发明名称 PRINTER AND ITS IMAGE PROCESSOR
摘要 PROBLEM TO BE SOLVED: To reduce the cost by simplifying the circuitry of a pulse width modulation circuit. SOLUTION: The printer providing a halftone representation by forming dots comprises a halftoning section (26) for converting M bit image data into N (M>N) bit driving pulse width data, and a converting circuit (47) for comparing (46) image data with a plurality of threshold values being fed from a threshold value matrix and generating driving pulse width data depending on the comparison results. A random noise is applied to the plurality of threshold values or the image data when they are compared in order to suppress occurrence of a tone jump. The halftoning section has a means for determining the position of a driving pulse depending on the driving pulse width data of a pixel adjacent to a pixel under processing. COPYRIGHT: (C)2004,JPO
申请公布号 JP2004042325(A) 申请公布日期 2004.02.12
申请号 JP20020200329 申请日期 2002.07.09
申请人 SEIKO EPSON CORP 发明人 FUJITA TORU
分类号 B41J2/44;G06K15/12;G06T5/00;H04N1/036;H04N1/405;(IPC1-7):B41J2/44 主分类号 B41J2/44
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