Title:
HIGH PRESSURE COMPRESSION METHOD AND DEVICE FOR GRAPHIC SYSTEM
Document Type and Number:
Japanese Patent JP3280067
Kind Code:
B2
Abstract:
PURPOSE: To reduce the influence of an artificial structure of compression due to the compression for a graphic image having a high space frequency component.
CONSTITUTION: A layout 50 includes a text detector 62 which detects the cells 54 of a source image 52 that is liable to generate an artificial structure of compression when each cell 54 is compressed by a compressor 58 to be stored in a compressed image storage part 60. The detector 62 generates a bit table in a text detection/storage part 64 of each cell 54 including a high space frequency component. When a compressed image is expanded by an expander 66, the cells 54 pass through a pixel saturator 68. If a cell 54 is equal to a 'text' cell that is referred to in the part 64, the saturator 68 saturates all pixels of the text cell in the color of a prescribed color set. Then the expanded image is stored again in an image storage part 70.
Inventors:
Kia Silva Brook
James Robert Met Calf
James Robert Met Calf
Application Number:
JP14029392A
Publication Date:
April 30, 2002
Filing Date:
June 01, 1992
Export Citation:
Assignee:
Canon Inc
International Classes:
G06T9/00; H04N1/409; H04N1/41; H04N1/64; H04N7/30; H04N19/60; (IPC1-7): H04N1/41; H04N1/409; H04N7/30
Domestic Patent References:
| JP62234466A | ||||
| JP62230276A | ||||
| JP410765A | ||||
| JP4277979A |
Other References:
【文献】加藤洋一、大久保栄,ポストフィルタリングによる高能率符号化画像品質の改善,1989年電子情報通信学会秋季全国大会講演論文集(6),日本,電子情報通信学会,6.63
Attorney, Agent or Firm:
Yasunori Otsuka (1 person outside)
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