The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 02, 2007
Filed:
Apr. 17, 2003
Tetsuomi Tanaka, Kanagawa, JP;
Takeshi Yamazaki, Kanagawa, JP;
Tetsuomi Tanaka, Kanagawa, JP;
Takeshi Yamazaki, Kanagawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
There are provided an image coding method and apparatus and image compression method and apparatus which can properly compress a color document image with a high compression efficiency. First of all, a color reduction processing unit () converts each pixel of a color document image into an index assigned in correspondence with a color value, and generates color information () containing the number of pixels for each indexed color and an index color image (). A color information sort unit () and the like determine, for example, a color value corresponding to an index of the maximum number of pixels as a background color. An order determination unit () determines an order. A binary image generation compression unit () generates a partial binary image for each index and compresses the binary image according to the order. A data integrating unit () generates compressed image () by integrating background data () and the compressed data of the partial binary image.