| 摘要 |
A color quantization or re-quantization method is provided that combines two dimensional halftoning with luminance preserving quantization (LPQ) for better perception results of high precision color video quantization. A combination of LPQ and error diffusion, and a combination of LPQ and spatial dithering, is provided. To combine LPQ and spatial dithering, the spatial dithering is regarded as a two-step processing, a mapping and a simple rounding. To combine LPQ and dithering together, a rounding step is replaced by the LPQ algorithm in the combination. Further a method is provided for post-processing which is applicable to both cases to reduce the color perception for grayscale image.
|
