Image processing apparatus and pattern extraction apparatus

• US 20060023940A1
• Filed: 09/29/2005
• Published: 02/02/2006
• Est. Priority Date: 12/09/1998
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Katsuyama, Yutaka
• Granted Patent: US 7,349,571 B2
• Time in Patent Office: Days
• US Class Current: 382/165
• CPC Class Codes: G06T 2207/10008 from scanner, fax or copier
• CPC Class Codes: G06T 2207/10024 Color image
• CPC Class Codes: G06T 2207/30176 Document
• CPC Class Codes: G06T 7/11 Region-based segmentation
• CPC Class Codes: G06T 7/136 involving thresholding
• CPC Class Codes: G06V 10/143 Sensing or illuminating at different wavelengths
• CPC Class Codes: G06V 30/414 Extracting the geometrical structure, e.g. layout tree; Block segmentation, e.g. bounding boxes for graphics or text

Abstract

A control unit selects a first labeling for a color image in a small number of colors so that the labeling is performed by clustering a color palette, and selects a second labeling for a color image in a large number of colors so that the labeling is performed by an adjacency expanding method.

Claims

1-37. -37. (canceled)

38. An image processing apparatus comprising:

unicolor area extraction means for extracting a unicolor area from an input image by comparing a predetermined first threshold with color information about the input image;

threshold computation means for computing a second threshold according to the color information about the unicolor area; and

unicolor area re-extraction means for re-extracting a unicolor area from the input image by comparing the second threshold with the color information about the input image.

39. A method of extracting a pattern for setting a threshold for use in extracting a unicolor area from a color image in consideration of color identification characteristics of a person.

40-46. -46. (canceled)