| 摘要 |
The present invention relates to a method of decoding a bitstream, the method comprising: (a) determining a quantization parameter from quantization data in the bitstream; (b) generating a chrominance scalar that: (i) equals 8 if the quantization parameter has any of values 1 through 4; (ii) equals (the quantization parameter +13)/2 if the quantization parameter has any of values 5 through 24, inclusive of the values 5 and 24; and (iii) equals the quantization parameter minus 6 if the quantization parameter has any of values 25 through 31; (c) inverse quantizing, using the chrominance scalar, a DC coefficient of a chrominance block to yield an inverse quantized DC coefficient; and (d) transforming data of the chrominance block, including the inverse quantized DC coefficient, according to an inverse discrete cosine transform. |
