1
Tadayoshi Nakayama, Ken Ichi Ohta, Hidefumi Osawa, Shinichi Kato, Naoki Ito: Image processing apparatus and method for compression-encoding image area information. Canon Kabushiki Kaisha, Fitzpatrick Cella Harper & Scinto, August 14, 2007: US07257264 (37 worldwide citation)

From inputted multilevel image data it is generated, for each pixel, image area information constituted by an image area component indicating whether the pixel exists in a character•line drawing area or halftone area and an image area component indicating whether the pixel is chromatic or achromatic ...


2
Tadayoshi Nakayama, Yoshinobu Mita, Hidefumi Osawa: Image compression by arithmetic coding with learning limit. Canon Kabushiki Kaisha, Fitzpatrick Cella Harper & Scinto, November 16, 1999: US05986594 (37 worldwide citation)

Disclosed are an image processing method and apparatus whereby the capability of coding/decoding processing accompanied by learning is improved, this also making it possible to achieve high-speed image formation processing without error. The apparatus includes a coder for generating coded data by ar ...


3
Hidefumi Osawa: Image processing apparatus and method using lossless encoding of a difference between image blocks. Canon Kabushiki Kaisha, Fitzpatrick Cella Harper & Scinto, March 24, 1998: US05732157 (33 worldwide citation)

This invention has as its object to provide an image coding method which can efficiently encode image data by fully utilizing a two-dimensional correlation of an image. A block matching means searches for a block position corresponding to a minimum absolute value sum of differences of a pixel block ...


4
Naoki Ito, Tadayoshi Nakayama, Ken ichi Ohta, Hidefumi Osawa, Shinichi Kato: Image processing apparatus and method which compresses image data of each region using a selected encoding method. Canon Kabushiki Kaisha, Fitzpatrick Cella Harper & Scinto, March 20, 2007: US07194140 (31 worldwide citation)

This invention has as its object to provide an image processing apparatus, which can obviate the need for image re-input, can effectively generate encoded data that falls within a set size, and can minimize deterioration of image quality. To this end, an image processing apparatus according to this ...


5
Mamoru Sato, Hidefumi Osawa: Image encoding apparatus and method. Canon Kabushiki Kaisha, Fitzpatrick Cella Harper & Scinto, March 28, 1995: US05402248 (23 worldwide citation)

An image processing apparatus is provided which can shape codes and omit buffers at a decoding side as well as omit an image memory at an encoding side by providing code buffers for respective encoders. An image encoding apparatus for encoding image information in a hierarchical form includes encode ...


6
Hidefumi Osawa, Yasuo Fukuda: Object similarity calculation method and apparatus. Canon Kabushiki Kaisha, Fitzpatrick Cella Harper & Scinto, September 9, 2003: US06618501 (23 worldwide citation)

Although methods employing chain codes or Fourier descriptors are known for calculating an outline similarity between a model image and an object image, these methods are difficult to achieve detection of both an approximate similarity and local similarity. In view of this, according to the present ...


7
Xiaoyan Dai, Hidefumi Osawa: Image processing method and apparatus. Canon Kabushiki Kaisha, Fitzpatrick Cella Harper & Scinto, November 24, 2009: US07623712 (21 worldwide citation)

Disclosed is an image processing apparatus in which vector data from which noise has been removed and amount of data reduced can be generated in ideal fashion with regard to an illustration area selected from a document image. The document image is input to the apparatus and is segmented into a plur ...


8
Ken ichi Ohta, Tadayoshi Nakayama, Hidefumi Osawa, Shinichi Kato, Naoki Ito: Image processing apparatus and control method for inputting image data and encoding the data. Canon Kabushiki Kaisha, Fitzpatrick Cella Harper & Scinto, September 12, 2006: US07106911 (20 worldwide citation)

An image input through an input unit is compressed by an encoding unit and stored in first and second memories. A first counter counts the data in its code amount. When the amount of encoded data generated reaches a predetermined size, an encoding sequence control unit sets quantization steps in the ...


9
Hidefumi Osawa, Yasuhiko Yasuda, Shigeo Kato: Image encoding method and apparatus providing variable length bit stream signals. Canon Kabushiki Kaisha, Fitzpatrick Cella Harper & Scinto, May 31, 1994: US05317428 (18 worldwide citation)

There is provided an image encoding method in a facsimile apparatus or an image filing apparatus as an image communication apparatus. In this method, a color image signal which is expressed by a plurality of color component signals to be encoded is input, the input color image signal is converted in ...


10
Hidefumi Osawa, Yoshinobu Mita, Tadayoshi Nakayama, Ken Onodera: Image processing apparatus and method. Canon Kabushiki Kaisha, Fitzpatrick Cella Harper & Scinto, April 22, 2003: US06552819 (18 worldwide citation)

An analyzer estimates the time for rendering image data based on the number, types, etc., of rendering commands, stored in an intermediate memory, and determines whether or not there is a possibility of overrun. If there is the possibility of overrun, image data of respective bands formed in a band ...