opencv中mat与jpeg相互转换及显示代码

#include "stdafx.h" #include "MatShowAndJPG2Mat.h" int ShowJPG(unsigned char *pData,int iDataLen,CWnd *pwnd) { //char strTmp[MAX_PARA_LEN]; CString strPath; IStream *pStm; IPicture *pPic; OLE_XSIZE_HIMETRIC hmWidth; OLE_YSIZE_HIMETRIC hmHeight; CDC* pDC; // int s32PicWidth; // int s32PicHeight; int x = 0; int y = 0; //CFileStatus fstatus; //CFile file; LPVOID pvData; ULONGLONG cb = iDataLen; HGLOBAL hGlobal; /************************************************ step2: 打开 jpeg 文件 m_apFileName[nId] *************************************************/ /* strPath.Format("C:/Users/teng/Pictures/4.jpg"); if (!file.Open(strPath,CFile::modeRead)) { AfxMessageBox("file has not found"); return -1; } if (!file.GetStatus(strPath, fstatus)) { AfxMessageBox("file status is not right"); return -1; } if ((cb =fstatus.m_size)<=0) { AfxMessageBox("file size is error"); return -1; } */ /************************************************ step3: 根据文件大小分配内存空间,记得释放内存 *************************************************/ hGlobal = GlobalAlloc(GMEM_MOVEABLE, (unsigned int)cb); if (hGlobal == NULL) { return -1; } /************************************************ step4: 锁定刚才分配的内存空间 *************************************************/ pvData = GlobalLock(hGlobal); if (pvData == NULL) { GlobalFree(hGlobal); // 记得释放内存 return -1; } /************************************************ step5: 将文件放到流中 *************************************************/ //file.Read(pvData,(unsigned int)cb); memcpy(pvData,pData,iDataLen); GlobalUnlock(hGlobal); CreateStreamOnHGlobal(hGlobal, TRUE, &pStm); /************************************************ step6: 从流中加载图片 (能显示jpeg图片和gif图片的一帧) *************************************************/ if(OleLoadPicture(pStm,(LONG)iDataLen,TRUE,IID_IPicture,(LPVOID*)&pPic)!=S_OK) { GlobalFree(hGlobal); // 记得释放内存 return -1; } /************************************************ step7: 获取图像宽和高,注意这里的宽和高不是图像的分辨率 *************************************************/ pPic->get_Width(&hmWidth); pPic->get_Height(&hmHeight); /************************************************ step8: use render function display image *************************************************/ //x = m_aCRectThumbNail[nId].left; //y = m_aCRectThumbNail[nId].top; //s32PicWidth = m_aCRectThumbNail[nId].right - m_aCRectThumbNail[nId].left; //s32PicHeight = m_aCRectThumbNail[nId].bottom - m_aCRectThumbNail[nId].top; CRect rect; pwnd->GetClientRect( &rect ); // 获取控件尺寸位置 pDC = pwnd->GetDC(); //pDC = g_dlg->GetDC(); //if(FAILED(pPic->Render(*pDC, x, y, s32PicWidth, s32PicHeight, 0, hmHeight, hmWidth, -hmHeight, NULL))) if(FAILED(pPic->Render(*pDC, 0, 0, rect.Width(),rect.Height(), 0, hmHeight, hmWidth, -hmHeight, NULL))) { pwnd->ReleaseDC(pDC); pPic->Release(); GlobalFree(hGlobal); // 记得释放内存 return -1; } CPen *penXY = new CPen(PS_SOLID, 0, RGB(255, 0, 0)); CPen *pOldPen = pDC->SelectObject(penXY); pDC->MoveTo(int(rect.Width()/2.0-50),int(rect.Height()/2.0)); pDC->LineTo(int(rect.Width()/2.0+50),int(rect.Height()/2.0)); pDC->MoveTo(int(rect.Width()/2.0),int(rect.Height()/2.0 - 50)); pDC->LineTo(int(rect.Width()/2.0),int(rect.Height()/2.0 + 50)); pDC->SelectObject(pOldPen); delete penXY; if (NULL != hGlobal) { GlobalFree(hGlobal); // 记得释放内存 } pwnd->ReleaseDC(pDC); pPic->Release(); return 0; } IplImage* Jpeg2Ipl(const uchar *jpegData, int jpegSize) { IplImage *_pImg = 0; struct jpeg_error_mgr jerr; struct jpeg_decompress_struct cinfo; cinfo.err = jpeg_std_error(&jerr); jpeg_create_decompress(&cinfo); //jpeg_stdio_mem_src(&cinfo, (char *)jpegData, jpegSize); jpeg_mem_src(&cinfo, jpegData, jpegSize); jpeg_read_header(&cinfo, TRUE); jpeg_start_decompress(&cinfo); int nRowSize = cinfo.output_width * cinfo.output_components; int w =cinfo.output_width; int h =cinfo.output_height; char *bmpBuffer = (char*)malloc(h*w*3); JSAMPARRAY pBuffer = (*cinfo.mem->alloc_sarray)((j_common_ptr) &cinfo, JPOOL_IMAGE, nRowSize, 1); while(cinfo.output_scanline < cinfo.output_height) { jpeg_read_scanlines(&cinfo, pBuffer, 1); int start=nRowSize*(cinfo.output_scanline-1); memcpy(bmpBuffer+start, pBuffer[0],nRowSize); /*for(int i=0;i<nRowSize;i++) { bmpBuffer[start+i]=pBuffer[0][i]; }*/ } jpeg_finish_decompress(&cinfo); jpeg_destroy_decompress(&cinfo); _pImg = cvCreateImage(cvSize(w,h),8,3); for (h=0; h<_pImg->height; h++) { for (w=0; w<_pImg->widthStep; w+=3) { *(_pImg->imageData+h*_pImg->widthStep+w+0)=*(bmpBuffer+h*_pImg->widthStep+w+2); *(_pImg->imageData+h*_pImg->widthStep+w+1)=*(bmpBuffer+h*_pImg->widthStep+w+1); *(_pImg->imageData+h*_pImg->widthStep+w+2)=*(bmpBuffer+h*_pImg->widthStep+w+0); } } //memcpy(_pImg->imageData,bmpBuffer,h*w*3); //Mat m(_pImg); //cvCvtColor(bmpBuffer,_pImg,CV_RGB2BGR); free(bmpBuffer); bmpBuffer=NULL; return _pImg; } Mat Jpeg2Mat(const uchar *jpegData, int jpegSize) { struct jpeg_error_mgr jerr; struct jpeg_decompress_struct cinfo; cinfo.err = jpeg_std_error(&jerr); jpeg_create_decompress(&cinfo); jpeg_mem_src(&cinfo, jpegData, jpegSize); jpeg_read_header(&cinfo, TRUE); jpeg_start_decompress(&cinfo); int nRowSize = cinfo.output_width * cinfo.output_components; int w =cinfo.output_width; int h =cinfo.output_height; char *bmpBuffer = (char*)malloc(h*w*3); JSAMPARRAY pBuffer = (*cinfo.mem->alloc_sarray)((j_common_ptr) &cinfo, JPOOL_IMAGE, nRowSize, 1); while(cinfo.output_scanline < cinfo.output_height) { jpeg_read_scanlines(&cinfo, pBuffer, 1); int start=nRowSize*(cinfo.output_scanline-1); memcpy(bmpBuffer+start, pBuffer[0],nRowSize); } jpeg_finish_decompress(&cinfo); jpeg_destroy_decompress(&cinfo); Mat mMat(h, w, CV_8UC3,bmpBuffer); Mat m(h, w, CV_8UC3, cv::Scalar(0,0,255)); cvtColor(mMat, m, COLOR_RGB2BGR); free(bmpBuffer); bmpBuffer=NULL; return m; } void showMatImgToWnd(CWnd* pWnd, const cv::Mat& img) { if(img.empty()) return; static BITMAPINFO *bitMapinfo = NULL; static bool First=TRUE; if(First) { BYTE *bitBuffer = new BYTE[40+4*256];//开辟一个内存区域 if(bitBuffer == NULL) { return; } First=FALSE; memset(bitBuffer, 0, 40+4*256); bitMapinfo = (BITMAPINFO *)bitBuffer; bitMapinfo->bmiHeader.biSize = sizeof(BITMAPINFOHEADER); bitMapinfo->bmiHeader.biPlanes = 1; for(int i=0; i<256; i++) { //颜色的取值范围 (0-255) bitMapinfo->bmiColors[i].rgbBlue =bitMapinfo->bmiColors[i].rgbGreen = bitMapinfo->bmiColors[i].rgbRed =(BYTE) i; } } bitMapinfo->bmiHeader.biHeight = -img.rows; bitMapinfo->bmiHeader.biWidth = img.cols; bitMapinfo->bmiHeader.biBitCount= img.channels() *8; CRect drect; pWnd->GetClientRect(drect); //pWnd指向CWnd类的一个指针 CClientDC dc(pWnd); HDC hDC =dc.GetSafeHdc(); //HDC是Windows的一种数据类型，是设备描述句柄； SetStretchBltMode(hDC, COLORONCOLOR); StretchDIBits(hDC,0,0, drect.right, //显示窗口宽度 drect.bottom, //显示窗口高度 0, 0, img.cols, //图像宽度 img.rows, //图像高度 img.data, bitMapinfo, DIB_RGB_COLORS, SRCCOPY ); } unsigned char *g_buff = new unsigned char[102400]; int g_iBuffLen = 0; bool g_bNetConnected = false; CCriticalSection g_cs; typedef struct _Data_Head { uint32_t iCommand; uint32_t iDataLen; uint32_t iRoomId; } DataHead; int CanReceive(int fd,int p_iUsec) { fd_set rf; struct timeval tox; FD_ZERO(&rf); FD_SET(fd, &rf); int i = p_iUsec / 100