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代码实现
- 强调一下：主要是用到了
cv::imencode和cv::imdecode两个函数，具体的用法与cv::imread和cv::imwrite类似。 - 可参考opencv的相应API文档帮助理解：Image file reading and writing
#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <iostream>
void Jpegcompress(const cv::Mat& src, cv::Mat& dest, int quality)
{
std::vector<uchar> buff;
std::vector<int> params;
/*IMWRITE_JPEG_QUALITY For JPEG, it can be a quality from 0 to 100
(the higher is the better). Default value is 95 */
params.push_back(cv::IMWRITE_JPEG_QUALITY);
params.push_back(quality);
//将图像压缩编码到缓冲流区域
cv::imencode(".jpg", src, buff, params);
//将压缩后的缓冲流内容解码为Mat，进行后续的处理
dest = cv::imdecode(buff, -1);
cv::imshow("src", src);
cv::imshow("dst", dest);
}
int main()
{
std::string fileName = "test.jpg";
cv::Mat src = cv::imread(fileName, -1);
if (src.empty())
{
std::cerr<<" image open error!\n";
return 0;
}
cv::Mat dest;
Jpegcompress(src,dest,50);
cvWaitKey(0);
return 0;
}