Add json library from nlohmann's github repository

OpenCV_test/test7_threshold/.vscode/settings.json

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+{
+    "C_Cpp.default.configurationProvider": "ms-vscode.cmake-tools"
+}

OpenCV_test/test7_threshold/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.0.0)
+project(OpenCV_test6 VERSION 1.0.0)
+
+#Find the opencv package
+find_package(OpenCV REQUIRED)
+
+#include directories for opencv
+include_directories(${OpenCV_INCLUDE_DIRS})
+
+add_executable(${PROJECT_NAME} main.cpp)
+
+#Add command to generate .gitignore
+add_custom_command(TARGET ${PROJECT_NAME} 
+                   COMMAND echo \"*\" > ${CMAKE_BINARY_DIR}/.gitignore
+                   COMMAND echo \"**/*\" > ${CMAKE_BINARY_DIR}/.hgignore)
+
+#Add OpenCV Libraries
+target_link_libraries(${PROJECT_NAME} ${OpenCV_LIBS})

OpenCV_test/test7_threshold/main.cpp

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+#include <opencv2/opencv.hpp>
+#include <iostream>
+
+using namespace cv;
+
+int main(int argc, char **argv)
+{
+    std::string filename;
+    Mat image, gray_image, thre_image;
+    int brightless = 0;
+
+    // Get Filename
+    std::cout << "Input Filename:";
+    std::cin >> filename;
+
+    // Load the image
+    if (filename != "")
+    {
+        image = imread(filename, IMREAD_COLOR);
+        if (image.empty())
+        {
+            std::cout << "Failed to open the image!" << std::endl;
+            return -1;
+        }
+    }
+
+    // Convert the image to HSV color and filter the background color
+    cvtColor(image, gray_image, COLOR_BGR2GRAY);
+    namedWindow("Original Image", WINDOW_AUTOSIZE);
+    imshow("Original Image", image);
+    namedWindow("Gray Image", WINDOW_AUTOSIZE);
+    imshow("Gray Image", gray_image);
+
+    // Use cv::thershold to convert
+    threshold(gray_image, thre_image, 0, 255, THRESH_BINARY|THRESH_OTSU);
+    namedWindow("OTSU Threshold", WINDOW_AUTOSIZE);
+    imwrite("/dev/shm/test.png", thre_image);
+    imshow("OTSU Threshold", thre_image);
+    
+    while (1)
+    {
+        int c = waitKey(1);
+        if (c != -1)
+        {
+            std::cout << c << std::endl;
+        }
+        if (c == 27)
+        {
+            break;
+        }
+    }
+
+    destroyAllWindows();
+    return 0;
+}

OpenCV_test/test8_random_color/.vscode/settings.json

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+{
+    "C_Cpp.default.configurationProvider": "ms-vscode.cmake-tools"
+}

OpenCV_test/test8_random_color/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.0.0)
+project(OpenCV_test8 VERSION 1.0.0)
+
+#Find the opencv package
+find_package(OpenCV REQUIRED)
+
+#include directories for opencv
+include_directories(${OpenCV_INCLUDE_DIRS})
+
+add_executable(${PROJECT_NAME} main.cpp)
+
+#Add command to generate .gitignore
+add_custom_command(TARGET ${PROJECT_NAME} 
+                   COMMAND echo \"*\" > ${CMAKE_BINARY_DIR}/.gitignore
+                   COMMAND echo \"**/*\" > ${CMAKE_BINARY_DIR}/.hgignore)
+
+#Add OpenCV Libraries
+target_link_libraries(${PROJECT_NAME} ${OpenCV_LIBS})

OpenCV_test/test8_random_color/main.cpp

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+#include <opencv2/opencv.hpp>
+#include <iostream>
+
+using namespace cv;
+
+int main(int argc, char **argv)
+{
+    Mat canvas = Mat::zeros(512, 512, CV_8UC3);
+    RNG rng1(12345);
+    int w = canvas.cols;
+    int h = canvas.rows;
+    namedWindow("Color test", WINDOW_AUTOSIZE);
+    
+    while (1)
+    {
+        int c = waitKey(30);
+        if (c != -1)
+        {
+            std::cout << c << std::endl;
+        }
+        if (c == 27)
+        {
+            break;
+        }
+        // Clear the canvas
+        canvas = Scalar(0,0,0);
+        
+        // Get position and color
+        int x1 = rng1.uniform(0,w);
+        int y1 = rng1.uniform(0,h);
+        int x2 = rng1.uniform(0,w);
+        int y2 = rng1.uniform(0,h);
+        int r = rng1.uniform(0,255);
+        int g = rng1.uniform(0,255);
+        int b = rng1.uniform(0,255);
+
+        // Draw lines
+        line(canvas, Point(x1, y1), Point(x2, y2), Scalar(r,g,b), 2, LINE_AA, 0);
+        imshow("Color test", canvas);
+    }
+
+    destroyAllWindows();
+    return 0;
+}

clean_cache.sh

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+# Put it at your home dir
+
+# Visual Studio Code Caches
+rm -rf .config/Code/User/workspaceStorage
+rm -rf .cache/vscode-cpptools/ipch
+
+# yay caches
+rm -rf .cache/yay/*
+rm -rf .local/share/flatpak/*
+
+# cache generated by wine QQ
+rm -rf '文档/Tencent Files'