Optimizing color edge contrast in presence of noise and amplitude quantization errors

摘要

Large-scale, direct view TV screens, in particular those based on liquid crystal technology, are beginning to use structures with more than three subpixels to further reduce the visibility of defective subpixels, increase spatial resolution, and perhaps even implement a multi-primary display with up to six different primaries. This newly available "subpixel" resolution enables us to improve color edge contrast thereby allowing for shorter viewing distances through a reduction of perceived blur. However, not only noise, but also amplitude quantization can lead to undesirable, additional visual artifacts along contours. Using our recently introduced method of contour phase synthesis in combination with non-linear, color channel processing, we propose a simple method that maximizes color edge contrast while maintaining or suppressing visual artifacts as well as noise below the threshold of visual perception. To demonstrate the advantages of our method, we compare it with some classical contrast enhancement techniques such as cubic spline interpolation and color transient improvement.