保存图像数据为字节文件

将OpenCV Mat结构中的data数组保存为字节文件

关键

1. 字节文件的读写；
2. unsigned char *和char *的转换

实现

#include "opencv2/opencv.hpp"
#include <iostream>
#include <fstream>

using namespace cv;
using namespace std;

void bin_write() {
    std::string img_path = "../lena.jpg";
    cv::Mat img = cv::imread(img_path, cv::IMREAD_COLOR);

    std::ofstream file;
    file.open("lena_512w_512h.bin", std::ios::out | std::ios::binary);

    long length = img.rows * img.cols * img.channels();
    file.write(reinterpret_cast<const char *>(img.data), length);
    file.close();
}

void bin_read() {
    cv::Mat img(512, 512, CV_8UC3);
    long length = img.rows * img.cols * img.channels();

    std::string bin_path = "lena_512w_512h.bin";
    std::ifstream file;
    file.open(bin_path, std::ios::in | std::ios::binary);

    file.read(reinterpret_cast<char *>(img.data), length);
    file.close();

    cv::imshow("img", img);
    cv::waitKey(0);
}