Patent ID: 9615085
Date: 2017-04-04
CPC Classifications: H04N

Claim:
1. A computer-implemented method of video coding with rate-distortion optimization, comprising: estimating, by a processor, a derivative of the structural similarity (SSIM) quality measure with respect to a quantization step Q using a reduced-reference SSIM model that utilizes a source video only; estimating, by the processor, a derivative of the data rate R with respect to the quantization step Q; minimizing, by the processor, a joint cost function defined as a sum of the data rate and one minus SSIM; utilizing, by the processor, a Lagrange parameter to control a trade-off between the data rate term and the SSIM term; determining, by the processor, an optimal Lagrange parameter based on a ratio between the estimated derivative of SSIM with respect to Q and the derivative of R with respect to Q; and utilizing, by the processor, the determined Lagrange parameter to encode the source video.