Programmer Think

1. Preface This case is an online learning course purchased a long time ago. Recently, when I suddenly think of it, I realize to record it. Today, with the gradual flow of deep learning, the application of HOG+SVM custom object recognition may not be very large, but in a fixed scene, if the size of custom objects in the image is relatively con ...

1, Gradient processing of image 1. Sobel operator Gradient can be calculated according to the x direction or y direction. In fact, it depends on the difference and change of pixel points, such as the junction of black-and-white objects. The difference of pixel value change is very large. The function used for gradient calculation is called Sobe ...

33.OpenCV face detection and recognition - face recognition preface   face recognition is to further judge a person's identity on the basis of face detection.   OpenCV provides three face recognition methods: eigenfaces, Fisherfaces and Local Binary Patterns Histograms (LBPH). 1, Eigenfaces face recognition    ...

Python Xiaobai's topic report - actual combat of OpenCV matting project (4) This series is Python Xiaobai's task "image segmentation and matting based on OpenCV". It should be noted that this series is not a matting project tutorial of OpenCV, but a topic report on this topic. It includes a relatively complete PyQt project. From t ...

1. opecv reading and displaying images Reading and displaying images is the simplest and most basic operation in opencv. Although it can be implemented using only two simple API s, there are some small details that should be paid attention to` #include<opencv2/opencv.hpp> using namespace std; using namespace cv; int main() { Mat s ...

1. Use Opencv to read and save images 1.1 image reading The imread() and imshow() functions need to be used for Opencv reading and display. You can use Opencv to read and display the specified picture by using the following code: import cv2 as cv #Import opencv and name it cv img = cv.imread('cat.jpg',-1) #Read the specified picture cv. ...

Q1 channel switching 1.1 leading knowledge 1. imread() reads of CV2 are arranged in BGR order; 2. The gray image of single channel is represented by two-dimensional gray matrix: height * width; 3. The representation method of three channel color image is three-dimensional BGR/RGB matrix: height * width * channel; 4. In order to facilitate pro ...

0x00 overview of ideas The overall logic of the program is to recognize your face and save count (counter) pictures of your face, then exit, or press q while running. There are two important cycles 1. Call camera loop continuously ----- while true 2. Process the function of each face recognized by the recognition function ----- for xywh i ...

How to write this series of columns This series of column writing will adopt the first question and answer writing form to quickly let you learn the primary, intermediate and advanced knowledge of OpenCV. 5. Detailed description of slider in Python opencv and solutions to common problems The use scenarios of slider in OpenCV related cases ar ...

The whole process: cmake configuration and generation - > VS compilation generation and installer - > Reconfigure opencv/include/libraries / additional dependencies 1, Preliminary preparation opencv github homepage address: https://github.com/opencv/ visual studio 2019 – windows10 x64 is installed by default Download openc ...