Canon Kabushiki Kaisha

Ebara Corporation

Tsutomu Takada

Takeshi Akiyama

Shuichi Nakamura

Yusuke Yamamoto

Hiroki Kitamura

Kenzo Tojima

Masanao Motoyama

Yoshiyuki Akiba

Takaaki Nagaoka

Hitoshi Kawaguchi

Susumu Shimizu

With this invention, color shifting correction is performed first based on shifting amount information indicating a shifting amount with respect to the scanning direction on an image carrier of each image forming unit, and halftone processing is then performed, thus suppressing generation of moir&#xe9; due to the color shifting correction, and forming a high-quality image. To this end, an image forming engine has color shifting amount storage units C, M, Y, and K (black) which store actual shifting amounts with respect to ideal scan directions on image carriers C, M, Y, and K in image forming units C, M, Y, and K. Color shifting correction amount arithmetic units C, M, Y, and K calculate color shifting correction amounts for respective color components on the basis of the stored color shifting amounts. Color shifting correction units C, M, Y, and K perform color shifting correction by converting coordinates upon reading out image data from bitmap memories C, M, Y, and K on the basis of the calculated color shifting correction amounts, and then perform tone correction. Data after tone correction undergo halftone processing by halftone processors. C, M, Y, and K. PWM processors C, M, Y, and K generate PWM signals for scanning, and output them to exposure units C, M, Y, and K of the respective image forming units.

Image processing apparatus and an image processing method for performing a correction process of a tone value of a pixel for smoothing a jaggy

Color shifting correction is performed first based on shifting amount information indicating a shifting amount with respect to the scanning direction on an image carrier of each image forming unit, and halftone processing is then performed, thus suppressing caused by color shifting correction, and forming a high-quality image. An image forming engine has color shifting amount storage units storing actual shifting amounts with respect to ideal scan directions on image carriers in image forming units. Color shifting correction amount arithmetic units calculate color shifting correction amounts for respective color components using stored color shifting amounts. Color shifting correction units perform color shifting correction by converting coordinates upon reading image data from bitmap memories using calculated color shifting correction amounts, and perform tone correction. Data after tone correction undergo halftone processing. PWM processors generate PWM signals for scanning, and output them to exposure units of respective image forming units.

Image processing using derived correction amount

A shifting amount of color compensation amount is calculated based on a shifting amount of color obtained from a shifting amount of color storage unit for each image forming unit, and shifting amount of color compensation in the pixel unit is performed by executing address conversion using the calculation result. A feature of an image to be processed is detected, and color density conversion compensation for performing shifting amount of color compensation in less than the pixel unit is performed according to the detected feature. Furthermore, half-tone processing or exceptional processing is selectively executed according to the detected feature.

Image forming apparatus and its control method, and computer program and computer-readable storage medium

Image forming apparatus and its control method, and computer program and computer readable storage medium

An inverter device mounted on a heat sink for controlling a pump is cooled with a cooling liquid which is typically water discharged by the pump. The rate of flow of the cooling liquid supplied to the heat sink is regulated by a flow regulating mechanism based on the temperature of the heat sink detected by a temperature detecting device, for thereby keeping the temperature of the heat sink in a predetermined range. The heat sink supplied with the cooling liquid which is thus regulated by the flow regulating mechanism prevents the inverter device and wires connected thereto from being overly cooled and hence from suffering moisture condensation.

Method of liquid-cooling an inverter device

Growing community of inventors

Yokohama, Japan

Tsutomu Takada