ios - 如何在 iPhone 中检测眼睛瞳孔并测量瞳孔之间的距离

Question

我研究了很多关于人脸检测的例子，我还使用 CIDetector 和 HaarCascade_eye.xml 检测了 iPhone 中的眼睛。但是我想检测眼睛的瞳孔并想测量瞳孔之间的距离。请指导我一些事情，以便我可以做到这一点。

Answer 1

使用以下公式计算两点之间的距离:

这将获得两只眼睛的中心点(由 CIDetector 检测到)并比较它们的位置以输出您正在寻找的测量值。

if(faceFeature.hasLeftEyePosition && faceFeature.hasRightEyePosition)
{
    CGPoint leftEyeCenter = faceFeature.leftEyePosition;
    CGPoint rightEyeCenter = faceFeature.rightEyePosition;

    float simpleDistance = rightEyeCenter.x - leftEyeCenter.x;
    //This finds the distance simply by comparing the x coordinates of the two pupils

    float complexDistance = fabsf(sqrtf(powf(leftEyeCenter.y - rightEyeCenter.y, 2) + powf(rightEyeCenter.x - leftEyeCenter.x, 2)));
    //This will return the diagonal distance between the two pupils allowing for greater distance if the pupils are not perfectly level.       
}