METHOD AND APPARATUS FOR IMAGE INTRA PREDICTION AND IMAGE DECODING METHOD AND APPARATUS USING THE SAME
First Claim
Patent Images
1. An image intra prediction method comprising:
- backing up values of boundary pixels adjacent to a block that is to be decoded;
correcting the values of the boundary pixels adjacent to the block that is to be decoded based on correlations between the boundary pixels adjacent to the block that is to be decoded and pixels adjacent to the boundary pixels, outside of the block that is to be decoded;
predicting the block that is to be decoded according to an intra mode, from among a plurality of intra modes, based on the corrected values of the boundary pixels; and
restoring the values of the boundary pixels from the backed up values of the boundary pixels.
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Abstract
An image intra prediction method and image intra prediction apparatus and a decoding apparatus and a decoding method using the image intra prediction method are provided. The image intra prediction method includes: backing up boundary pixel values adjacent to a block that is to be decoded; correcting the boundary pixel values adjacent to the block that is to be decoded based on correlations between the boundary pixels and pixels adjacent to the boundary pixels; predicting a block that is to be decoded according to an intra mode, from among a plurality of intra modes, based on the corrected boundary pixel values; and restoring the boundary pixel values from the backed-up values.
31 Citations
19 Claims
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1. An image intra prediction method comprising:
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backing up values of boundary pixels adjacent to a block that is to be decoded; correcting the values of the boundary pixels adjacent to the block that is to be decoded based on correlations between the boundary pixels adjacent to the block that is to be decoded and pixels adjacent to the boundary pixels, outside of the block that is to be decoded; predicting the block that is to be decoded according to an intra mode, from among a plurality of intra modes, based on the corrected values of the boundary pixels; and restoring the values of the boundary pixels from the backed up values of the boundary pixels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 17)
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11. An image decoding method comprising:
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generating residual block information, a motion vector (MV), and prediction mode information by entropy-decoding a bit stream; extracting residual block coefficients by inversely quantizing the generated residual block information; down-scaling the generated residual block coefficients; performing intra prediction scaled based on corrected values of boundary pixels adjacent to a block that is to be decoded, corrected by using correlations between the boundary pixels and pixels adjacent to the boundary pixels, outside of the block that is to be decoded; and generating an image signal reconstructed by adding a residual signal generated by the down-scaling to an intra prediction signal generated by the performing the intra prediction. - View Dependent Claims (12, 18)
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13. An image intra prediction apparatus comprising:
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an image backup unit which backs up values of boundary pixels adjacent to a block that is to be decoded; an extrapolation unit which corrects the values of the boundary pixels adjacent to the block that is to be decoded based on correlations between the boundary pixels adjacent to the block that is to be decoded and pixels adjacent to the boundary pixels, outside of the block that is to be decoded; an interpolation unit which predicts a block that is to be decoded according to an intra mode, from among a plurality of intra modes, based on the corrected values of the boundary pixels; and an image restoration unit which replaces the corrected values of the boundary pixels with the backed up values of the boundary pixels.
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14. An image decoding apparatus comprising:
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an entropy decoding unit which generates residual block information, a motion vector (MV), and prediction mode information by entropy-decoding a bit stream; an inverse-quantization unit which extracts residual block coefficients by inversely quantizing the residual block information generated by the entropy decoding unit; a residual down-sizing unit which down-scales the generated residual block coefficients generated by the inverse-quantization unit; an image prediction unit which performs intra prediction scaled based on values of boundary pixels adjacent to a block that is to be decoded corrected by using correlations between the boundary pixels and pixels adjacent to the boundary pixels, outside of the block that is to be decoded; and an adding unit which reconstructs an image signal by adding a residual signal generated by the residual down-sizing unit to an intra prediction signal generated by the image prediction unit. - View Dependent Claims (15)
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16. An image intra prediction method comprising:
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obtaining corrected values of boundary pixels adjacent to a block that is to be decoded, the corrected values being based on correlations between the boundary pixels and pixels adjacent to the boundary pixels, outside of the block that is to be decoded; and predicting the block that is to be decoded according to an intra mode, from among a plurality of intra modes, based on the obtained corrected values. - View Dependent Claims (19)
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Specification