ADAPTIVE PERCEPTUAL MAPPING AND SIGNALING FOR VIDEO CODING

摘要

A method is provided for encoding a digital video to improve perceptual quality. The method includes receiving a digital video at a video encoder, providing a perceptual quantizer function defined by; $$ PQ\left(L\right)={\left(\frac{c_1+c_2L^{m_1}}{1+c_3L^{m_1}}\right)}^{m_2},$$ ;wherein L is a luminance value, c₁, c₂, c₃, and m₁ are parameters with fixed values, and m₂ is a parameter with a variable value, adapting the perceptual quantizer function by adjusting the value of the m₂ parameter based on different luminance value ranges found within a coding level of the digital video, encoding the digital video into a bitstream using, in part, the perceptual quantizer function, transmitting the bitstream to a decoder, and transmitting the value of the m₂ parameter to the decoder for each luminance value range in the coding level.