Patent ID: 6347159
Filing Date: 2002-02-12
Classification: H04N

Abstract:
A method of reducing a number of levels in a multi-level grey scale pixel value representing a pixel and diffusing an error generated from reducing the number of levels, comprising the steps of:(a) receiving the multi-level grey scale pixel value of a first resolution; (b) generating a screened multi-level grey scale pixel value; (c) reducing the number of levels in the screened multi-level grey scale pixel value; (d) generating an error value as a result of the reduction process in said step (c); (e) diffusing the error value to multi-level grey scale pixel values of adjacent pixels; (f) converting the screened multi-level grey scale pixel value to a second resolution prior to the execution of said step (c), the second resolution being higher than the first resolution; and said step (d) generating an error value having a resolution corresponding to the first resolution.