Patent ID: 9185422
Filing Date: 2015-11-10
Classification: H04N

Abstract:
1. A method of coding a video signal, the method comprising: storing, in a video coding device, a plurality of pre-calculated constant values, wherein each of the plurality of pre-calculated constant values indicates a variable localized bit-depth increase associated with one of a plurality of different transform sizes associated with video coding, and wherein each of the plurality of pre-calculated constant values is pre-calculated based on an input bit-depth value of the video signal, a transform bit-depth value associated with the one of the plurality of different transform sizes, and a transform bit-precision value associated with the one of the plurality of different transform sizes; selecting a constant value from the plurality of pre-calculated constant values based on a size of a fixed-point transform in the video coding device; and applying, at the fixed-point transform in the video coding device, the variable localized bit-depth increase indicated by the selected constant value by left-shifting a transform input signal by a number of bits equal to the constant value before the fixed-point transform, and right-shifting a transform output signal by a number of bits equal to the constant value after the fixed-point transform.