面向Pointer色域的优化色差系统设计

Design of Optimal Chroma System for Pointer Color Gamut

为研究宽色域视频信号与现行电视系统的兼容传输,以Pointer色域为宽色域HDTV传输系统的目标色域,基于最小外接矩形(MER)技术,提出了RC和SC两种优化算法,得到了与ITU-RBT.709常规HDTV系统兼容传输的优化色差信号,并基于此建立新的色差编码系统.该系统在不改变现行HDTV传输系统基色和基准白色度参数、不扩大亮度和色差传输信号动态范围前提下,将可传输的Pointer色域由44%提高到100%,实现了宽色域HDTV信号的兼容传输.文中计算了信号收端重显色差,结果表明,与宽色域ITU-RBT.1361系统相比,优化的色差信号系统色视觉保真度较高.

In order to research the compatible transmission of wide color gamut video signals in current TV system,this paper took Pointer color gamut as target of widen gamut HDTV,put forward two kinds of optimization algorithm-RC and SC based on MER technology,got the optimized chroma signals which can be compatilbly transmitted in ITU-R BT.709 conventional HDTV system,and established new encoding system for chroma signals based on the optimized chroma signals.This system can increase the transmittable Pointer color gamut from 44% to 100% and realize the compatible transmission of wide color gamut HDTV signals without changing primary colors and reference white and without increasing the dynamic ranges of luma and chroma signals of ITU-R BT.709.The calculated reproduction color difference results show that the optimized chroma signal systems have higher color fidelity than wide color gamut ITU-R BT.1361 system.