main.cpp：
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <linux/fb.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <getopt.h>
#include <drm/drm_fourcc.h>
#include <string>
#include "opencv2/core.hpp"
#include "opencv2/imgproc.hpp"
#include "opencv2/highgui.hpp"
#include "opencv2/videoio.hpp"
#include <iostream>
#include <opencv2/opencv.hpp>
using namespace std;
int main(int argc, char **argv)
{
?? ?char* input_path_2 = argv[1];
?? ?cv::Mat img = cv::imread(input_path_2);
?? ?cv::Mat result = img.clone();
??? ?cv::putText(result, "hello", cv::Point(10, 40), cv::FONT_HERSHEY_PLAIN, 3, cv::Scalar(0, 0, 255, 255), 3);
?? ?int x1 = 0;
?? ?int y1 = 0;
?? ?int x2 = 100;
?? ?int y2 = 100;
?? ?cv::Mat region = result(cv::Range(y1,y2), cv::Range(x1,x2));
?? ?cv::Mat dst;
?? ?int resize_width = 200;
?? ?int resize_height = 300;
?? ?cv::resize(region, dst, cv::Size(resize_width, resize_height), 0, 0, cv::INTER_LINEAR);
?? ?//cv::namedWindow("my view", CV_WINDOW_NORMAL);
?? ?//cv::moveWindow("my view", 0, 0);
?? ?//cv::resizeWindow("my view",100, 100);
?? ?cv::imshow("my view", dst);
?? ?vector<int> compression_params;
?? ?compression_params.push_back(CV_IMWRITE_JPEG_QUALITY);? //选择jpeg
?? ?compression_params.push_back(100);
?? ?cv::imwrite("dst.jpg",dst,compression_params);
?? ?int keypressed = cv::waitKey(0);
??? return 0;
}
CMakeLists.txt：
# cmake needs this line
cmake_minimum_required(VERSION 2.8)
# Define project name
project(opencv_example_project)
# Find OpenCV, you may need to set OpenCV_DIR variable
# to the absolute path to the directory containing OpenCVConfig.cmake file
# via the command line or GUI
find_package(OpenCV REQUIRED)
# If the package has been found, several variables will
# be set, you can find the full list with descriptions
# in the OpenCVConfig.cmake file.
# Print some message showing some of them
message(STATUS "OpenCV library status:")
message(STATUS "??? version: ${OpenCV_VERSION}")
message(STATUS "??? libraries: ${OpenCV_LIBS}")
message(STATUS "??? include path: ${OpenCV_INCLUDE_DIRS}")
if(CMAKE_VERSION VERSION_LESS "2.8.11")
? # Add OpenCV headers location to your include paths
? include_directories(${OpenCV_INCLUDE_DIRS})
endif()
# Declare the executable target built from your sources
add_executable(opencv_crop_resize main.cpp)
# Link your application with OpenCV libraries
target_link_libraries(opencv_crop_resize ${OpenCV_LIBS})
