Patent ID: 6333793
Filing Date: 2001-12-25
Classification: H04N

Abstract:
An image processing device for converting multi-level-image data into binary-image data by using one of a least average error method and an error diffusion method, comprising:an image-data-correction unit which corrects multi-level-image data of a current pixel by adding thereto an error diffused from surrounding binarized pixels so as to output corrected-image data;a binarizing unit which binarizes the corrected-image data by comparing the corrected-image data with a predetermined threshold;an error-calculation unit which calculates an error of the current pixel based on the corrected image data and a result of the binarization; andan error-correction unit which corrects errors of surrounding pixels when the result of the binarization of the current pixel represents a predetermined one of a black dot and a white hole, and refrains from correcting the errors of the surrounding pixels when the result of the binarization of the current pixel represents another one of the black dot and the white hole.