何为彩色图象皮肤区域的分割呢？简单点说就是把一张包含人体皮肤的彩色图片，经过处理后只显示皮肤区域，其它不相干的区域用其他颜色覆盖。这个一般应用到人脸识别和人体动作识别上，算的上是当今还比较热门的研究。
整个处理流程分为以下几步骤：
1、打开一幅彩色图象
2、将图象从RGB颜色模型转换到YCbCr颜色模型
3、然后在YCbCr颜色模型中进行皮肤相似度的计算
4、给图象赋值，皮肤区域赋1也就是白色，非皮肤区域赋0也就是黑色
5、将图象中赋1的区域提取还原成原来的色彩
这样就基本可以显示出来了，如下图：

以上只是个大概的处理过程，其中我还必须进行统计建模，计算出无数统计的皮肤图象的均值M和协方差C，然后用简单高斯模型计算出皮肤区域的分布。在肤色相似度的计算过程中涉及到一个阈值的选取，有些同学采用了一个自适应的阈值算法，无奈我看不懂那些算法而且自适应的效果也不好，所以我就选取了一篇相关论文上的固定阈值，反而我效果比较好

其中还有些细节问题，例如打开一幅非图象文件会进行报错提示，程序可以不按照顺序运行等等…

这里简单说一下为什么要将图象转换到YCbCr颜色模型下进行运算。Y代表的是图象的亮度，Cb和Cr是色度信息，在处理过程中不需要亮度，所以一般把Y省略不进行计算。该空间具有与人类视觉感知过程想类似的构成原理；YCbCr计算过程和空间表示比较简单，与RGB之前的换算是线形关系，避免了非线形空间的奇异性，因此有较高的计算效率；肤色在YCbCr色彩空间及其色度空间CbCr中聚类特性较好，YCbCr色彩空间是离散的，易于实现聚类算法。

这个程序是用Matlab写出来的，只有在Matlab中才能打开。点击 这里 下载源代码，其中 “.fig” 文件是图形文件 “.m” 是源程序，有用 Matlab 的同学可以拿去玩玩～ 虽然没啥实用效果～

zEUS.

日志评论

• 2008年, 十月 7日, 刘浏 writes: :arrow: MATLAB是一个相当强悍的平台.
• 2008年, 十月 7日, wayne writes: 有点意思, matlab那种东西从来都没敢碰过...
• 2008年, 十月 7日, zEUS. writes: 呵呵，要不是教学实习，我才不碰咧... :mrgreen:
• 2008年, 十月 7日, zEUS. writes: 确实很强悍，能做的事情相当多，特别是一些极其复杂的数学问题！ 不过毕业后我就把它从电脑里卸载掉了...
• 2008年, 十月 8日, simpleseo writes: 简单高斯模型计算 :shock: 兄弟，你是高科技人才，俺数学一踏糊涂 :grin:
• 2008年, 十月 8日, 抽筋儿 writes: 盘踞在俺XP和Ubuntu里的噩梦——matlab
• 2008年, 十月 8日, Yacca writes: 不好意思...完全没看懂...我是高数厌恶者...
• 2008年, 十月 8日, zEUS. writes: 哈哈，不懂没关系撒～ 这篇文章我只是放在博客上以表纪念...
• 2008年, 十月 8日, zEUS. writes: matlab 的个头超过了 WarCraft III ... 所以我大学一毕业就把它卸载了 :cool:
• 2008年, 十月 12日, IIREN writes: matlab是个相当好的东东 这图片选的也很实用... 教学实习的时候就用的这张?
• 2008年, 十月 13日, zEUS. writes: 恩，我当时是选的这张，不过老师会用其它的图片进行测试～
• 2008年, 十月 13日, IIREN writes: 牛的, 效果的确很好
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