png图像无损保存
png图像无损保存std::vector<int> compression_params;
compression_params.push_back(CV_IMWRITE_PNG_COMPRESSION);
compression_params.push_back(0); // 无压缩png.
compression_params.push_back(cv::IMWRITE_PNG_STRATEGY);
compression_params.push_back(cv::IMWRITE_PNG_STRATEGY_DEFAULT);
cv::imwrite("test.png", rgb_image, compression_params);如果CV_IMWRITE_PNG_COMPRESSION报错的话，试试IMWRITE_PNG_COMPRESSION
参考：
【1】OPencv无损保存图片
【2】opencv imwrite()函数保存png格式的图像
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