Patent ID: 9008171
Filing Date: 2015-04-14
Classification: H04N

Abstract:
1. A method of quantizing coefficients of a video block for a video coding process that supports context-based adaptive binary arithmetic coding (CABAC), the method comprising: generating a set of candidate coefficients from coefficients of a video block based at least in part on a coefficient absolute value threshold; estimating a last non-zero coefficient of the video block from the set of candidate coefficients, wherein estimating the last non-zero coefficient from the set of candidate coefficients includes approximating costs associated with coding the video block via the CABAC, wherein different ones of the approximated costs correspond to different coefficients from the candidate set of coefficients being the last non-zero coefficient; and generating a set of quantized coefficients for the video block based on an assumption that the estimated last non-zero coefficient is actually the last non-zero coefficient of the video block, wherein generating a set of quantized coefficients includes selecting level values for coefficients of the video block preceding the estimated last non-zero video coefficient.