Hitachi, Ltd.

Panasonic Corporation

Matsushita Graphic Communication Systems, Inc.

Panasonic Communications Co., Ltd.

Yoshikazu Naito

Shinichi Sato

Nobutaka Okuyama

Toshiharu Shimizu

Fumiko Koshimizu

Syuzo Matsumoto

Hideyuki Shirai

In order to allow an arbitrary combination of image processing function blocks and an arbitrary processing order to be executed with a single command and avoid calculation loads on a host CPU even when image processes in varying output image sizes are combined, the image signal processing apparatus of the present invention includes an individual processing sub program that operates image processes in page units or with an arbitrarily specified number of lines for each image processing function block and an individual processing parameter table that determines the individual processing contents and also provides a composite processing parameter table including image processing order information and image size related information and when an individual image processing command is issued, the image signal processing apparatus sets an individual processing parameter table in an image processing function block and executes the individual processing sub program.

Image signal processing apparatus

Error addition section generates correction data by adding correction value Emo and correction value E to the input data. Binary processing section converts the correction data to binary data to generate output data. Binary error calculation section calculates binary error E based on the correction data and output data. Propagation coefficient judgment section judges propagation coefficients K to K Propagation error operation section operates on binary error E and propagation coefficients K to K to calculate correction value E and correction value Emi. Error memory temporarily stores correction value Emi, and outputs it to error addition section when the pixel data to be corrected is input.

Image processor for processing an image with an error diffusion process and image processing method for processing an image with an error diffusion process

The image scaling processing device distinguishes whether an original image data is a character image or a half-tone image per a pixel unit in the image domain separating portion and scales each image in the character scaling processing portion and the half-tone scaling processing portion. In order to get a desired scale factor L times image data, the character scaling processing is performed by the first scaling processing for enlarging an image data by 2.sup.n times (n is an integer, L&lt;2.sup.n) in each sub scanning direction and main scanning direction and by the second scaling processing for reducing by L/2.sup.n times the image data enlarged by 2.sup.n times and the half-tone scaling processing is made by the first scaling processing for enlarging an image data by 2.sup.n times (n is an integer, L&gt;2.sup.n) in each sub scanning direction and main scanning direction and by the second scaling processing for enlarging by L/2.sup.n times the image data enlarged by 2.sup.n times.

Image scaling processing device and image scaling processing method

A deflection yoke for a picture tube of a projection color television receiver set has a solenoid-shaped auxiliary coil arranged adjacent to a core of the deflection yoke with a center axis of the auxiliary coil being aligned to a center axis of the deflection yoke. A vertical deflection current or a horizontal deflection current is supplied to the auxiliary coil. An electron beam is deflected by a magnetic field generated by the current of the auxiliary coil so that a raster formed on a face plate of the picture tube is deformed. The raster is deformed to such an extent that it has a correct shape when it is projected on a screen.

Deflection yoke for a picture tube of a projection color television

A projection color television receiver set comprises three picture tubes juxtaposed to one another and producing red, green and blue light images which are projected through respective lenses onto a single screen to be reproduced as a single synthesized color picture. In order that rectangular rasters produced by the picture tubes disposed at both sides of the center picture tube are prevented from being deformed into trapezoidal rasters when projected on the screen, deflecting yokes used in the lateral picture tubes are provided with horizontal deflection winding in such arrangement that trapezoidal rasters are produced on faceplates of the laterally disposed picture tubes, respectively, which rasters are projected in a rectangular form on the single screen in alignment with the rectangular raster produced and projected from the center picture tube, whereby a color picture of an improved quality is reproduced on the screen, involving substantially no misconvergence. Auxiliary deflecting yokes and associated electric circuit of complicated configuration required heretofore to this end are spared.

Growing community of inventors

Yokohama, Japan

Yoshikazu Naito