초록 ▼

A method and system assigns an image classification to a multi-level grey scale pixel value. The multi-level grey scale pixel value is modified based on an error generated by previously processed pixels and the image classification of the multi-level grey scale pixel and processed based on the assig

A method and system assigns an image classification to a multi-level grey scale pixel value. The multi-level grey scale pixel value is modified based on an error generated by previously processed pixels and the image classification of the multi-level grey scale pixel and processed based on the assigned image classification to reduce the number of grey levels in the multi-level grey scale pixel value. An error is generated based on the processing of the modified multi-level grey scale pixel value and a portion of the error is diffused to a next pixel in a fastscan direction and a remaining portion of the error is diffused to pixels in a slowscan direction. The modified multi-level grey scale pixel value referred above includes an error from the previously processed neighboring pixels if the current pixel is classified as being processed as an error diffused pixel. The modified multi-level grey scale pixel value equals to the original pixel value if the current pixel is classified as being processed as a non-error diffused pixel.

대표청구항 ▼

[ What is claimed is:] [1.] A method of reducing a number of levels in a multi-level grey scale pixel value representing a pixel, comprising the steps of:(a) assigning an image classification to a multi-level grey scale pixel value of a first resolution;(b) modifying the multi-level grey scale pixel

[ What is claimed is:] [1.] A method of reducing a number of levels in a multi-level grey scale pixel value representing a pixel, comprising the steps of:(a) assigning an image classification to a multi-level grey scale pixel value of a first resolution;(b) modifying the multi-level grey scale pixel value based on the image classification of the multi-level grey scale pixel;(c) adding a first error generated from previously processed neighboring pixels to the modified pixel value, if the pixel is classified as an error diffused pixel and no error to the modified pixel value if the pixel is classified as a non-error diffused pixel;(d) processing the modified multi-level grey scale pixel value based on the assigned image classification to reduce the number of grey levels in the multi-level grey scale pixel value;(e) generating a second error based on the processing of the modified multi-level grey scale pixel value;(f) diffusing a portion of the second error to a next pixel in a fastscan direction; and(g) diffusing a remaining portion of the second error to pixels in a slowscan direction.