Dainippon Screen Mfg. Co., Ltd.

Dainippon Screen Seizo Kabushiki-Kaisha

Ikuo Mitsuka

Akira Kuwabara

Takashi Sakamoto

Hitoshi Haibara

Yoshio Ono

Junji Shida

Testuo Hoki

Tetsuo Houki

In image scanning in which three lamps provided for Red, Green and Blue color components are switched successively and light transmitted through or reflected at an original is received by a CCD line photosensor, variation in lamp output light quantity with time and relative variations in output light intensity among the three lamps are corrected. In one embodiment, each lamp is turned off or operation of the CCD is terminated when the light quantity emitted from the lamp reaches a setup quantity. In a second embodiment, a voltage corresponding to the color component data obtained by the CCD is divided by a voltage corresponding to the effective light quantity emitted from each lamp.

Image data correction

In a method for controlling magnification variation in which an original picture image is projected on a light receiving surface with a desired magnification, the projected picture image is moved in the sub-scanning direction which intersects the main scanning direction where the sensor is aligned, and the feeding speed (V) in the sub-scanning direction and the electric charge storage time are controlled.

Method for controlling magnification variation

The method and system of this invention is capable of obtaining image data which underwent a layout process such as coordinate rotation and shifting processes, a trimming process and so forth at first by scanning a specific number of scanning lines of each original picture in accordance with layout data, then by storing the image data from the scanning to a memory in accordance with another layout data.

Method and system for processing image data in reproducing images

The resolution of an array sensor can be increased by projecting images of picture elements, which lie on the same scanning line, on a plurality of one-dimensional array sensors composed of a number of photoelectric transducers arranged with an equal interval in a row; and then subjecting picture signals, which have been output respectively from the array sensors, to a combination processing so as to obtain continuous picture signals. It is possible, without using any memory unit, to output picture signals with a resolution higher than that available from the use of a single one-dimensional array sensor, namely, with a resolution proportional to the number of a plurality of one-dimensional array sensors.

Method for increasing resolution of array sensor and system therefor

A halftone image is recorded on a photosensitive material by exposing the image to secondary exposing beam that is obtained by imparting to a primary beam two types of intensity modulation. The intensity modulation establishes a transmissivity distribution equivalent to that of a contact screen to which the halftone image is exposed.

Method of recording a halftone image

To determine the coordinate values of quantized sequential dots on a line segment connecting desired two points (x.sub.1, y.sub.1), (x.sub.2, y.sub.2) in a two-dimensional quantized coordinate system, line segment coordinates are processed at high speed by providing counters, each of which employs one quantum unit as the reference clock signal thereof, respectively for the x-axis and y-axis, controlling reference clock signals, which are to be input to the counters, in accordance with the information on the two points (x.sub.1, y.sub.1), (x.sub.2, y.sub.2), and employing output values of the counters as coordinate values of the quantized sequential dots. The above method features high-speed processing operations.

High-speed processing method of line segment coordinates

Image distortion is corrected by advancing the recording start position for a scan line as scanning progresses when an image is reproduced with an image reproducing system.

Growing community of inventors

Shiga, Japan

Ikuo Mitsuka