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7. Image outline 7.1 what is image contour Image outline is a curve of continuous points with the same color or gray scale Contour is very useful in shape analysis and object detection and recognition. Function of contour: For graphic analysisObject recognition and detection Note: In order to improve the accuracy of detection, it is neces ...

Thank Enpei for the complete implementation of the project and open source the code for everyone to exchange and learn. 1, Project introduction The final effect of this project is gesture control and mouse operation. As shown below   The project is implemented in python and calls opencv, mediapipe, python and other libraries. It consists ...

[OpenCV complete routine] 90 Frequency domain notch filter Welcome to pay attention "100 complete OpenCV routines" Series, continuously updating Welcome to pay attention "Python Xiaobai's OpenCV learning course" Series, continuously updating 5.2 Notch Filter Notch filter blocks or passes through the frequency in th ...

Detailed explanation of histogram back projection algorithm concept Back projection is a method to calculate the coincidence degree between pixels and pixels in the specified histogram model. In short, it is to first calculate the histogram model of a feature, and then use the model to find the feature in the image. For example, you have a hu ...

OpenCV3.4.6 installation package (including contrib): https://pan.baidu.com/s/1KBD-fAO63p0s5ANYa5XcEQ Extraction code: p7j0resources: https://pan.baidu.com/s/1nkQ6iVV7IeeP4gTXvM_DyQ Extraction code: ypvt Chapter1 reading pictures / videos / cameras Read picture from file modularfunctionimgcodecsImage file reading and writingimgprocI ...

1, Basic function usage 1. Usage of argparse 1.1 Use the argparse module to create an ArgumentParser parsing object, which can be understood as a container that will contain all the information required to parse the command line into Python data types. ap = argparse.ArgumentParser()#It can be understood as a container that will contain a ...

Image operation Image addition The image can be added by the plus operator "+" or CV2 The add() function adds the image. The sum obtained is likely to exceed 255. The above two different addition operation methods have different processing methods for values exceeding 255. Plus operator "mod(a+b, 256)" means cal ...

Introduction: This paper presents a simple and reliable algorithm to estimate the video background. For the video with fixed lens, which contains a small number of moving objects, the background image of the image can be obtained by median filtering. With the help of inter frame difference, the mask of moving objects in the image can be ob ...

Original address Global Thrust is a very powerful library of various cuda acceleration algorithms. However, thrust is designed for vector rather than tilt matrix. The following tutorial discusses how to wrap cv::cuda::GpuMat into a thrust iterator that can be used for thrust algorithms. This tutorial will show you how to: Wrap GpuMat in a t ...

12. Image smoothing 12.1 objectives Learn: - blur images with various low-pass filters - apply custom filters to images (2D convolution) 12.2 # 2D convolution (image filtering) Like the one-dimensional signal, various low-pass filters (LPF) and high pass filters (HPF) can also be used to filter the image. LPF helps to eliminate noise and blu ...