Pfu Limited

Fujitsu Corporation

Yukio Kaji

Norio Kanemitsu

Mikio Murosaki

Toshiki Nakajima

Satoshi Kubo

Nobuhisa Yamazaki

Yasushi Takemura

Ikuo Murata

Shougou Maki

Tomoya Tanabe

Kunihiko Oumi

After reading a predetermined number of predetermined blocks for each of a plurality of image data, a first image read unitreads out the plurality of image data read in parallel by repeatedly switching the designated order of the plurality of image data. A JPEG compression unitperforms image compression on the plurality of image data read out in block units by the first image read unit, image-compresses a predetermined number of the blocks for each of the plurality of image data, and then inserts an identifier after the last block of the predetermined number of blocks.

Image processing system with parallel input and restart marker

An enhancement and interpolation circuit forms enhanced image data by performing enhancement and interpolation processing on image data. A floating slice circuit obtains a floating slice level for said image data. A binarization and density conversion circuit binarizes enhanced image data using the floating slice level to form binarized image data. In the double-side read mode, simultaneously read image data on the right and reverse sides of a document are transferred at a first rate. In the one-side read mode, image data on the right side of a document is transferred at a second rate that is slower than the first rate by data transfer means. An image discriminating circuit forms an image discriminating instruction for read image data. A white level signal generating circuit forms a new white level signal by subjecting said image data and a current white level signal in accordance with an operation designation instruction corresponding to an image discriminating instruction. This new white level signal is stored as the next white level signal.

Image scanner

An image scanner connected to a host computer to transfer data to the host computer in accordance with a predetermined interface includes a first read unit and a second read unit in a double-side read mode to read image data on a right side and a reverse side of a first document, respectively. A third read unit in a one-side read mode reads image data on a right side of a second document. A read control unit controls the first and second read units so that the image data can be read simultaneously and controls the third read unit. A signal processing unit produces the image data on the right and reverse sides of the first or second documents. A data transfer unit transfers the image data on the right and reverse sides of the first document or second document at a predetermined speed in accordance with the predetermined interface.

A first aspect of the present invention provides a white level setting system for an image scanner. The system compares an analog image signal obtained by scanning an original or a white reference with a predetermined analog white level signal, to provide a digital image signal corresponding to an image on the original, calculates a white level for the next scan line according to the digital image signal, and employs the white level for the next scan line. A second aspect of the present invention provides a binarization system for an image scanner. The system divides read image data into predetermined unit blocks, finds rates of changes in gray levels in each of the blocks, detects edges of the image data according to the rates of changes, determines a slice level for each of the blocks according to the gray levels of the edges, and converts the image data of each of the blocks into binary data according to the slice level.

Binarization system for an image scanner

In an image scanner having a flat bed type structure and an automatic document feeding type structure, the scanner includes: an image read unit at least including a lamp, a mirror and CCD sensors to read a manuscript which is put on the structure; an image control unit operatively connected to the image read unit to process an image read by the image read unit; a host computer operatively connected to the image control means; and the image control unit including a main printed-circuit board provided for the original functions of the image scanner, a main connector connecting the image control means to the host computer, a user printed-circuit board selectively provided by a user as an extended slot and the board being mounted within the image control unit, and a user connector connecting the main printed-circuit board to the user printed-circuit board. Further, the image scanner has a function of correction for a difference in an image output between the FB type and the ADF type by adjusting a change rate from the white/black reference level, the gain of the amplifier, the lamp current, or a predetermined conversion formula.

Image scanner having system extending function and image correcting

The present invention provides a white level setting system for an image scanner. The system compares an analog image signal obtained by scanning an original or a white reference with a predetermined analog white level signal, to provide a digital image signal corresponding to an image on the original, calculates a white level for the next scan line according to the digital image signal, and employs the white level for the next scan line.

Growing community of inventors

Kanazawa, Japan

Yukio Kaji