Function blendIris

jni/venus/region_operation.cpp:1370–1425

}

void blendIris(cv::Mat& image, const cv::Mat& iris, const std::vector<cv::Point2f>& points, float amount)
{
	// iris right index 42�� left index 43
	const int iris_indices_r[] = {35, 37, 39, 41};
	const int iris_indices_l[] = {45, 47, 49, 51};
	float iris_radius_r = distance(points[42], points[iris_indices_r[0]]);
	for(size_t i = 1; i < NELEM(iris_indices_r); ++i)
	{
		float dist = distance(points[42], points[iris_indices_r[i]]);
		if(iris_radius_r > dist)
			iris_radius_r = dist;
	}
				
	float iris_radius_l = distance(points[43], points[iris_indices_l[0]]);
	for(size_t i = 1; i < NELEM(iris_indices_l); ++i)
	{
		float dist = distance(points[43], points[iris_indices_l[i]]);
		if(iris_radius_l > dist)
			iris_radius_l = dist;
	}

	cv::Mat iris2;
	if(iris.channels() == 3)
		cvtColor(iris, iris2, CV_BGR2BGRA);
	iris2.convertTo(iris2, CV_32FC4, 1/255.0);

	const Vec3f FROM_COLOR(1.0f, 1.0f, 1.0f);  // white
	for(int r = 0; r < iris2.rows; ++r)
	for(int c = 0; c < iris2.cols; ++c)
	{
		Vec4f& color = iris2.at<Vec4f>(r, c);
		color = venus::color2alpha(color, FROM_COLOR);
	}
	iris2.convertTo(iris2, CV_8UC4, 255.0);
//	cv::imwrite("color2alpha.png", iris2);

	// TODO it seems this value fit every iris image in res/drawable/
	const float iris_image_radius = (84.0f - 12.0f)/2;

	Mat iris_r, iris_l;
	float iris_ratio_r = iris_radius_r / iris_image_radius;
	float iris_ratio_l = iris_radius_l / iris_image_radius;
	cv::resize(iris2, iris_r, Size(), iris_ratio_r, iris_ratio_r);
	cv::resize(iris2, iris_l, Size(), iris_ratio_l, iris_ratio_l);

	const Point2f& iris_center_r = points[42];
	const Point2f& iris_center_l = points[43];
	Point2i iris_position_r(iris_center_r.x - (iris_r.cols >> 1), iris_center_r.y - (iris_r.rows >> 1));
	Point2i iris_position_l(iris_center_l.x - (iris_l.cols >> 1), iris_center_l.y - (iris_l.rows >> 1));

	RoiInfo eye_info_r = calcuateEyeRegionInfo_r(points);
	RoiInfo eye_info_l = calcuateEyeRegionInfo_l(points);

	blend(iris_r, image, eye_info_r.mask, iris_position_r, amount);
	blend(iris_l, image, eye_info_l.mask, iris_position_l, amount);
}

cv::Mat resize(const cv::Mat& image, const Point2f& pivot,