Patents by Inventor Tokumichi Murakami

Tokumichi Murakami 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).

  • Method and apparatus for coding an input signal based on characteristics of the input signal
    Patent number: 6272177
    Abstract: An interframe coding system which eliminates higher frequency components contained in an image signal effectively and adaptively with an adaptive filter provided in a coding loop. The adaptive filter eliminates the higher frequency components with the optimal filtering intensity for an image signal specified with a filtering coefficient which is decided by a filter controller. The filtering coefficient is decided by normalization of the difference between an input image signal and a predictive signal from a frame memory by the “Activity” of the input image signal or the predictive signal. The “Activity” can be based upon the sum of the absolute or squared difference values based upon the mean value of luminance intensity of pixels of the image signal.
    Type: Grant
    Filed: May 20, 1996
    Date of Patent: August 7, 2001
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Tokumichi Murakami, Yoshiaki Kato, Toshiaki Shimada
  • Remultiplexing apparatus
    Publication number: 20010009556
    Abstract: The remultiplexing apparatus comprises a control information selecting means for selecting a packet containing program control information from the inputted bit stream, a program control information editing means for editing contents of the selected program control information and generating new program control information corresponding to an outputted bit stream, and a remultiplexing means for multiplexing again the packet containing media information in the inputted bit stream and the program control information generated by the program control information editing means.
    Type: Application
    Filed: March 27, 2001
    Publication date: July 26, 2001
    Applicant: Mitsubishi Denke Kabushiki
    Inventors: Yoshiaki Kato, Yuka Fujita, Tokumichi Murakami
  • Image coded data re-encoding apparatus without once decoding the original image coded data
    Patent number: 6246438
    Abstract: An image coded data re-encoding apparatus (30) which generates in an image coded data analyzer (310) coded data after signal processing (221) by performing a first digital signal processing on first image coded data (220), supplies an image coded data synthesizer (320) with the coded data after signal processing (221) and multiple signals (222) associated with the first image coded data, and generates in the image coded data synthesizer (320) a second image coded data (240) by performing on the coded data after signal processing (221) a second digital signal processing based on multiple signals (222). The second image coded data is generated without once decoding the first image coded data. This makes it possible to prevent degradation in image quality, delay involved in the transform and an increase of the device size.
    Type: Grant
    Filed: July 12, 1999
    Date of Patent: June 12, 2001
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hirofumi Nishikawa, Kohtaro Asai, Tokumichi Murakami
  • Apparatus and method for remultiplexing and coding multimedia information
    Patent number: 6233255
    Abstract: The remultiplexing apparatus includes a control information selector that selects a packet containing program control information from the inputted bit stream, a program control information editor that edits contents of the selected program control information and generates new program control information corresponding to an outputted bit stream, and a remultiplexer for multiplexing again the packet containing media information in the inputted bit stream and the program control information generated by the program control information editor.
    Type: Grant
    Filed: February 28, 1997
    Date of Patent: May 15, 2001
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoshiaki Kato, Yuka Fujita, Tokumichi Murakami
  • Image coded data re-encoding apparatus without once decoding the original image coded data
    Patent number: 6222887
    Abstract: An image processing apparatus includes a data analyzer for extracting first decoding parameters representative of the first image data signal. A signal processor is coupled to the data analyzer for signal processing of the first coding parameters and outputting processed first coding parameters. A data synthesizer individually converts the processed first coding parameters into corresponding second coding parameters. The data synthesizer includes a coder for encoding the second coding parameters into a composite second image data signal.
    Type: Grant
    Filed: July 12, 1999
    Date of Patent: April 24, 2001
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hirofumi Nishikawa, Kohtaro Asai, Tokumichi Murakami
  • Image signal coding system
    Publication number: 20010000072
    Abstract: An adaptive blocking coding system selects an effective blocking of an input image signal to be encoded in accordance with the correlation between fields, even if motion is detected between the fields. The blocking patterns include an individual field blocking, a non-interlace blocking, a split blocking and an inverted split blocking. Further, the coding system searches for motion from both odd and even fields of a frame for producing a motion compensated prediction signal in order to provide high-efficient coding.
    Type: Application
    Filed: December 4, 2000
    Publication date: March 29, 2001
    Inventors: Hirofumi Nishikawa, Yoshihisa Yamada, Tokumichi Murakami, Kohtaro Asai
  • Method and apparatus for digital image decoding
    Patent number: 6208689
    Abstract: A method and apparatus of digital image decoding is provided for reducing compression-related deterioration of an image to a minimum with a reduced storage capacity. The digital image decoding apparatus is equipped with a compression rate judging section for judging an optimal rate of compression for effecting the least deterioration to the image based upon the size of image in connection with the storage capacity of a frame memory. A compressing section compresses decoded data based upon the optimal rate of compression and sends the compressed data to a predictive/display frame memory for storage. An expanding A section expands the compressed data based upon the optimal rate of compression and sends the expanded data to a decoding section when the expanded data is required.
    Type: Grant
    Filed: February 26, 1997
    Date of Patent: March 27, 2001
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hideo Ohira, Kenichi Asano, Toshiaki Shimada, Kohtaro Asai, Tokumichi Murakami
  • Image signal coding system
    Patent number: 6188794
    Abstract: An adaptive blocking coding system selects an effective blocking of an input image signal to be encoded in accordance with the correlation between fields, even if motion is detected between the fields. The blocking patterns include an individual field blocking, a non-interlace blocking, a split blocking and an inverted split blocking. Further, the coding system searches for motion from both odd and even fields of a frame for producing a motion compensated prediction signal in order to provide high-efficient coding.
    Type: Grant
    Filed: May 20, 1999
    Date of Patent: February 13, 2001
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hirofumi Nishikawa, Yoshihisa Yamada, Tokumichi Murakami, Kohtaro Asai
  • Image signal coding system
    Patent number: 6128345
    Abstract: An adaptive blocking coding system selects an effective blocking of an input image signal to be encoded in accordance with the correlation between fields, even if motion is detected between the fields. The blocking patterns include an individual field blocking, a non-interlace blocking, a split blocking and an inverted split blocking. Further, the coding system searches for motion from both odd and even fields of a frame for producing a motion compensated preduction signal in order to provide high-efficient coding.
    Type: Grant
    Filed: October 21, 1999
    Date of Patent: October 3, 2000
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Tokumichi Murakami, Kohtaro Asai, Hirofumi Nishikawa, Yoshihisa Yamada
  • Image signal coding system
    Patent number: 6097759
    Abstract: An adaptive blocking coding system selects an effective blocking of an input image signal to be encoded in accordance with the correlation between fields, even if motion is detected between the fields. The blocking patterns include an individual field blocking, a non-interlace blocking, a split blocking and an inverted split blocking. Further, the coding system searches for motion from both odd and even fields of a frame for producing a motion compensated prediction signal in order to provide high-efficient coding.
    Type: Grant
    Filed: November 22, 1999
    Date of Patent: August 1, 2000
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Tokumichi Murakami, Kohtaro Asai, Hirofumi Nishikawa, Yoshihisa Yamada
  • Video coding and decoding system and method
    Patent number: 6018366
    Abstract: A video encoder for quantizing format-transformed source input-pictures into quantized data, and for coding the quantized data into coded bitstream, for outputting the coded bitstream, comprises a plural-density format-transformer for transforming a source input-picture into a specific format-transformed source input-picture; and a detector for detecting a variation in one of a specific luminance and color difference signal, and for selecting the specific format-transformed source input-picture for input to the quantizer depending on the variation. A decoder having a corresponding configuration is also provided.
    Type: Grant
    Filed: December 12, 1996
    Date of Patent: January 25, 2000
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kohtaro Asai, Takahiro Fukuhara, Tokumichi Murakami
  • Image signal coding system
    Patent number: 6002439
    Abstract: An adaptive blocking coding system selects an effective blocking of an input image signal to be encoded in accordance with the correlation between fields, even if motion is detected between the fields. The blocking patterns include an individual field blocking, a non-interlace blocking, a split blocking and an inverted split blocking. Further, the coding system searches for motion from both odd and even fields of a frame for producing a motion.,compensated prediction signal in order to provide high-efficient coding.
    Type: Grant
    Filed: May 27, 1999
    Date of Patent: December 14, 1999
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Tokumichi Murakami, Kohtaro Asai, Hirofumi Nishikawa, Yoshihisa Yamada
  • Image signal coding system
    Patent number: 5990960
    Abstract: An adaptive blocking coding system selects an effective blocking of an input image signal to be encoded in accordance with the correlation between fields, even if motion is detected between the fields. The blocking patterns include an individual field blocking, a non-interlace blocking, a split blocking and an inverted split blocking. Further, the coding system searches for motion from both odd and even fields of a frame for producing a motion, compensated prediction signal in order to provide high-efficient coding.
    Type: Grant
    Filed: December 9, 1998
    Date of Patent: November 23, 1999
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Tokumichi Murakami, Kohtaro Asai, Hirofumi Nishikawa, Yoshihisa Yamada
  • Image signal coding system
    Patent number: 5970175
    Abstract: An adaptive blocking coding system selects an effective blocking of an input image signal to be encoded in accordance with the correlation between fields, even if motion is detected between the fields. The blocking patterns include an individual field blocking, a non-interlace blocking, a split blocking and an inverted split blocking. Further, the coding system searches for motion from both odd and even fields of a frame for producing a motion compensated prediction signal in order to provide high-efficient coding.
    Type: Grant
    Filed: October 26, 1998
    Date of Patent: October 19, 1999
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hirofumi Nishikawa, Yoshihisa Yamada, Tokumichi Murakami, Kohtaro Asai
  • Image signal coding system
    Patent number: 5963258
    Abstract: An adaptive blocking coding system selects an effective blocking of an input image signal to be encoded in accordance with the correlation between fields, even if motion is detected between the fields. The blocking patterns include an individual field blocking, a non-interlace blocking, a split blocking and an inverted split blocking. Further, the coding system searches for motion from both odd and even fields of a frame for producing a motion compensated prediction signal in order to provide high-efficient coding.
    Type: Grant
    Filed: July 31, 1998
    Date of Patent: October 5, 1999
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hirofumi Nishikawa, Yoshihisa Yamada, Tokumichi Murakami, Kohtaro Asai
  • Image signal coding system
    Patent number: 5949489
    Abstract: An adaptive blocking coding system selects an effective blocking of an input image signal to be encoded in accordance with the correlation between fields, even if motion is detected between the fields. The blocking patterns include an individual field blocking, a non-interlace blocking, a split blocking and an inverted split blocking. Further, the coding system searches for motion from both odd and even fields of a frame for producing a motion compensated prediction signal in order to provide high-efficient coding.
    Type: Grant
    Filed: July 31, 1998
    Date of Patent: September 7, 1999
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hirofumi Nishikawa, Yoshihisa Yamada, Tokumichi Murakami, Kohtaro Asai
  • Multimedia information processing system
    Patent number: 5930251
    Abstract: In a multimedia information processing system, a relay station comprises: transmission decoding section for reproducing a fixed packets stream from received transmission signal from a transmitter; signal change processing means for executing changing process for the fixed packets stream; and transmission coding section for producing a transmission signal corresponding to a characteristic of a transmission line from the fixed packets stream. The construction for exchanging signals between different transmission means is simplified. Thus, it is achieved to exchange contents of media between different transmission means by a simple construction.
    Type: Grant
    Filed: November 8, 1996
    Date of Patent: July 27, 1999
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Tokumichi Murakami, Kazuhiro Matsuzaki, Yoshiaki Kato, Hideo Ohira
  • Image encoding system
    Patent number: 5926574
    Abstract: In an image encoding system, an input image signal is blocked, the resultant blocks are transformed into two or more kinds of transformed coefficients, the transformed coefficients are quantized according to a given quantizing step size, the quantized transformed coefficients are scanned according to a plurality of scan sequences, the thus scanned coefficients are further encoded according to a plurality of encoding tables, and, out of combinations of the plurality of scan sequences with the plurality of encoding tables, a combination of a scan sequence with an encoding table which provides the highest encoding efficiency is selected by scan sequence and encoding table selector.
    Type: Grant
    Filed: August 29, 1996
    Date of Patent: July 20, 1999
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hirofumi Nishikawa, Takahiro Fukuhara, Kohtaro Asai, Tokumichi Murakami
  • Image signal coding system
    Patent number: 5867220
    Abstract: An adaptive blocking coding system selects an effective blocking of an input image signal to be encoded in accordance with the correlation between fields, even if motion is detected between the fields. The blocking patterns include an individual field blocking, a non-interlace blocking, a split blocking and an inverted split blocking. Further, the coding system searches for motion from both odd and even fields of a frame for producing a motion compensated prediction signal in order to provide high-efficient coding.
    Type: Grant
    Filed: February 20, 1997
    Date of Patent: February 2, 1999
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hirofumi Nishikawa, Yoshihisa Yamada, Tokumichi Murakami, Kohtaro Asai
  • Multimedia information processing apparatus
    Patent number: 5845089
    Abstract: A multimedia information processing apparatus comprises information source processing portions, element packet processing portions, packet processing portions, transmission path processing portions, an information source processing portion bus, an element packets processing bus and a packet multiplexing bus. A multimedia information processing apparatus is divided into a plurality of layers, and interface signals are defined between each processing portion and each processing is connected via buses. Contents such as broadcasting, communication and storage are secured by an editing unit comprised of a computer and by expansion of units via bus. Bus connection enables editing processing portions such as a complex processing portion including a plurality of processing portions and a computer to expand functions of a multimedia information processing apparatus.
    Type: Grant
    Filed: May 31, 1996
    Date of Patent: December 1, 1998
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hideo Ohira, Tokumichi Murakami, Yoshiaki Kato, Kazuhiro Matsuzaki