Patent ID: 8345776
Filing Date: 2013-01-01
Classification: H04N

Abstract:
1. An encoder in an error control system for video coding, comprising a base layer encoding apparatus and at least one enhancement layer encoding apparatus, the encoder further comprising: an encoder drift control apparatus, configured to adjust a value of an encoder leaky factor according to local information of the base layer encoding apparatus, wherein the local information is number of quantized transformation non-zero coefficients of a current block in the base layer; and the enhancement layer encoding apparatus is configured to attenuate a motion-compensated signal of the current block in the enhancement layer according to the adjusted value of the encoder leaky factor to control an error drift; wherein the encoder drift control apparatus is configured to adjust the value of the encoder leaky factor of the current block, alphaCurr, according to the following formula: wherein nCB is a number of quantized transformation non-coefficients of a current block in the base layer, nCTrs is a predetermined threshold for the quantized transformation non-coefficients, alphaMax is a maximum leaky factor, and sF is a scale; wherein the maximum leaky factor alphaMax equals to 1; or the maximum leaky factor alphaMax equals to (max_cliff ref scale for zero_base_block-I-1)/32; and wherein a syntax element max_cliff ref scale_for_zero_base_block, with a range of 0-31, is set as a maximum scale factor for scaling a differential reference signal according to a present SVC standard.