13.蓝色占比

Mat image = Imgcodecs.imread("2023.jpg");
// 将RGB图像转换为HSV图像
        Mat hsvImage = new Mat();
        Imgproc.cvtColor(image, hsvImage, Imgproc.COLOR_BGR2HSV);

        // 计算蓝色的比例
        double blueRatio = 0;
        for (int y = 0; y < hsvImage.rows(); y++) {
            for (int x = 0; x < hsvImage.cols(); x++) {
                Scalar color = new Scalar(hsvImage.get(y, x));
                System.out.println("h:" + color.val[0] + " s:" + color.val[1] + " v:" + color.val[2]);
                boolean flag = color.val[0] >= 100 && color.val[1] <= 124 && color.val[2] >= 43;
                System.out.println("flag: "+flag);
                if (flag) { // 这个范围可以根据需要进行调整
                    blueRatio++;
                }
            }
        }
        double blueFraction = blueRatio / (hsvImage.rows() * hsvImage.cols()); // 转换为比例