Mat imageText = img.clone(); // Write text using putText() function putText(imageText, "This is a black silk beauty!", Point(50,350), FONT_HERSHEY_COMPLEX, 1.5, Scalar(250,225,100)); imshow("Text on Image", imageText); waitKey(0); 1. 2. 3. 4. 5. 6....
So, if we need to preserve the original image for some reason, we can simply copy it and write the text on the copy. This post explains how to copy an image. 1 cv2.putText(img, "My text", (0, 30), cv2.FONT_HERSHEY_SIMPLEX, 1.0, (0, 0, 0), 4) Now that we have drawn ...
@param text the text you want to write on the image 输入文字 @param rotate the angle of rotation; negative <0,270°; zero =0,180°; positive >0,90°. 旋转角度,<0 逆时针旋转90°;>0 顺时针旋转90°;=0 旋转180° **/ void putTextRotate(cv::Mat &img, const cv::Point2f /*&left...
frame=cap.read()#读取图像(frame就是读取的视频帧,对frame处理就是对整个视频的处理)#ret是判断读取是否成功,成功为1,失败为0gray=cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)#将RGB图转为GRAY图out.write(frame)# 保存录像结果
// writePng.cpp : 定义控制台应用程序的入口点。 // int run_test_png(Mat &mat,string image_name) { /*采用自己设置的参数来保存图片*/ //Mat mat(480, 640, CV_8UC4); //createAlphaMat(mat); vector<int> compression_params; compression_params.push_back(CV_IMWRITE_PNG_COMPRESSION); ...
2.1 cv::putText() 这是OpenCV中主要文字绘制方法,它可以简单的在图像上绘制一些文字。 代码语言:javascript 复制 voidcv::putText(cv::Mat&img,// Image to be drawn onconststring&text,// write this (often from cv::format)cv::Point origin,// Upper-left corner of text boxint fontFace,// Fon...
# Load an color imageingrayscale img=cv2.imread('messi5.jpg',0) 第二个参数是要告诉函数应该如何读取这幅图片。 • cv2.IMREAD_COLOR:读入一副彩色图像。图像的透明度会被忽略, 这是默认参数。 • cv2.IMREAD_GRAYSCALE:以灰度模式读入图像 • cv2.IMREAD_UNCHANGED:读入一幅图像,并且包括图像的 alph...
write(frame) if cv.waitKey(1) & 0xFF == ord('q'): break # When everything done, release the capture cap.release() out.release() cv.destroyAllWindows() 读取视频文件 def read_video(): cap = cv.VideoCapture('output.avi') while cap.isOpened(): res, frame = cap.read() if not...
How to put a text in an image in OpenCV using C - In OpenCV, we can put some text in the image by using puttext() function. This function is defined in header. To put text in an image, we first need to declare the matrix which will load the image.Inste
We can use theputText()function of OpenCV to put text on an image with our desired color, font size, font family, and location. The first argument of theputText()function is the image we want to put the text. The second argument is the text (string) we want to put on the image....