SUPRESSION CHARACTERISTICS OF THE MACH PHENOMENON IN STAIRCASE PATTERNS.

Abstract

IT HAS BEEN FOUND THAT WHEN THE EDGE TRANSITIONS OF THE STEPS OF STAIRCASE PATTERNS WERE EMPHASIZED BY MEANS OF A WAVEFORM, SIMILAR TO THAT OF A SECOND DERIVATIVE WAVEFORM, BRIGHTNESS COULD BE PERCEIVED MORE UNIFORMLY AND AS IF THE MACH PHENOMENON HAS BEEN SUPPRESSED. THIS REPORT DESCRIBES THE RESULTS OF QUANTITATIVE MEASUREMENTS AND CONSIDERATIONS OF THE DIFFERENCES IN BRIGHTNESS, THAT OCCUR IN THE APPEARANCE OF A STAIRCASE WAVEFORM PATTERN WHEN THE CONTOUR IS, OR IS NOT, EMPHASIZED. ITS EFFECT ON THE PICTURE QUALITY IS ALSO DISCUSSED. IN JAPANESE WITH ENGLISH ABSTRACT.