feat(samples): add OpenCVDemo

Author: zjykzj

samples/OpenCVDemo/.clang-format

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+AlwaysBreakTemplateDeclarations: Yes
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+BreakConstructorInitializers: BeforeColon
+BreakInheritanceList: BeforeColon
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+CompactNamespaces: false
+ContinuationIndentWidth: 4
+IndentCaseLabels: true
+IndentPPDirectives: None
+IndentWidth: 2
+KeepEmptyLinesAtTheStartOfBlocks: true
+MaxEmptyLinesToKeep: 1
+NamespaceIndentation: None
+ObjCSpaceAfterProperty: false
+ObjCSpaceBeforeProtocolList: false
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+SpacesInCStyleCastParentheses: false
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+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+TabWidth: 4
+UseTab: Never

samples/OpenCVDemo/3rdparty/opencv

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+/home/zj/opencv/opencv-4.9.0/install_Release

samples/OpenCVDemo/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.24)
+project(OpenCVDemo)
+
+set(CMAKE_CXX_STANDARD 17)
+
+# set opencv
+get_filename_component(ABSOLUTE_OpenCV_DIR ./3rdparty/opencv ABSOLUTE)
+IF (CMAKE_SYSTEM_NAME MATCHES "Linux")
+    set(OpenCV_DIR ${ABSOLUTE_OpenCV_DIR}/lib/cmake/opencv4)
+ELSEIF (CMAKE_SYSTEM_NAME MATCHES "Windows")
+    set(OpenCV_DIR ${ABSOLUTE_OpenCV_DIR})
+ENDIF ()
+find_package(OpenCV REQUIRED)
+
+MESSAGE("OpenCV version: ${OpenCV_VERSION}")
+MESSAGE("OpenCV OpenCV_INCLUDE_DIRS: ${OpenCV_INCLUDE_DIRS}")
+MESSAGE("OpenCV OpenCV_LIBS: ${OpenCV_LIBS}")
+
+
+add_executable(OpenCVDemo main.cpp)
+target_link_libraries(OpenCVDemo ${OpenCV_LIBS})

samples/OpenCVDemo/cropped_lena.jpg

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+#include <iostream>
+
+#include "opencv2/opencv.hpp"
+
+int main() {
+  // 读取图片
+  cv::Mat image = cv::imread("../lena.jpg");
+  if (image.empty()) {
+    std::cout << "无法读取图片，请确保文件路径正确" << std::endl;
+    return -1;
+  }
+
+  // 获取图片的尺寸
+  int width = image.cols;
+  int height = image.rows;
+
+  // 计算中心裁剪的区域
+  int x = width / 4;          // 裁剪区域的左上角 x 坐标
+  int y = height / 4;         // 裁剪区域的左上角 y 坐标
+  int cropWidth = width / 2;  // 裁剪区域的宽度
+  int cropHeight = height / 2;// 裁剪区域的高度
+
+  // 裁剪图片
+  cv::Rect cropRegion(x, y, cropWidth, cropHeight);
+  cv::Mat croppedImage = image(cropRegion);
+
+  // 显示原始图片和裁剪后的图片
+  cv::imshow("原始图片", image);
+  cv::imshow("裁剪后的图片", croppedImage);
+  cv::waitKey(0);
+
+  // 保存裁剪后的图片
+  cv::imwrite("../cropped_lena.jpg", croppedImage);
+
+  std::cout << "Hello, World!" << std::endl;
+  return 0;
+}