Mat HistCalculate(Mat img) {Mat img_dect = img;img_dect.at<Vec3b>(0, 0)[0];//獲得圖像大小int width = img_dect.cols;int hight = img_dect.rows;//統計直方圖數據分別累加每個顏色值的數量float B[256] = { 0.0 };float G[256] = { 0.0 };float R[256] = { 0.0 };for (int i = 0; i < width; i++) {for (int j = 0; j < hight; j++){int b = img_dect.at<Vec3b>(j, i)[0];int g = img_dect.at<Vec3b>(j, i)[1];int r = img_dect.at<Vec3b>(j, i)[2];B[b] += 1;G[g] += 1;R[r] += 1;}}//找到B G R中元素數量歸一化float b_max = 0;float g_max = 0;float r_max = 0;//找最大元素for (int i = 0; i < 255; i++) {if (B[i] > b_max)b_max = B[i];if (G[i] > g_max) {g_max = G[i];}if (R[i] > r_max) {r_max = R[i];}}//除以最大元素歸一化for (int i = 0; i < 255; i++) {B[i] = 100 * B[i] / b_max;G[i] = 100 * G[i] / g_max;R[i] = 100 * R[i] / r_max;}//創建一張空白圖展示直方圖數據Mat Hist = Mat(256, 256, CV_8UC3, Scalar(255, 255, 255));//在直方圖數值上的像素用對應三原色表示，注意y軸變換for (int i = 0; i < 256; i++) {line(Hist, Point(i, 255 - B[i]), Point(i + 1, 255 - B[i + 1]), Scalar(255, 0, 0), 1, LINE_AA);line(Hist, Point(i, 255 - G[i]), Point(i + 1, 255 - G[i + 1]), Scalar(0, 255, 0), 1, LINE_AA);line(Hist, Point(i, 255 - R[i]), Point(i + 1, 255 - R[i + 1]), Scalar(0, 0, 255), 1, LINE_AA);}return Hist; }

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