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Color gamut analysis based image partition method and system

A technology of image segmentation and color gamut, applied in the field of image processing

Active Publication Date: 2013-06-05
PEKING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This makes it impossible to completely separate the mixed color parts of one color from other colors

Method used

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  • Color gamut analysis based image partition method and system
  • Color gamut analysis based image partition method and system
  • Color gamut analysis based image partition method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0105] Such as Image 6 As shown, suppose we want to select the green color mixing area in the picture.

[0106] 1. First, the pure green in the image is used as the target color and recorded as F, and the RGB value is (121, 157, 66). Then analyze the image point by point to judge whether each point is a mixed color of other colors and the target color.

[0107] Assume that the color of the current point p (the position marked in the red box in the schematic diagram) is marked as C, and the RGB value is (141, 163, 91). The values ​​of its neighbor points are shown in the table below:

[0108]

[0109] (1) In this embodiment, an analysis window with a radius of 2 pixels is selected, and the radius range of the analysis window may be [2, 15]. RGB values ​​of all pixels in the statistical analysis window. Select points close to the RGB value of the current point, and record this point set as N. Judgment method can be calculated If di , G i , B i ) belongs to the point...

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Abstract

The invention discloses a color gamut analysis based image partition method and system, relating to the technical field of image processing. The image partition method in the prior art is to partition an image only by depending on a distance defined in the color space as a basis rather than considering a color mixture condition of a color gamut. The method and system disclosed by the invention realize the partition of a region with mixed color points by judging whether a current pixel point is a mixed color point mixed by a target color and other colors, setting an initial background color value and a color mixing proportion for each pixel point of the image, and then calculating the background color value H (Rh, Gh and Bh) and the color mixing proportion a of the mixed color point. The method and system disclosed by the invention also can partition pixel points which have a great color difference from the target color based on the color gamut analysis, so that an object containing the target color can be partitioned from the image more exactly for the subsequent treatment.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to an image segmentation method and system based on color gamut analysis. Background technique [0002] All current image segmentation methods are based on the color difference defined in a certain color space, combined with specific rules such as domain information to segment the image. Such a basic idea cannot completely separate the desired regions in many cases. Currently, no image segmentation method that takes color mixing into account exists. Retouchers avoid changing a color that has a gradient into another color. For example, in an image that transitions from red to blue. If the target color is red, it is impossible to accurately segment pixels close to blue with existing image segmentation methods. But in fact, the color near blue is also obtained by mixing a small amount of red and blue. Therefore, the existing image segmentation methods do not consi...

Claims

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Application Information

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IPC IPC(8): G06T5/00G06T7/40
Inventor 袁梦尤张轶君李平立
Owner PEKING UNIV