Title :
Improving digital halftones by exploiting visual system properties
Author :
Mulligan, Jeffrey B.
Author_Institution :
NASA Ames Res. Center, Moffett Field, CA, USA
Abstract :
The visibility of quantization noise in digital halftones can be predicted from psychological data on spatial and temporal contrast sensitivity. Simple models of the visual system can be incorporated into halftoning algorithms to minimize the visibility of the resulting artifacts. Filter-based algorithms may be customized to match the error filter to human contrast sensitivity under known viewing conditions. The relative insensitivity of the visual system to high frequency chromatic modulation allows visible luminance noise to be reduced at the expense of additional (but invisible!) chromatic noise. The techniques are easily extended to three dimensions for displays which can be modulated in time such as CRTs and flat panel displays
Keywords :
error analysis; filtering and prediction theory; image coding; image segmentation; video signals; CRT; chromatic noise; digital halftones; error filter; filter-based algorithms; flat panel displays; halftoning algorithms; high frequency chromatic modulation; human contrast sensitivity; psychological data; quantization noise; spatial contrast sensitivity; temporal contrast sensitivity; three dimensional displays; viewing conditions; visibility; visible luminance noise; visual system properties; Cathode ray tubes; Flat panel displays; Frequency modulation; Humans; Matched filters; Noise reduction; Psychology; Quantization; Three dimensional displays; Visual system;
Conference_Titel :
Signals, Systems and Computers, 1993. 1993 Conference Record of The Twenty-Seventh Asilomar Conference on
Conference_Location :
Pacific Grove, CA
Print_ISBN :
0-8186-4120-7
DOI :
10.1109/ACSSC.1993.342427