Video encoding method and device and decoding method and device
First Claim
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1. A video decoding method comprising:
- receiving a quantized transform block which has a predetermined size;
determining a scaling constant for scaling of transform coefficients included in the quantized transform block based on a quantization parameter;
scaling the transform coefficients by using the scaling constant; and
inverse-transforming the transform block that includes the scaled transform coefficients,wherein, where i denotes a remainder after the quantization parameter is divided by 6, the scaling constant for i=0 is 40, the scaling constant for i=1 is 45, the scaling constant for i=2 is 51, the scaling constant for i=3 is 57, the scaling constant for i=4 is 64, and the scaling constant for i=5 is 72.
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Abstract
A video encoding method, a video encoding apparatus, a video decoding method, and a video decoding apparatus, the video encoding method including producing a fast transform matrix based on a transform matrix which is used for frequency transformation on a predetermined-size block; producing a transformed block by transforming the predetermined-size block by using the fast transform matrix; and performing scaling with respect to the transformed block to correct a difference between the transform matrix used for the frequency transformation and the fast transform matrix.
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1 Claim
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1. A video decoding method comprising:
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receiving a quantized transform block which has a predetermined size; determining a scaling constant for scaling of transform coefficients included in the quantized transform block based on a quantization parameter; scaling the transform coefficients by using the scaling constant; and inverse-transforming the transform block that includes the scaled transform coefficients, wherein, where i denotes a remainder after the quantization parameter is divided by 6, the scaling constant for i=0 is 40, the scaling constant for i=1 is 45, the scaling constant for i=2 is 51, the scaling constant for i=3 is 57, the scaling constant for i=4 is 64, and the scaling constant for i=5 is 72.
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Specification