# US 2010/0166310 A1 · Method of establishing skin color model

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- Number: US 2010/0166310 A1
- Document ID: US20100166310A1
- Status: Published application
- Kind: A1
- Application number: 12/424,750
- Filed: 2009-04-16
- Published: 2010-07-01
- Earliest claimed: 2008-12-31
- Assignees: Altek Corporation
- Inventors: CHEN HUNG CHAN; HONG LONG CHOU
- Web page: https://patentgrep.com/patent/US20100166310A1

## CPC

- G06V 40/162: {using pixel segmentation or colour matching}
- G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING

## Abstract

A method of establishing a skin color model includes the following steps. A human face detecting procedure is performed on an input image, and a human face area in the input image is circled through a selecting window. A skin color model is established by using a Gaussian probability distribution function (PDF) according to color information in the selecting window. When the skin color model established in the above step is applied to skin color detection, pixels having the skin color in the input image are detected through the skin color model and a Mahalanobis distance computing procedure.

## Claims

### Claim 1

A method of establishing a skin color model, adapted to perform a skin color detection on an input image by using a skin color model, the method comprising:
performing a human face detecting procedure on the input image, and circling a human face area in the input image through a selecting window;
establishing a skin color model according to color information in the selecting window; and
performing a skin color detecting procedure, so as to detect remaining pixels having the skin color in the input image according to the skin color model.

### Claim 2 (depends on 1)

The method of establishing a skin color model according to claim 1, wherein the step of establishing the skin color model further comprises:
executing a Gaussian probability distribution procedure, so as to analyze a skin color distribution of the human face image in the selecting window;
setting a skin color threshold, and selecting a plurality of skin color pixels satisfying the skin color threshold from the selecting window; and
establishing the skin color model according to the skin color pixels.

### Claim 3 (depends on 2)

The method of establishing a skin color model according to claim 2, wherein before the step of executing the Gaussian probability distribution procedure, the method further comprises:
converting the input image to a brightness image, a blue chroma image, and a red chroma image; and
generating a color distribution table for a part of the blue chroma image and a part of the red chroma image corresponding to the selecting window.

### Claim 4 (depends on 1)

The method of establishing a skin color model according to claim 1, wherein the step of performing the skin color detecting procedure further comprises:
loading a Mahalanobis distance processing procedure; and
detecting the remaining pixels having the skin color in the input image according to the skin color model and the Mahalanobis distance processing procedure.