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This article is the original article of CSDN blogger "hanging small", and the reprint has been approved by the original blogger. Original link: https://blog.csdn.net/m0_46988935/article/details/109234900  catalogue preface 1, What is Hough transform 2, Edge detection algorithm 3, Experimental environment 4, Traditional lane li ...

day1 - image reading, display and saving use OpenCV Development module, open a picture in the host directory, And displayed on the desktop Function: imread, imshow, namedWindow and imwrite functions in the highug module imread() reads the image Mat imread(const string& filename, int flags=1) parameterexplainfilenameRead file add ...

Hello, everyone. Today, I'd like to share with you how to use {MediaPipe+Opencv to control the movement and click of the computer mouse through gesture recognition. If you are interested, you can play games instead of the mouse. Let's see the effect first. Test with a drawing board The yellow box represents the range of the computer screen and ...

preface When deploying CV algorithm based on deep learning, almost all of them involve input image preprocessing. In python, the task of image preprocessing is basically contracted by numpy. But, when the deployment needs to be implemented in C + +, the problem arises: numpy cannot be used. How to convert the image into the format accept ...

principle We use machine learning to complete face detection, First, we need a large number of positive sample images (face images) and negative sample images (images without faces) to train the classifier. We need to extract features from them. The Haar feature in the figure below will be used, just like our convolution kernel. Each feature i ...

OpenCV image processing 1. Image threshold ret, dst = cv2.threshold(src, thresh, maxval, type) src: input image, only single channel image can be input, usually gray imagedst: output diagramthresh: thresholdmaxval: the value assigned when the pixel value exceeds the threshold (or is less than the threshold, depending on the type)Type: t ...

Color space RGB, RGBA, YUV (brightness, interpolation between red component and brightness signal, interpolation between blue and brightness), HSV (chroma, saturation, brightness)..... void cv::cvtColor ( InputArray src, OutputArray dst, int code, int dstCn = 0 ) // Data type conversion void cv::Mat::convertTo ( ...

Shape Detection Contour detection contours, hierarchy = cv2.findContours(image,mode,method) The first parameter input image,The second parameter represents the retrieval mode of contour, which has four types: 1.cv2.RETR_EXTERNAL means that only the outer contour is detected 2.cv2. RETR_ The contour detected by list does not establish a hiera ...

6.3 image coding technology and standard of Python image processing - wavelet transform coding 1 algorithm principle The so-called wavelet is small for Fourier waves, Fourier wave refers to sine wave (or cosine wave) that oscillates infinitely in time domain. Relatively speaking, wavelet refers to a wave with very concentrated energy in t ...

catalogue 1, Structural element 2, Swell 1. Principle 2. Dilation function 3. Code 4. Effect 3, Corrode 1. Principle 2. Corrosion function (erode) 3. Code 4. Effect 4, Simple operation - callback function and slider 1. Callback function 2. Slider creation 3. Code 4. Effect reference material 1, Structural element The ge ...