Patent ID: 8238444
Filing Date: 2012-08-07
Classification: H04N

Abstract:
1. A perceptual-based video coding method, comprising: using a processor to perform the steps of: providing a perceptual-based rate-distortion (R-D) curve as a predictive R-D curve that describes a relationship between a rate (R) and a perceptual-based distortion (D); obtaining a previous R-D point according to an encoded previous frame; determining a Lagrange multiplier for a current frame by determining a slope, with sign reversed, of a tangent to the predictive R-D curve at a current point that is on the predictive R-D curve and closest to the previous R-D point; and encoding the current frame according to the determined Lagrange multiplier; wherein the perceptual-based R-D curve is provided according to the following steps: receiving a key frame; encoding the key frame using a non-perceptual-based rate distortion optimization (RDO) for at least two different quantization parameters (QPs), therefore obtaining at least two R-D points; fitting the at least two R-D points to provide the R-D curve; and obtaining at least two model parameters (MPs) associated with the R-D curve.