Image processing apparatus, image processing method and image processing program that performs a level conversion on multilevel input image data
September 17, 2030. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesImage processing apparatus Image processing apparatus for half-tone processing and reproducing high speed images of different resolutions Method and apparatus for minimizing artifacts in images produced by error diffusion halftoning utilizing ink reduction processing Image dithering method enabling conversion of a gray level pixel image into a binary pixel image Image-data processing apparatus Method and apparatus for minimizing artifacts in images produced by error diffusion halftoning Error-diffusion-type half-toning employing adaptive thresholding for enhanced smoothness Method and apparatus for producing halftone image with threshold matrix Method and system for converting multi-gradated image data into binary image data Dither matrix producing method InventorAssigneeApplicationNo. 12884866 filed on 09/17/2010US Classes:382/237Gray level to binary codingExaminersPrimary: Krasnic, BernardAttorney, Agent or FirmForeign Patent References
International ClassesG06K 9/36G06K 9/46 G06K 15/00 G06K 15/02 H04N 1/40 H04N 1/405 H04N 1/60 H04N 1/46 AbstractA binary conversion error value as to neighboring pixels stored in an error value storage portion is added to a pixel density of a subject pixel, which is read from an input image storage portion, at a ratio based on an error distribution matrix, so that a modified density is calculated. A determination is made as to whether the modified density is greater than or equal to a threshold value, and an output image is binarized based on the determination, and stored in an output image storage portion. An output density, which is a value of the output image for calculating the binary conversion error value, is set to a value corresponding to a print mode currently set. By subtracting the output density from the modified density, the binary conversion error value generated in the binarization process for the subject pixel is calculated. | |
