Patents by Inventor Kazuyoshi Koga

Kazuyoshi Koga has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6222563
    Abstract: A graphic processing apparatus for generating, displaying or printing characters and graphic data. A successive column access is used in which a row address is designated for access to a memory and data in different column addresses within the designated same row address are successively accessed and buffer means for buffering a series of data between an access by a processor and an access to a memory is provided. A program and image information for display are stored in a main memory. A frame buffer and the main memory are integrally configured simply and small in size.
    Type: Grant
    Filed: June 8, 1999
    Date of Patent: April 24, 2001
    Assignee: Hitachi, Ltd.
    Inventors: Koyo Katsura, Yasushi Fukunaga, Ryo Fujita, Kazuyoshi Koga, Takehiko Nishida
  • Patent number: 6118453
    Abstract: A graphics processor comprises: a light source table holding light source data; a conversion unit for converting the light source data to be set in the light source table from a float type (single-precision floating point real number type) into an int type (integer type); an inner product calculation unit for calculating the inner products of normal directions, light source directions and sight line directions at the vertices based on the light source data; and a color calculation unit for performing light source computations based on the calculated inner products to determine the colors of the vertices.
    Type: Grant
    Filed: December 19, 1996
    Date of Patent: September 12, 2000
    Assignee: Hitachi, Ltd.
    Inventors: Katsunori Suzuki, Ryo Fujita, Kazuyoshi Koga, Yuichi Abe, Mitsuru Soga, Kazuhisa Takami, Koyo Katsura, Hideki Fujii, Kazunori Oniki
  • Patent number: 6088037
    Abstract: A rendering processor having a plurality of DDA control circuits such that in each DDA circuit, the coordinates of source and destination images and gradation values are computed. Depending on the computation result, source and destination data to the raster arithmetic unit are generated so as to control the raster arithmetic unit, which enables a plurality of pixels to be generated and to be written in the memory during a memory access.
    Type: Grant
    Filed: September 18, 1996
    Date of Patent: July 11, 2000
    Assignee: Hitachi, Ltd.
    Inventors: Yasushi Fukunaga, Ryo Fujita, Kazuyoshi Koga, Isao Yasuda, Takeshi Kato
  • Patent number: 5982376
    Abstract: A novel graphic display apparatus in which the pixel information for a multiplicity of layers arranged according to Z value including the color, the proportion in which the figure occupies the pixel and the Z value are held for each layer in a pixel memory. The Z value is compared between the pixel information of a newly-plotted figure and the multi-tiered pixel information held in the pixel information memory. In order to reduce the amount of memory space required, the pixel information stored in the bottom layer of the pixel memory is a combination of information synthesized from the color information having the Z value of the bottom layer and from at least one other layer having a Z value lower than the Z value associated with said bottom layer. In the case where the Z values are substantially equal to each other, the mask values included in each pixel information are summed and the pixel information to be written in the pixel information memory is determined by a pixel information computing section.
    Type: Grant
    Filed: February 14, 1996
    Date of Patent: November 9, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Yuichi Abe, Ryo Fujita, Mitsuru Soga, Kazuyoshi Koga
  • Patent number: 5940087
    Abstract: A graphic processing apparatus for generating, displaying or printing characters and graphic data. A successive column access is used in which a row address is designated for access to a memory and data in different column addresses within the designated same row address are successively accessed and buffer means for buffering a series of data between an access by a processor and an access to a memory is provided. A program and image information for display are stored in a main memory. A frame buffer and the main memory are integrally configured simply and small in size.
    Type: Grant
    Filed: October 29, 1996
    Date of Patent: August 17, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Koyo Katsura, Yasushi Fukunaga, Ryo Fujita, Kazuyoshi Koga, Takehiko Nishida
  • Patent number: 5847715
    Abstract: A graphics display system includes a host processor calculating graphic data and providing the graphic data to a graphics processor, and frame memories which store the graphic pixel data and supply display data to display devices. The graphics display system also includes a first register group which stores the graphics data, a second register group which converts and/or stores the data in the first register group, a pixel generator which generates pixels according to the graphic data in the second register group, and a plotter which writes the pixel data generated in the pixel generator in the frame memories. The second register group fetches the data from the first register group when the host processor issues a command for plotting, holds the data previously written by the host processor. At the same time, when the host processor issues a command for plotting, the specified graphic type is written in the graphic processor as well as data calculated based on the first and second register groups.
    Type: Grant
    Filed: May 14, 1997
    Date of Patent: December 8, 1998
    Assignee: Hitachi, Ltd.
    Inventors: Ryo Fujita, Kazuhisa Takami, Mitsuru Soga, Koji Ozawa, Takaharu Morishige, Kazuyoshi Koga
  • Patent number: 5819077
    Abstract: A graphics system utilizes the graphics standardization specification PEX for providing high-speed drawing when a client and a server locally operate on the same machine and allow an application to change structure and graphics attributes defined by another application without being aware of the distinction between local and remote cases.
    Type: Grant
    Filed: March 22, 1996
    Date of Patent: October 6, 1998
    Assignee: Hitachi, Ltd.
    Inventors: Kazuyoshi Koga, Ryo Fujita, Katsunori Suzuki, Shoji Nakamura, Toshiyuki Kuwana, Hideki Fujii
  • Patent number: 5706034
    Abstract: A graphic processing apparatus for generating, displaying or printing characters and graphic data. A successive column access is used in which a row address is designated for access to a memory and data in different column addresses within the designated same row address are successively accessed and buffer means for buffering a series of data between an access by a processor and an access to a memory is provided. A program and image information for display are stored in a main memory. A frame buffer and the main memory are integrally configured simply and small in size.
    Type: Grant
    Filed: December 19, 1994
    Date of Patent: January 6, 1998
    Assignee: Hitachi, Ltd.
    Inventors: Koyo Katsura, Yasushi Fukunaga, Ryo Fujita, Kazuyoshi Koga, Takehiko Nishida
  • Patent number: 5666520
    Abstract: A graphics display system includes a host processor calculating graphic data and providing the graphic data to a graphics processor, and frame memories which store the graphic pixel data and supply display data to display devices. The graphics display system also includes a first register group which stores the graphics data, a second register group which converts and/or stores the data in the first register group, a pixel generator which generates pixels according to the graphic data in the second register group, and a plotter which writes the pixel data generated in the pixel generator in the frame memories. The second register group fetches the data from the first register group when the host processor issues a command for plotting, holds the data previously written by the host processor. At the same time, when the host processor issues a command for plotting, the specified graphic type is written in the graphic processor as sell as data calculated based on the first and second register groups.
    Type: Grant
    Filed: March 21, 1994
    Date of Patent: September 9, 1997
    Assignees: Hitachi, Ltd., Hitachi Microcomputer System, Ltd.
    Inventors: Ryo Fujita, Kazuhisa Takami, Mitsuru Soga, Koji Ozawa, Takaharu Morishige, Kazuyoshi Koga
  • Patent number: 5581796
    Abstract: In a case where a graphic image segment of which positional information is defined in a world coordinate system and of which size information is defined in a device coordinate system is developed to be displayed on a multi-window screen, the development processing performance is improved in peripheral portions of the window. A rectangular development area (first development area) associated with the window is expanded with consideration of a size information of a graphic segment so as to obtain a second development area. The second development area is compared with a rectangular area (an existence area) circumscribing a graphic image represented only with positional information of the graphic segment. As a result, whether or not the graphic segment is to be developed is determined. The first development area is reduced with consideration of size information of the graphic segment to produce a third development area.
    Type: Grant
    Filed: December 10, 1993
    Date of Patent: December 3, 1996
    Assignee: Hitachi, Ltd.
    Inventors: Kazuyoshi Koga, Ryo Fujita, Koyo Katsura, Yasushi Fukunaga, Hideyuki Hara
  • Patent number: 5371839
    Abstract: A rendering processor having a plurality of DDA control circuits such that in each DDA circuit, the coordinates of source and destination images and gradation values are computed. Depending on the computation result, source and destination data to the raster arithmetic unit are generated so as to control the raster arithmetic unit, which enables a plurality of pixels to be generated and to be written in the memory during a memory access.
    Type: Grant
    Filed: January 2, 1991
    Date of Patent: December 6, 1994
    Assignee: Hitachi, Ltd.
    Inventors: Yasushi Fukunaga, Ryo Fujita, Kazuyoshi Koga, Isao Yasuda, Takeshi Kato
  • Patent number: 4730186
    Abstract: A system using an input integrated flat panel display of an integrated structure, having an input device for inputting through handwriting characters, graphics, or points and a flat panel display laid upon the input device for displaying in accordance with an input point data input through handwriting. The frame memory of a large screen having a display screen larger than that of the flat panel display is arranged to be read out through the input device of the input integrated flat panel display. In addition, the readout contents of the large screen frame memory is arranged to be copied onto the flat display of the input integrated flat panel display. The input integrated flat panel display system can improve the man-machine performance while the amateur end user performs document processings, graphic processings and the like.
    Type: Grant
    Filed: April 19, 1985
    Date of Patent: March 8, 1988
    Assignee: Hitachi, Ltd.
    Inventors: Kazuyoshi Koga, Yasushi Fukunaga, Soshiro Kuzunuki, Ryo Fujita
  • Patent number: 4641354
    Abstract: An apparatus for recognizing and displaying handwritten characters and figures in which input stroke information on a handwritten input character or figure is read out by an electromagnetic tablet, recognition means performs character/figure recognition on the basis of the feature of the input stroke information, display means displays the input stroke information and the result of recognition, and when the result of recognition is displayed on a display screen of the display means, stroke information having been used for recognition is erased from the display screen, and stroke information which is not yet used for recognition, is left on the display screen.
    Type: Grant
    Filed: March 28, 1985
    Date of Patent: February 3, 1987
    Assignee: Hitachi, Ltd.
    Inventors: Yasushi Fukunaga, Soshiro Kuzunuki, Hiroshi Shojima, Takanori Yokoyama, Kazuyoshi Koga, Kotaro Hirasawa, Shinichi Kawada