1
Kimihiko Kazui, Akira Nakagawa, Eishi Morimatsu: Apparatus and method for interframe predictive video coding and decoding with capabilities to avoid rounding error accumulation. Fujitsu, Staas & Halsey, August 28, 2001: US06282243 (145 worldwide citation)

A method and apparatus for interframe predictive video coding and decoding which avoid the accumulation of rounding errors and thus obtain high-quality reproduced pictures. A frame memory outputs at least one reference picture to a prediction picture calculation unit, according to motion vector info ...


2
Akira Nakagawa, Kimihiko Kazui, Eishi Morimatsu, Takahiro Shimizu: Video coding apparatus and decoding apparatus. Fujitsu, Staas & Halsey, August 15, 2000: US06104434 (109 worldwide citation)

Video coding apparatus and decoding apparatus capable of reproducing decoded pictures without introducing unwanted noises, even if any considerable difference in pixel values or discontinuity exists at a certain block boundary. In a video coding apparatus employing predictive techniques, a dequantiz ...


3
Akira Nakagawa, Kimihiko Kazui, Atsuko Tada, Eishi Morimatsu, Koich Tanaka: Method of watermark-embedding/extracting identification information into/from picture data and apparatus thereof, and computer readable medium. Fujitsu, Staas & Halsey, August 15, 2000: US06104826 (37 worldwide citation)

The present invention relates to methods for watermark-embedding/extracting identification information into/from picture data and apparatuses thereof. When identification information is watermark-embedded, the following steps are performed. Combinations of basis functions orthogonal each other are g ...


4
Akira Nakagawa, Kimihiko Kazui, Eishi Morimatsu, Takahiro Shimizu: Video coding apparatus and decoding apparatus. Fujitsu, Staas & Halsey, December 25, 2001: US06333949 (28 worldwide citation)

Video coding apparatus and decoding apparatus capable of reproducing decoded pictures without introducing unwanted noises, even if any considerable difference in pixel values or discontinuity exists at a certain block boundary. In a video coding apparatus employing predictive techniques, a dequantiz ...


5
Kimihiko Kazui, Eishi Morimatsu: Scene change detecting device. Fujitsu, Staas & Halsey, June 24, 1997: US05642174 (24 worldwide citation)

A scene change detecting device of a relatively small circuit scale is capable of accurately detecting a scene change using data which have already been compressed and coded. The scene change detecting device has an extracting circuit for extracting frame type information, frame identification infor ...


6
Akira Nakagawa, Kimihiko Kazui, Eishi Morimatsu, Takahiro Shimizu: Video coding apparatus. Fujitsu, Staas & Halsey, September 8, 1998: US05805222 (22 worldwide citation)

A video coding apparatus for performing predictive coding of digital video input signals. The apparatus employs a resolution selection controller that selects picture resolution to be used in coding of a source picture of a current frame, according to coding information in a previous frame. Such cod ...


7
Kimihiko Kazui, Akira Nakagawa, Eishi Morimatsu: Moving-picture coding device employing intra-frame coding and inter-frame coding. Fujitsu, October 20, 1998: US05825425 (19 worldwide citation)

A device for coding moving pictures includes a coding unit for applying intra-frame coding or inter-frame coding to the of blocks dividing each frame of the moving pictures. The device further includes a refresh-operation-control unit for controlling the coding unit to carry out the intra-frame codi ...


8
Katsuki Miyawaki, Yukio Otobe, Kimihiko Kazui, Hideki Miyasaka, Yasunori Ueno, Kouji Maruyama: Method controlling memory access operations by changing respective priorities thereof, based on a situation of the memory, and a system and an integrated circuit implementing the method. Fujitsu, Staas & Halsey, May 12, 1998: US05752266 (10 worldwide citation)

Control operations to access a memory changes respective priorities of the operations depending on the situation of the memory, and the operations are arbitrated and scheduled according to the respective, changed priorities, in order to avoid concentration on or rejection of a specific memory access ...


9
Akira Nakagawa, Kimihiko Kazui, Eishi Morimatsu: Moving picture encoding system and method. Fujitsu, Staas & Halsey, February 15, 2000: US06025880 (10 worldwide citation)

A moving picture encoding system. There is provided a moving picture encoding system and method for changing the resolution of an original picture that is an object of encoding using a proper criterion, and encoding the picture while preventing deterioration of picture quality. A motion prediction/c ...


10
Akira Nakagawa, Kimihiko Kazui: Inverse discrete cosine transform apparatus. Fujitsu, Helfgott & Karas P C, April 7, 1998: US05737256 (8 worldwide citation)

An 8-point inverse discrete cosine transform (IDCT) is decomposed into four 2-point IDCTs. The four 2-point IDCTs are implemented by four parallel-operating product-sum computing circuits. Each product-sum computing circuit comprises a single multiplying means and accomplishes computation of eight p ...