Showing papers by "Nagaaki Ohyama published in 1986"
TL;DR: In this method, halftone screened images are sampled twice with different sampling rates, and the selection of proper frequency components less suffering from aliasing errors can effectively suppress moire fringes.
9 citations
TL;DR: In this paper, the authors discussed the necessary number of sampling steps to reduce under-sampling errors in a fringe scanning interferometer and some examples of the necessary sampling steps.
8 citations
TL;DR: In this paper, the null test of an aspherical mirror from a spherical mirror was proposed without using any special optical element, where the excess optical path difference due to an off-axis scatter point was removed.
7 citations
01 Apr 1986
TL;DR: A digital method for the restoration of color-shifted images is proposed that makes use of phase-only matching followed by a resampling operation to compensate for a space-variant shift between different primary color images.
Abstract: Color CCD endoscopes with sequential three color illuminations have the advantage of a high resolution but are sensitive to object motion. A digital method for the restoration of color-shifted images is proposed. The method makes use of phase-only matching followed by a resampling operation to compensate for a space-variant shift between different primary color images. Restored images are suitable for further image processing such as color emphasis and structure enhancement.
3 citations
01 Apr 1986
TL;DR: A basic concept is shown of color image processings without destroying the color balance and applications to the emphasis of endoscopic images and to a color image restoration.
Abstract: A basic concept is shown of color image processings without destroying the color balance. Applications to the emphasis of endoscopic images and to a color image restoration are presented.