OpenCV函数compression_params.push_back报错：未定义标识符 CV_IMWRITE_PNG_COMPRESSION

Question

头文件包含了了，环境配置步骤也重新看了一遍。

vector<int> compression_params;
    compression_params.push_back(CV_IMWRITE_PNG_COMPRESSION);
    compression_params.push_back(9);//从0-9较高的值意味着更小的尺寸和更长的压缩时间而默认值是3.
    string fitness_str = to_string(pop[max_scallop.first].fit_value), generation_str = to_string(generation);
    string str = "C:\\Visual Studio 2017 Projects\\GA\\GA\\第" + generation_str + "代最优扇贝" + fitness_str + ".png";
    imwrite(str, dst_image, compression_params);

Answer 1

 
vector<int> compression_params;
    compression_params.push_back(16/*CV_IMWRITE_PNG_COMPRESSION*/);
    compression_params.push_back(9);//从0-9较高的值意味着更小的尺寸和更长的压缩时间而默认值是3.
    string fitness_str = to_string(pop[max_scallop.first].fit_value), generation_str = to_string(generation);
    string str = "C:\\Visual Studio 2017 Projects\\GA\\GA\\第" + generation_str + "代最优扇贝" + fitness_str + ".png";
    imwrite(str, dst_image, compression_params);