openCV uninstall The source code of openCV after installation should be retained as much as possible, because the installed openCV can be uninstalled directly from the build folder. Reference link: Visual Learning Notes 10 – Uninstallation, installation and multi-version management of opencv If you have installed openCV and want to reinstall it later, you need […]
Tag: opencv
Call opencv library programming to display pictures and student ID names under Ubuntu
Article directory 1. Principle of Chinese character dot matrix font library (1), Chinese character encoding 1. Location code 2. Internal code (2) Dot matrix font structure 1. Bitmap font storage 2. 16*16 dot matrix font library 3. 1414 and 1212 dot matrix fonts (3). Acquisition of Chinese character lattice 1. Use location code to obtain […]
Call opencv library programming under Ubuntu to display a picture and display characters
? 1. Internal code, location code encoding rules and glyph data storage format of Chinese characters The in-machine code, location code encoding rules and glyph data storage format of Chinese characters are concepts related to Chinese character information processing. Here is a brief description: 1. Internal code: Internal code is the binary encoding used internally […]
Use opencv to correct image distortion
1 Affine transformation 1.1 What is affine transformation In image processing, it is often necessary to perform various operations on images, such as translation, scaling, rotation, flipping, etc., which are all affine transformations of images. Image affine transformation, also known as image affine mapping, means that in geometry, a vector space is transformed into another […]
Qt + OpenCV + Halcon + QScintilla implement Halcon’s script engine function (source code)
Foreword In the industrial field, the application of functions such as defect detection and target counting is basically a matter of trial and error. There is no specific standard. Standard modules for the functions can be realized by standardizing the input and output interfaces and replacing the process with a script engine. 1. Qt + […]
Computer Vision: Using opencv to realize bank card number recognition
1 Overview 1.1 Opencv introduction OpenCV is the abbreviation of Open Source Computer Vision Library. It was proposed and established by Intel in 1999 and is now supported by Willow Garage. It is a highly open source computer vision library that can implement Windows, Linux, Cross-platform operation on Mac and other platforms. opencv is an […]
java opencv4.8.0 text recognition
Tools import java.io.IOException; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import java.util.ArrayList; import java.util.List; import org.opencv.core.Mat; import org.opencv.core.MatOfPoint; import org.opencv.core.MatOfPoint2f; import org.opencv.core.Point; import org.opencv.core.Scalar; import org.opencv.core.Size; import org.opencv.dnn.TextDetectionModel_DB; import org.opencv.dnn.TextRecognitionModel; import org.opencv.highgui.HighGui; import org.opencv.highgui.ImageWindow; import org.opencv.imgproc.Imgproc; public class OpencvUtil {<!– –> \t static String textRecognition(Mat mat, Size inputSize1) {<!– –> Path path = Paths.get(“src”,”main”,”resources”,”text_recognition_CRNN_CH_2023feb_fp16.onnx”); System.out.println(path.toAbsolutePath()); TextRecognitionModel […]
Call opencv library programming to display pictures and student ID names under Ubuntu
Article directory 1. Principle of Chinese character dot matrix font library (1), Chinese character encoding 1. Location code 2. Internal code (2) Dot matrix font structure 1. Bitmap font storage 2. 16*16 dot matrix font library 3. 14*14 and 12*12 dot matrix fonts (3). Acquisition of Chinese character lattice 1. Use location code to obtain […]
I am learning OpenCV color space conversion in Vscode
Article directory color 【1】Color space (color gamut) (1) **RGB color space** Conversion to xyz color space Convert RGB color space to XYZ color space Convert XYZ color space to RGB color space (2) **CMYK color space** (3) **HSV** (**Hue, Saturation, Value**) color space (4) **YUV and YCbCr color space** 【2】Color space conversion 2.1 GRAY color […]
C# OpenCvSharp corn kernel counting
Effect Project Code using OpenCvSharp; using System; using System.Drawing; using System.Text; using System.Windows.Forms; namespace OpenCvSharp_Demo { public partial class frmMain : Form { public frmMain() { InitializeComponent(); } string fileFilter = “*.*|*.bmp;*.jpg;*.jpeg;*.tiff;*.tiff;*.png”; string image_path = “”; DateTime dt1 = DateTime.Now; DateTime dt2 = DateTime.Now; Mat image; Mat result_image; StringBuilder sb = new StringBuilder(); private void […]