Visual Effects of Sampling in Digital Picture Processing. A Pilot Study

摘要

Experiments were designed to study how sampling distortions due to aliasing and band limitation are perceived and affect image quality. Sampling effects were investigated with two different scenes. The first experiment comprised ratings of subjective similarity between pictures processed with different combinations of prefiltering and sample frequency. The second experiment comprised subjective ratings of similarity between pictures processed with different combinations of white Gaussian noise and sample frequency. The similarities were analyzed by a multidimensional scaling technique (INDSCAL). The multidimensional analyses indicated that the subjective sampling effects could appear as unhomogeneous noise texture (false spots), illdefined contours, displaced contours or loss of pattern elements; however, the saliency of each dimension was found to depend on scene properties.