opencv imdecode和imencode用法

主要是對內存數據自動編解碼

string fname = "D:/image.jpg"; //! 以二進制流方式讀取圖片到內存 FILE* pFile = fopen(fname.c_str(), "rb"); fseek(pFile, 0, SEEK_END); long lSize = ftell(pFile); rewind(pFile); char* pData = new char[lSize]; fread(pData, sizeof(char), lSize, pFile); fclose(pFile); 
 //! 解碼內存數據，變成cv::Mat數據 cv::Mat img_decode; vector<uchar> data; for (int i = 0; i < lSize; ++i){ data.push_back(pData[i]); } img_decode = cv::imdecode(data, CV_LOAD_IMAGE_COLOR); cv::flip(img_decode, img_decode, -1); img_decode.channels(); 
 //! 將cv::Mat數據編碼成數據流 vector<unsigned char> img_encode; cv::imencode(".jpg", img_decode, img_encode); unsigned char *encode_data = new unsigned char[lSize]; for (int i = 0; i<lSize; i++){ encode_data[i] = img_encode[i]; }