METHOD AND APPARATUS FOR ENCODING AND DECODING IMAGE USING MODIFICATION OF RESIDUAL BLOCK
First Claim
Patent Images
1. A method of encoding an image, comprising:
- generating a predicted block of a current block, and subtracting the predicted block from the current block to generate a residual block of the current block;
generating information for increasing a spatial correlation among residual values included in the residual block based on the predicted block, and transforming the residual block based on the information; and
performing discrete cosine transformation (DCT) on a part of the transformed residual block based on the information.
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Abstract
Provided are a method and apparatus for encoding and decoding an image. In the encoding method, a residual block of a current block is transformed using a predicted block of the current block so as to increase the spatial correlation among residual values, and DCT is performed on the transformed residual block, thus improving the efficiency of transforming a block having a region that is difficult to precisely predict.
30 Citations
21 Claims
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1. A method of encoding an image, comprising:
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generating a predicted block of a current block, and subtracting the predicted block from the current block to generate a residual block of the current block; generating information for increasing a spatial correlation among residual values included in the residual block based on the predicted block, and transforming the residual block based on the information; and performing discrete cosine transformation (DCT) on a part of the transformed residual block based on the information. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for encoding an image, the apparatus comprising:
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a prediction unit which generates a predicted block of a current block; a subtraction unit which generates a residual block of the current block by subtracting the predicted block from the current block; a pre-processor which generates information for increasing the spatial correlation among values of residuals included in the residual block based on the predicted block, and transforming the residual block based on the information; and a transformation unit which performs discrete cosine transformation (DCT) on a part of the transformed residual block based on the information. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method of decoding an image, the method comprising:
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generating a predicted block of a current block, and information for increasing the spatial correlation among residual values included in a residual block of the current block based on the predicted block; performing inverse discrete cosine transformation (DCT) on a part of DCT coefficients of the residual block, based on the information; rearranging the residual values of the residual block which are obtained by the performing inverse DCT, based on the information; and combining the rearranged residual block and the predicted block to restore the current block. - View Dependent Claims (14, 15, 16, 21)
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17. An apparatus for decoding an image, the apparatus comprising:
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a prediction unit which generates a predicted block of a current block; a pre-processor which generates information for increasing a spatial correlation among values of residuals included in a residual block of the current block, based on the predicted block; an inverse transformation unit which performs inverse discrete cosine transformation (DCT) on a part of DCT coefficients of the residual block, based on the information; and an addition unit which rearranges the residual values of the residual block which are obtained by performing inverse DCT based on the information, and combines the rearranged residual block and the predicted block to restore the current block. - View Dependent Claims (18, 19, 20)
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Specification