Perceptibility of Non-sinusoidal Bands
Abstract:A common type of image quality problem involves the presence of periodic light and dark bands on an image that is meant to be uniform. Much work has been done on measuring the perceptibility of sinusoidal and square-wave bands and it is known that the sensitivity to these two types of bands with the same periodicity could vary quite significantly. This is especially true when the periodicity of the banding is large. However, it is not clear how to evaluate banding of large periodicity that is neither sinusoidal nor square-wave.
In this work, we report on a study investigating the perceptibility and objectionability of non-sinusoidal bands via psychophysical experiments. More specifically, we estimate the relative objectionability of sinusoidal bands and various types of non-sinusoidal bands. This will focus on bands with large periodicity, since the perceptibility of these bands varies the most depending on the “shape” of the band's profile. Our objectives are to assess the differ-ence in objectionability among various types of nonsinu-soidal bands and to apply the psychophysical data as a correction factor on the objectionability curve of sinusoidal bands.
Document Type: Research Article
Publication date: 2002-01-01
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