Motion-induced degradations of temporally sampled images
Stephen Hsu · DSpace@MIT (Massachusetts Institute of Technology) · 1985
Current proposals for high-definition television (HDTV) standards do not plan to increase the effective temporal resolution, and as a result, motion-induced degradations will not improve. Since improvements can come about only with a better understanding of the nature of these defects, the objectives of this research were (1) to categorize the subjective defects and (2) to explore their dependence on parameters of the image and of a model transmission system. The parameters include velocity, object size, presampling filter, transmission rate, and interpolation filter. Properties of visual perception, along with signal and Fourier domain analysis of images, were used to explain the appearance, and predict the behavior, of defects in test patterns observed on a special-purpose 120 fps display system. The principal motion-induced defects, identified as blur, multiple images, and small-area flicker, were strongly dependent on observer eye movements. In the worst case, none of the transmission rates examined, regardless of the filtering scheme, would permit completely defect-free image reproduction at velocities typical of television. The nature of defects in future HDTV,