Digitizing Process of HDTV Standard Pictures for Subjective Assessment

Abstract

We have produced digital pictures to be used in subjective assessments of HDTV picture quality.
A drum scanner is used as the input device, to assure useful quality for the assessments, and a series of signal processes are performed by computer. Some technical factors, such as resolution, aliasing, color reproduction, gray scale characteristics and precision of quantization are taken into account in producing the digital pictures.
To reduce the alias component, 16-times over-sampling is employed and sub-sampling with filtering is performed by computer. Gray scale characteristics are corrected by polynomial approximation, and color reproduction is compensated for by linear matrixing. After signal processing, precision of quantization becomes equivalent to that of the 10-bit linear quantization applied to the gamma pre-corrected video signal.