The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 04, 2012
Filed:
Apr. 14, 2010
Arata Yamaguchi, Tokyo, JP;
Hiroaki Sagae, Tokyo, JP;
Takashi Kimura, Kanagawa, JP;
Masakazu Yoshida, Kanagawa, JP;
Shigetaka Sakakibara, Kanagawa, JP;
Arata Yamaguchi, Tokyo, JP;
Hiroaki Sagae, Tokyo, JP;
Takashi Kimura, Kanagawa, JP;
Masakazu Yoshida, Kanagawa, JP;
Shigetaka Sakakibara, Kanagawa, JP;
Ricoh Company, Limited, Tokyo, JP;
Abstract
An image processing apparatus, which performs an error diffusion on M-value image data with an error weight matrix into N-value image data, includes: a corrected-value calculating unit that calculates a corrected value by adding a first value and a second value to a pixel value corresponding to a processing-target color component of a pixel of interest, the first value being obtained by multiplying an error for each quantized pixel of the processing-target color component by the matrix, and the second value being obtained by multiplying an error for each quantized pixel of a different color component by the matrix; a quantizing unit that compares the corrected value with a quantization threshold, and outputs N-value image data; and an error diffusion unit that calculates an error at the pixel of interest by subtracting a quantization threshold from a value obtained by adding the first value to the pixel value.