QUALCOMM Incorporated
Rectangular block transform scaling

Abstract:

A device for decoding video data determines a quantization parameter (QP) for a block of transform coefficients, wherein the block of transform coefficients is a non-square, rectangular block; determines a value for (log.sub.2 (width)+log.sub.2 (height), wherein width represents a width of the block of transform coefficients and height represents a height of the block of transform coefficients; in response to the value not being divisible by 2, determines a modified QP for the block of transform coefficients based on the QP; inverse transforms the transform coefficients to determine a block of quantized residual samples; and dequantizes the quantized residual samples based on the modified QP to determine a block of residual samples.