Title:
【発明の名称】画像符号化装置
Document Type and Number:
Japanese Patent JP2800633
Kind Code:
B2
Abstract:
A one-block extracting section extracts a pixel block from an input image signal. An area judging section calculates characteristic quantities such as variance information, histogram information and dynamic range information, and judges whether the pixel block is photographic or text-like based on the characteristic quantities. A photographic pixel block is coded by a transform coding section, and a text-like pixel block is coded by a block truncation coding section.
Inventors:
Kazuhiro Suzuki
Yutaka Koshi
Uesawa Isao
Yutaka Koshi
Uesawa Isao
Application Number:
JP12829793A
Publication Date:
September 21, 1998
Filing Date:
April 30, 1993
Export Citation:
Assignee:
Fuji Xerox Co., Ltd
International Classes:
H03M7/30; G06T9/00; H04N1/40; H04N1/41; H04N19/00; H04N19/12; H04N19/136; H04N19/157; H04N19/176; H04N19/189; H04N19/196; H04N19/46; H04N19/48; H04N19/60; H04N19/625; H04N19/70; H04N19/85; H04N19/90; (IPC1-7): H04N7/24; H04N1/40; H04N1/41
Domestic Patent References:
| JP6238667A | ||||
| JP583374A | ||||
| JP1112377A | ||||
| JP63185168A |
Attorney, Agent or Firm:
Yasuo Ishii (1 outside)