VIDEO DECODER WITH REDUCED DYNAMIC RANGE TRANSFORM WITH INVERSE TRANSFORM CLIPPING
A method for decoding video includes receiving quantized coefficients representative of a block of video representative of a plurality of pixels. The quantized coefficients are dequantized based upon a function of a remainder. The dequantized coefficients are inverse transformed to determine a decoded residue.
1 . A method for decoding video comprising:
(a) receiving quantized coefficients representative of a block of video representative of a plurality of pixels;
(b) dequantizing said quantized coefficients;
(c) applying a modification to said dequantized coefficients based upon a first quantization parameter;
(d) inverse transforming in a first direction said dequanized coefficients;
(e) shifting said first direction transformed coefficients and clipping said shifted transformed coefficients;
(f) shifting said shifted coefficients and inverse transforming in a second direction to determine a decoded residue.
2 . The method of claim 1 wherein said dequantized coefficients are further modified as a result of an adjustment mechanism.
3 . The method of claim 2 wherein said adjustment mechanism is avariable dependent on transform size.
4 . The method of claim 2 wherein said adjustment mechanism is a function of at least one of a received quantization parameter and a transform size.
5 . The method of claim 1 wherein said shifting said first direction transformed coefficients is based upon the size of said block of video.
6 . The method of claim 1 wherein said shifting said shifted coefficients is based upon the size of said block of video.
7 . The method of claim 1 wherein said shifting said first direction transformed coefficients removes at least one least significant bit.
8 . The method of claim 7 wherein said shifting said shifted coefficients adds at least one least significant bit.
9 . The method of claim 1 wherein said first direction is a horizontal direction.
10 . The method of claim 1 wherein said second direction is a vertical direction.
11 . The method of claim 1 wherein said first direction is a vertical direction.