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1, Principle 1. Internal code The internal code of Chinese characters refers to the code that represents a Chinese character in the computer. The internal code is slightly different from the location code. As mentioned above, the area code and bit code of Chinese location code are between 1 ~ 94. If the location code is directly used as t ...

11. HighGUI GUI Creation and use of 11.1 slider bar 11.1,1 Create slider: createTrackbar() function The createTrackbar function creates a slider bar that can adjust values: int cv::createTrackbar(const cv::String &trackbarname, const cv::String &winname, int *value, int count, cv::TrackbarCallback onChange = (cv::TrackbarCallback)0, ...

preface This article will use OpenCV C + + for QR code detection. 1, QR code detection Firstly, we must preprocess the image and extract the image contour through gray, filtering, binarization and other operations. Here I also added morphological operations to eliminate noise and effectively connect rectangular areas. Mat gray; cvt ...

Reference link: how to configure OpenCV on CLion- Don't know, don't hit the answer. - know https://www.zhihu.com/question/47331502/answer/166576437 Environment: windows 10 professional version 64bit + MinGW 3.22 + cmake 3.8.1 (cmake version should be a newer version, such as this version) + clion 2017.1 (my clion2021.2.3) + opencv3.20 (it can ...

Usually, when extracting the contour of an object, there is noise in the image, and the extraction effect is not ideal. As shown in the following figure, Extract code: import cv2 img = cv2.imread("mouse.png") cv2.imshow("origin",img) gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY) ret,binary = cv2.threshold(gray,128,255,cv2.THRESH_BINARY) cv2. ...

preface By learning opencv image library programming, learn how to complete a comprehensive program design with the help of third-party library functions. 1, Know OpenCV Open source computer vision (OpenCV) is a programming function library mainly for real-time computer vision. The application fields of OpenCV include: 2D and 3D feature ...

Original Link:http://www.juzicode.com/opencv-python-image-gradient Return to the Opencv-Python tutorial Gaussian smoothing, bilateral smoothing And Mean Smoothing, Median Smoothing The smoothing described can be seen as a "low-pass filter" of the image, which filters out the "high frequency" part of the image to make it ...

1. Basic: image encryption and decryption based on XOR operation Generally, the process of image encryption and decryption is realized by bitwise XOR operation. The encryption can be realized by bitwise XOR between the original image and the key image, and the decryption process can be realized by bitwise XOR between the encrypted image and th ...

Working principle of the algorithm: Initially, the user draws a rectangle around the foreground area (the foreground area should be completely located in the rectangular part). Then, the algorithm will segment it iteratively to obtain the best result. Done, but in some cases, the segmentation may not be good. For example, some foreground areas ...

OpenCV provides two kinds of transformation functions, cv2.warpAffine and cv2.warpsperspective. The first is affine transformation function and the second is perspective transformation function. The first received parameter is 2x3 transformation matrix, and the second received parameter is 3x3 transformation matrix. Extended zoom Extended sca ...