IC697ALG445
IC697ALG445
通过已获得的样本来判断人脸的位置,选取合适的人脸,截取出做样本是重要的步骤。人脸特征定位与特征提取质量的好坏对于人脸图像识别效果有直接的影响。首先确定人眼的坐标(x1,y1)和(x2,y2),由此可间接得到正方形人脸的左上顶点和右下顶点的坐标,设其分别为(X1,Y1)和(X2,Y2),其详细计算方法如下所示
式中,RH和RV均为经验常数,在设计过程中将其分别取值为2.0和3.5。如此可在原图中得到人脸的区域座标,其尺寸随眼距Widtheyes的大小而变化,但是作为PCA的输入,要求输入样本的维数相同,所以必须对图片进行归一化处理。在设计中将所得人脸区域样本均缩放至24×24。此外还需要对图片进行对比度调节和直方图均衡等操作,以提高识别的准确性。
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