色彩空间变换

void QuickDemo::colorSpace_Demo(Mat &image) {Mat gray, hsv;cvtColor(image, hsv, COLOR_BGR2HSV);//rgb->hsv// H 0 ~ 180, S, V cvtColor(image, gray, COLOR_BGR2GRAY);//rgb->grayimshow("HSV", hsv);imshow("灰度", gray);//灰度空间// imwrite("D:/hsv.png", hsv);// imwrite("D:/gray.png", gray);
}

 图像的创建，克隆，赋值

void QuickDemo::mat_creation_demo() {// Mat m1, m2;// m1 = image.clone();// image.copyTo(m2);// 创建空白图像Mat m3 = Mat::zeros(Size(8, 8), CV_8UC3);//八位unchar三通道，8*3*8数组m3 = Scalar(0, 0, 255);//赋值操作std::cout << "width: " << m3.cols << " height: " << m3.rows << " channels: "<<m3.channels()<< std::endl;// std::cout << m3 << std::endl;Mat m4;m3.copyTo(m4);m4 = Scalar(0, 255, 255);imshow("图像", m3);imshow("图像4", m4);
}

 像素点操作

image.at<uchar>(row, col);对应坐标像素值

image.ptr<uchar>(row);行首像素指针

void QuickDemo::pixel_visit_demo(Mat &image) {int w = image.cols;//列宽int h = image.rows;//行高int dims = image.channels();//通道数//数组操作
/*for (int row = 0; row < h; row++) {for (int col = 0; col < w; col++) {if (dims == 1) { // 灰度图像int pv = image.at<uchar>(row, col);image.at<uchar>(row, col) = 255 - pv;}if (dims == 3) { // 彩色图像Vec3b bgr = image.at<Vec3b>(row, col);image.at<Vec3b>(row, col)[0] = 255 - bgr[0];image.at<Vec3b>(row, col)[1] = 255 - bgr[1];image.at<Vec3b>(row, col)[2] = 255 - bgr[2];}}}
*/
//指针操作for (int row = 0; row < h; row++) {uchar* current_row = image.ptr<uchar>(row);for (int col = 0; col < w; col++) {if (dims == 1) { // 灰度图像int pv = *current_row;*current_row++ = 255 - pv;}if (dims == 3) { // 彩色图像*current_row++ = 255 - *current_row;*current_row++ = 255 - *current_row;*current_row++ = 255 - *current_row;}}}imshow("像素读写演示", image);
}