Compensation Methods for Detail Reproduction of Highly Saturated Color Picture in EDTV System

Abstract

In conventional television systems, such as NTSC, gamma correction takes places at the transmitter, with the result that some of the luminance of a subject is conveyed by the chrominance channels as well as by the luminance channel. The band-limitation of the chrominance channels affects reproduction of detail and saturated color pictures less detailed. In this paper, pre-compensation methods are proposed and their characteristics are analyzed. These methods have been tested by hardware, showing some amount of improvement for in-door programs or athletic programs. These methods have been proposed by the BTA (Broadcasting Technology Association) and by the Telecommunications Technology Council as the technologies of EDTV systems of Japan.