산하는 단계;상기 움직임 벡터 해상도의 조합별 영상 부호화 데이터의 부호화 비용을 이용하여 움직임 벡터 해상도의 조합을 선택하는 단계; 및상기 선택된 움직임 벡터 해상도의 조합에 따른 움직임 벡터 해상도에 따라 결정되는 움직임 벡터를 이용하여 부호화된 영상 부호화 데이터를 포함하는 비트스트림을 생성하는 단계를 포함하는 것을 특징으로 하는 영상 부호화 방법.
- 제 24 항에 있어서, 상기 비트스트림을 생성하는 단계는,이용 가능한 움직임 벡터 해상도 중에서 상기 선택된 움직임 벡터 해상도의 조합에 포함되지 않은 움직임 벡터 해상도의 움직임 벡터를 추정하는 단계;상기 추정된 움직임 벡터 해상도의 움직임 벡터를 이용하여 상기 영상을 예측 부호화하여 부호화된 영상 부호화 데이터를 포함하는 비트스트림을 생성하는 단계를 포함하는 것을 특징으로 하는 영상 부호화 방법.
- 제 25 항에 있어서, 상기 움직임 벡터를 추정하는 단계는,템플릿 매칭을 이용하여 상기 선택된 움직임 벡터 해상도의 조합에 포함되지 않은 움직임 벡터 해상도의 움직임 벡터를 추정하는 것을 특징으로 하는 영상 부호화 방법.
- 제 25 항에 있어서, 상기 영상을 예측 부호화하여 부호화된 영상 부호화 데이터를 포함하는 비트스트림을 생성하는 단계는,상기 선택된 움직임 벡터 해상도의 조합에 따라 결정되는 움직임 벡터에 따라 상기 영상을 예측 부호화하는 데 소요되는 부호화 비용과 상기 선택된 움직임 벡터 해상도의 조합에 포함되지 않은 움직임 벡터 해상도의 움직임 벡터에 따라 상기 영상을 예측 부호화하는 데 소요되는 부호화 비용 중 작은 부호화 비용을 가지는 움직임 벡터를 이용하여 부호화된 영상 부호화 데이터를 포함하는 비트스트림을 생성하는 것을 특징으로 하는 영상 부호화 방법.
- 움직임 벡터를 복호화하는 방법에 있어서,비트스트림으로부터 추출되는 해상도 조합 색인 데이터를 복호화하여 움직임 벡터 해상도의 조합을 복원하는 단계; 및상기 복원되는 움직임 벡터 해상도의 조합에 따라 비트스트림으로부터 추출되는 움직임 벡터 부호화 데이터를 복호화하여 움직임 벡터를 복원하는 단계를 포함하는 것을 특징으로 하는 움직임 벡터 복호화 방법.
- 제 28 항에 있어서, 상기 움직임 벡터를 복원하는 단계는,상기 복원되는 움직임 벡터 해상도의 조합에 따라 다른 코드 테이블을 이용하여 상기 움직임 벡터 부호화 데이터를 복호화하는 것을 특징으로 하는 움직임 벡터 복호화 방법.
- 영상을 복호화하는 방법에 있어서,비트스트림으로부터 추출되는 해상도 조합 색인 데이터를 복호화하여 복원되는 움직임 벡터 해상도의 조합에 따라 상기 비트스트림으로부터 추출되는 움직임 벡터 부호화 데이터를 복호화하여 움직임 벡터를 복원하는 단계;상기 비트스트림으로부터 추출되는 영상 부호화 데이터를 복호화하여 변환 및 양자화된 잔여 영상을 복원하는 단계;상기 변환 및 양자화된 잔여 영상을 역 양자화 및 역 변환하여 잔여 영상을 복원하는 단계;상기 복원되는 움직임 벡터를 이용하여 상기 영상의 예측 영상을 생성하는 단계; 및상기 잔여 영상과 상기 예측 영상을 가산하여 상기 영상을 복원하는 단계를 포함하는 것을 특징으로 하는 영상 복호화 방법.
- 제 30 항에 있어서, 상기 움직임 벡터를 복원하는 단계는,비트스트림으로부터 추출되는 해상도 조합 색인 데이터를 복호화하여 복원되는 움직임 벡터 해상도의 조합에 따라 상기 비트스트림으로부터 추출되는 움직임 벡터 부호화 데이터를 복호화하여 움직임 벡터를 복원하는 단계;이용 가능한 움직임 벡터 해상도 중 상기 복원되는 움직임 벡터 해상도의 조합에 포함되지 않은 움직임 벡터 해상도의 움직임 벡터를 추정하는 단계;상기 복원되는 움직임 벡터를 이용하여 계산되는 부호화 비용과 상기 추정되는 움직임 벡터를 이용하여 계산되는 부호화 비용 중 작은 부호화 비용을 가지는 움직임 벡터를 움직임 벡터로서 복원하는 단계를 포함하는 것을 특징으로 하는 영상 복호화 방법.
- 제 31 항에 있어서, 상기 움직임 벡터를 추정하는 단계는,템플릿 매칭을 이용하여 상기 복원되는 움직임 벡터 해상도의 조합에 포함되지 않은 움직임 벡터 해상도의 움직임 벡터를 추정하는 것을 특징으로 하는 영상 복호화 방법.
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