Input Image Features Affecting Visibility of Density Unevenness

Abstract

Density unevenness degrades quality of a printed image when density difference from an original image is large. However, visibility of the density unevenness varies depending on contents of the original input image. We assumed visibility of the density unevenness, which appears in various printed images in the market, could be affected by some features of input images. We took up the saliency distribution and the spatial frequency of tone distribution in the input image as key features, and performed experiments to clarify correlation between visibility of density unevenness and those features. We found that the key feature was spatial frequency components, similar to those of the density unevenness, in the input image area with the same size as the density unevenness. The correlation with saliency was found to be week, but would be tested again since the experimental method should be improved.