Minolta Company, Ltd.

Makoto Kumagai

Takayuki Nabeshima

Katsuaki Tajima

Hidekazu Takahama

Atsushi Ishikawa

Satoshi Iwasaki

Hideaki Mizuno

Taisuke Akahori

Hiroyuki Suzuki

Kazuhiro Ishiguro

Keiji Kusumoto

Daisetsu Tohyama

Masao Kondo

Takahiro Kitayama

Kazunori Shionoya

A color image processing apparatus extracts foreground image data and background image data from whole image data, and corrects one or more among hue, value and chroma of the foreground image data based on one or more among hue, value and chroma of the background image data, thereby reproducing colors by means of correcting a color contrast phenomenon that appearances of the image change in response to an image of the background image data, and allowing color reproduction with high fidelity visually.

Color image processing apparatus capable of reproducing colors with high-fidelity visually

A data processing device connected to a network and an external memory device stores data in a memory area of the external memory device. Image data and the like are transferred and stored in the memory area of an external memory device, and the data name and storage destination of the stored data are recorded on a portable memory medium. This portable memory medium can be used to simply and easily manage the data location and the like at any time. Since the data name and storage destination are recorded in the portable memory medium, there is less concern that the data name and storage destination will become known to users other than the user possessing the portable memory medium, thus ensuring data security compared to when such data are stored in the data processing device. Moreover, because there is no need to store the data name and storage destination in the data processing device, the complex controls required for displaying the stored data names and the like on the display panel are unnecessary.

Data processing device for specifying data storage information on a portable recording medium

An image read apparatus includes a group of CCDs reading out a document image, a data processing unit, a line buffer to delay data to obtain data of the same pixel, a comparison unit comparing data of the same pixel, a data table in which a threshold value that becomes the reference of comparison is stored in correspondence with each type of mode, a threshold value set unit referring to the data table to set the threshold value, a determination unit receiving the comparison result with the threshold value from the comparison unit to determine and control data to be sent downstream, and an averaging unit averaging the data sent from the determination unit to output the average as image data. An image read apparatus is provided that can prevent generation of a black streak or a white streak on a readout image caused by the presence of dust at the readout position, and that can improve the picture quality of the entire image.

Image read apparatus and method that can obtain favorable readout image

To read an image with high resolution via a CCD linear sensor having a limited pixel count, an image reading apparatus includes: a CCD linear sensor having arranged in a main-scanning direction photoelectric conversion elements for receiving a light reflected from an original; a piezoelectric element for providing a relative displacement between a light receiving surface of the CCD linear sensor and an object's image formed on the light receiving surface, according to a predetermined oscillation function and in the main-scanning direction; and a sensor drive circuit timing the CCD linear sensor's charge accumulation. The sensor drive circuit uses a distance from a center of an amplitude of the relative displacement to the CCD linear sensor and a time period of charge accumulation by the CCD linear sensor to determine a time point to start charge accumulation. The apparatus also includes a signal synthesizing circuit using image signals output from the CCD linear sensor during one period of the predetermined oscillation function to reconstruct an image signal of one line.

Image reading apparatus and scanner using photoelectric conversion unit with limited pixel count to read images with high resolution and method thereof

During reading process, an image reading unit read a white pressing plate (reference member) under a state where no original exists between the white pressing plate and an original glass plate. On the basis of the read image data, it is judged whether dirt is detected on the glass plate or not. If dirt is detected, a page in which a black line appears is determined. Information of the page is displayed on a display section. An original of the page is reread by the image reading unit.

Image reading apparatus

In order to correct chromatic aberration accurately and read out a document original properly, an image reader apparatus includes a chromatic aberration correction chart, a CCD linear sensor, and a correction processing unit. A chromatic aberration correction chart includes a high reflectance portion and a low reflectance portion lower than the high reflectance portion. A CCD linear sensor receives light reflected from the chromatic aberration correction chart. A correction processing unit corrects chromatic aberration of image data according to a light receiving position in the photoelectric conversion unit receiving light of a first wavelength included in the reflected light from the chromatic aberration correction chart and a light receiving position in the photoelectric conversion unit receiving light of a second wavelength included in the reflected light from the chromatic aberration correction chart.

Image reading apparatus that can correct chromatic aberration caused by optical system and chromatic aberration correction method

In an image reading apparatus, three line sensors simultaneously read images in different positions of a document and output respective image signals. Line memories receive the image signals and output them with a timing corresponding to the positions in which the images represented by the image signals have been read. Analog signal processing for the image signals is executed in a parallel manner to thereby allow a high-speed image read operation to be achieved with a low-speed analog processing circuit.

Image reading apparatus and method utilizing a plurality of line sensors

A document scan apparatus comprises a document scanner unit 1 which scans a document by illuminating the document with light, a feed path 10 which extends from a document stack portion 4 to a document discharge portion 8 through the document scan portion 7 of the document scan unit 1, driving units 15, 16, 17, 18, 19 and 20 which drive the document on the document path and document size detection units 23 and 24. The document size detection units 23 and 24 detect the document size during the document is carried by the driving units 15, 16, 17, 18, 19 and 20. Then, the documents 4 are fed to the document scan position 7 without passing the document discharge portion 8.

Document scan apparatus, imaging forming apparatus having the document

The present invention has the objective of providing an image reading device capable of normally excellent reading of document images without influence from a soiled or damaged glass document platen, and eliminates the influence of a soiled or damaged glass surface of a document platen by normally reading document images using a new glass surface which is neither soiled not damaged by moving the document platen via a platen moving lever.

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Toyokawa, Japan

Makoto Kumagai