Patent ID: 9253491
Filing Date: 2016-02-02
CPC Classification: H04N

Claim Text:
1. A method of transcoding a video signal made up of an input bit stream representative of frames of a video, each frame being made up of blocks of pixels, there being a corresponding block of data within the input bit stream for each block of pixels, the method comprising: for the bit stream of a frame of the video signal, identifying the type of frame; and for certain types of frame, disregarding a substantially equal proportion of the data in respect of plural blocks within the frame to account for local motion activity within the frame, wherein the input bit stream is representative of the non-zero transform coefficients of frames of the video signal and wherein the disregarded data is a proportion of the non-zero transform coefficients for all blocks within a frame, and wherein the proportion of transform coefficients is determined by variation at a factor of α, wherein there are N non-zero transform coefficients in a block of a received frame and M non-zero transform coefficients in a block of the transrated video stream, and wherein M=αN.