Methods and systems for combining luminance preserving quantization and halftoning
AssigneeSamsung Electronics Co., Ltd.
InventorsNing Xu, Yeong-Taeg Kim
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Abstract
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.
Claims14
A method of video processing, comprising the steps of:
- receiving a color signal comprising RGB of a pixel and its spatial and temporal positions;
- quantizing the RGB signal into a quantized RGB color signal having a predetermined quantization level as a function of halftoning and luminance preserving quantization;
- and
- outputting the quantized RGB color signal.
A video processing system, comprising:
- means for receiving a color signal comprising RGB of a pixel and its spatial and temporal positions;
- a quantizer that quantizes the RGB signal into a quantized RGB color signal having a predetermined quantization level as a function of halftoning and luminance preserving quantization;
- and
- outputting the quantized RGB color signal.
Dependencies are inferred from the claim text.