Fujitsu Corporation

Kazuhiro Tamada

Hiroyuki Kaneda

Tsutomu Nagatomi

Kouji Maeda

Shigeyoshi Nakamura

Keizou Ueno

Eiichi Ebihara

Akihisa Sota

Takamitsu Aoki

Kouki Ishihara

Masayuki Horii

Hirofumi Nakayasu

Youji Houki

Hiroshi Yoshimura

Takeo Kojima

Yoshito Fukata

Morihisa Kawahara

Takao Sugano

Yoshihiko Taira

Kouichi Kobayashi

Hiroshi Fujimoto

Hiroji Uchimura

Toshio Konaka

Moriaki Sugimoto

Shingo Ashida

Masao Konisi

Hisao Moriwaki

Kouichi Uozumi

Daigo Uchikoshi

Mitsunori Hiraishi

A color image is scanned in the matrix direction by the number of colors calculating unit and the number (A) of colors of different full color pixel values is counted. In this instance, each time the number (A) of colors is counted up, a pallet forming unit sequentially stores the full color pixel values as representative colors into entries and forms a subtractive color pallet. When the number (A) of colors exceeds the number (n) of entries of the subtractive color pallet, a transfer format discriminating unit counts the number (N) of transfer pixels up to the end of one-preceding row and compares a transfer data amount by a full color format with a transfer data amount by a pallet format in the number (N) of transfer pixels, thereby allowing the data transfer by the color format of a smaller one of the transfer data amounts to be executed by a data transfer unit.

Color image transfer processing apparatus and method, color image

An image forming apparatus includes a transport mechanism transporting a recording medium on a belt which is transported at a constant speed in a transport direction, a plurality of electrostatic recording units arranged in the transport direction of the recording medium and transferring toner images of different colors, a positional error detecting part using the toner image of a reference color transferred by one of the electrostatic recording units as a reference image, and relatively detecting positional error information related to positional errors of the toner images of remaining colors transferred by the remaining electrostatic recording units with respect to the reference image, and a positional error correcting part relatively correcting the positional errors of the toner images transferred by the remaining electrostatic recording units based on the positional error information. The positional error detecting part includes a part for controlling the electrostatic recording units to transfer at least two resist marks on the belt at a scan starting end and a scan terminating end of the belt in a main scan direction which is perpendicular to the transport direction of the recording medium, with respect to each of the colors, and a second part, including a sensor detecting the resist marks, for detecting positional error quantities of the resist marks of each of the remaining colors with respect to the resist marks of the reference color based on detection times of the resist marks of reference color and the remaining colors.

Positional error correction for color image forming apparatus

A process discriminating unit allows an optimum converting process among a first magnification processing unit, a second magnification processing unit, a first reduction processing unit, a second reduction processing unit, and a third reduction processing unit to be executed on the basis of a conversion magnification (K), a resolution (D), and an image size. Particularly, each of the second magnification processing unit, first reduction processing unit, and second reduction processing unit magnifies an original image to a virtual image of a dot size obtained by magnifying a target image by 2 or 4 by an interpolation based on a simple repetition by a nearest neighborhood method and, after that, reduces to the target image in which the pixel value is obtained by averaging a plurality of pixels corresponding to one target pixel of the virtual image.

Apparatus and method for converting image size and recording medium

In a printing machine such as an impact printer, the printing gap between a print head and a platen is appropriately adjusted to cope with a variety of paper sheets. For adjusting the printing gap, the platen (or print head) is moved toward the print head (or platen) to press a paper sheet and then the platen (or print head) is moved to an origin position. Thereafter, the platen (or print head) is moved closer to the print head (or platen) by an appropriate pressing distance obtained by subtracting an appropriate value for the printing gap from the distance between the pressing position and the origin position.

Method and system for printing gap adjustment

Growing community of inventors

Kawasaki, Japan

Kazuhiro Tamada