[計(jì)算機(jī)軟件及應(yīng)用]LearningOpenCV課后答案
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1、 The Learning of OpenCV Here contains just the exercises in book "Learning OpenCV" and of course I believe there is better solution for them. problems: 1. If you set cvSetImageCOI, dont forget to set it back with parameter "0", otherwise you may end up with single channel.
2、2. If you get your IplImage from "cvCapture", then do NOT release it as it is not created by you! 3. There is some memory allocation in "cvSubImageHeader, and do NOT forget to release them. 4. I tried to erase my drawing lines by "xor" it again, but it seems not working by using "cvGetRow". Maybe
3、 it is because I mess up with "cvSetImageROI without reset it. So, I just use cvCopy to overwrite it. 5. When you draw your rectangle of some width of line, be careful that the rectangle is bigger than that width of line. 6. The color sequence in bytes order is "BGR". The following are exercis
4、es in chapter 4.
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
#include
5、
#include
6、har buffer[256]; int winX = 0, winY = 0; if (bMouseButtonDown) { winX = x; winY = y; sprintf(buffer, "mouse click at [%d,%d]", x, y); cvPutText(pImage, buffer, cvPoint(winX, winY), &myfont, cvScalar(255,0,0)); } } void myMouseCallback(int event, int myx, int myy, int flag, vo
7、id* pUser) { switch (event) { case CV_EVENT_LBUTTONDOWN: bMouseButtonDown = true; x = myx; y = myy; break; case CV_EVENT_LBUTTONUP: bMouseButtonDown = false; break; } } void exercise1() { char* szVideoName = "e:\\mytest.avi"; char* szWindowName = "my video";
8、char* szGrayName = "gray image"; char* szCannyName = "canny image"; CvCapture* pCapture = NULL; IplImage* pImage = NULL; IplImage* pGrayImg = NULL; IplImage* pCannyImg = NULL; IplImage* pCombineImg = NULL; IplImage* pSub1= NULL; IplImage* pSub2= NULL; IplImage* pSub3= NULL; int
9、 nWidth = 0, nHeight = 0; cvNamedWindow(szWindowName); cvNamedWindow(szGrayName); cvNamedWindow(szCannyName); cvNamedWindow(szCombineName); pCapture = cvCreateFileCapture(szVideoName); if (pCapture) { nWidth = (int) cvGetCaptureProperty(pCapture, CV_CAP_PROP_FRAME_WIDTH);
10、 nHeight = (int) cvGetCaptureProperty(pCapture, CV_CAP_PROP_FRAME_HEIGHT); pGrayImg = cvCreateImage(cvSize(nWidth, nHeight), 8, 1); pCannyImg = cvCreateImage(cvSize(nWidth, nHeight), 8, 1); pCombineImg = cvCreateImage(cvSize(nWidth, 3*nHeight), 8, 1); pSub1 = cvCreateImageHeader(cvSize
11、(nWidth, nHeight), 8, 1); pSub2 = cvCreateImageHeader(cvSize(nWidth, nHeight), 8, 1); pSub3 = cvCreateImageHeader(cvSize(nWidth, nHeight), 8, 1); pSub1->origin = pCombineImg->origin; pSub2->origin = pCombineImg->origin; pSub3->origin = pCombineImg->origin; pSub1->widthStep =
12、pCombineImg->widthStep; pSub2->widthStep = pCombineImg->widthStep; pSub3->widthStep = pCombineImg->widthStep; pSub1->imageData = pCombineImg->imageData; pSub2->imageData = pCombineImg->imageData + nHeight*pCombineImg->widthStep; pSub3->imageData = pCombineImg->imageData + nHeigh
13、t*2*pCombineImg->widthStep; cvSetMouseCallback(szCombineName, myMouseCallback, pCombineImg); //cvResizeWindow(szCombineName, pCombineImg->width, pCombineImg->height); do { if (cvWaitKey(15) == 27) { break; } pImage = cvQueryFrame(pCapture); if (pImage)
14、 { cvConvertImage(pImage, pGrayImg, 0); cvCanny(pGrayImg, pCannyImg, 1, 2, 5); //cvShowImage(szWindowName, pImage); //cvShowImage(szGrayName, pGrayImg); //cvShowImage(szCannyName, pCannyImg); cvSetImageCOI(pImage, 1); cvCopy(pImage, pSub1, NULL); cvCop
15、y(pGrayImg, pSub2, NULL); cvCopy(pCannyImg, pSub3, NULL); cvPutText(pSub1, szWindowName, cvPoint(nWidth/2, nHeight/2), &myfont, cvScalar(255,0,0)); cvPutText(pSub2, szGrayName, cvPoint(nWidth/2, nHeight/2), &myfont, cvScalar(255,0,0)); cvPutText(pSub3, szCannyName, cvPoint(
16、nWidth/2, nHeight/2), &myfont, cvScalar(255,0,0)); doDrawing(pCombineImg); cvShowImage(szCombineName, pCombineImg); cvSetImageCOI(pImage, 0); } } while (true); // do NOT release pImage because it is only retrieved from capture //cvReleaseImage(&pImage); cvRele
17、aseImageHeader(&pSub1); cvReleaseImageHeader(&pSub2); cvReleaseImageHeader(&pSub3); cvReleaseImage(&pGrayImg); cvReleaseImage(&pCannyImg); cvReleaseImage(&pCombineImg); cvReleaseCapture(&pCapture); } cvDestroyAllWindows(); } void myMouseOnClick(int event, int x, int y, in
18、t flag, void* pUser) { char buffer[256]; CvFont myFont = cvFont(2, 2); IplImage* pImage = (IplImage*)pUser; char* ptr = NULL; unsigned char r=0, g=0, b=0; switch (event) { case CV_EVENT_LBUTTONDOWN: ptr = pImage->imageData + y*pImage->widthStep + x * pImage->depth* pImage->nCha
19、nnels/8; r = ptr[0]; g = ptr[1]; b = ptr[2]; sprintf(buffer, "rgb [%d,%d,%d]", r,g,b); cvPutText(pImage, buffer, cvPoint(x, y), &myFont, cvScalar(255,0,0)); break; } } void exercise2() { IplImage* pImage = NULL; //, *pCloneImage = NULL; pImage = cvLoadImage("mytest.j
20、pg"); //pCloneImage = cvCloneImage(pImage); cvNamedWindow("mytest"); cvSetMouseCallback("mytest", myMouseOnClick, pImage); do { cvShowImage("mytest", pImage); if (cvWaitKey(1000)==27) { break; } } while (true); cvReleaseImage(&pImage); cvDestroyWindow("mytest");
21、} #define HistogramWidth 48 #define HistogramHeight 800 IplImage* pImage = NULL, *pCloneImage = NULL, *pHistImage= NULL; CvRect rect = cvRect(0,0,0,0); bool bStart = false; #if 0 void eraseFrame() { CvMat vecSrc, vecDst; cvSetImageROI(pImage, rect); cvSetImageROI(pCloneImage
22、, rect); cvGetRow(pImage, &vecSrc, 0); cvGetRow(pCloneImage, &vecDst, 0); cvCopy(&vecSrc, &vecDst); cvGetRow(pImage, &vecSrc, rect.height-1); cvGetRow(pCloneImage, &vecDst, rect.height-1); cvCopy(&vecSrc, &vecDst); cvGetCol(pImage, &vecSrc, 0); cvGetCol(pCloneImage, &vecDst
23、, 0); cvCopy(&vecSrc, &vecDst); cvGetCol(pImage, &vecSrc, rect.width-1); cvGetCol(pCloneImage, &vecDst, rect.width-1); cvCopy(&vecSrc, &vecDst); cvResetImageROI(pImage); cvResetImageROI(pCloneImage); } #else void eraseFrame() { cvSetImageROI(pImage, rect); cvSetImageROI(p
24、CloneImage, rect); cvCopy(pCloneImage, pImage); cvResetImageROI(pImage); cvResetImageROI(pCloneImage); } #endif #define LINE_WIDTH 1 void drawFrame() { cvRectangle(pImage, cvPoint(rect.x, rect.y), cvPoint(rect.x+rect.width-1, rect.y+rect.height-1), cvScalarAll(255), LINE_WIDTH);
25、 //cvLine(pImage, cvPoint(rect.x, rect.y), cvPoint(rect.x+rect.width, rect.y+rect.height), cvScalarAll(255), LINE_WIDTH); } void drawHistogram() { char* ptr = NULL, *pRow = NULL, *pCol = NULL; char buffer[32]; int hist[3][8]= {0}; int index = 0; int nPixWidth = 0; int r, c, i, nOf
26、fset = 0; int x = 0 , y = 0; CvFont myFont = cvFont(1,1); int nMax = 0, nScale=1; nPixWidth = pCloneImage->nChannels*pCloneImage->depth/8; ptr = pCloneImage->imageData + rect.y*pCloneImage->widthStep + rect.x*nPixWidth; pRow = ptr; for (r = 0; r < rect.height; r ++) { pCol = pR
27、ow; for (c = 0; c < rect.width; c ++) { for (i =0; i < 3; i ++) { index = pCol[i] / 32; hist[i][index] ++; if (hist[i][index] > nMax) { nMax = hist[i][index]; } } pCol += nPixWidth; } pRow += pCloneImage->widthStep; } cvSet(pHistImage, c
28、vScalarAll(255)); y = HistogramHeight; nScale = HistogramHeight / HistogramHeight; if (nScale == 0) { nScale = 1; } for (c = 0; c < 8; c ++) { for (i = 0; i < 3; i ++) { unsigned char color[3]={0}; x = nOffset; color[i] = 255; if (hist[i][c] / nScal
29、e != 0) { cvSetImageROI(pHistImage, cvRect(x+i*HistogramWidth, y - hist[i][c]/nScale, HistogramWidth, hist[i][c]/nScale)); cvSet(pHistImage, cvScalar(color[0], color[1], color[2])); cvResetImageROI(pHistImage); } sprintf(buffer, "%d", hist[i][c]); cvPutText(pHistIma
30、ge, buffer, cvPoint(x+i*HistogramWidth, y-100), &myFont, cvScalarAll(0)); } nOffset += HistogramWidth*3; } cvShowImage("histogram", pHistImage); } void myMouseCallback3(int event, int x, int y, int flag, void* pUser) { int w = 0, h = 0; switch (event) { case CV_EVENT_MOUSEMO
31、VE: if (!bStart) { break; } w = x - rect.x; h = y - rect.y; if (w > LINE_WIDTH && h > LINE_WIDTH) { if (w != rect.width || h != rect.height) { if (rect.width > 0 && rect.height > 0) { eraseFrame(); /////////////////////////////////
32、 } rect.width = w; rect.height = h; //cvSetImageROI(pImage, rect); //cvSetImageROI(pCloneImage, rect); //cvSet(pImage, cvScalarAll(255)); drawFrame(); //cvResetImageROI(pImage); //cvResetImageROI(pCloneImage); } } break; case CV_
33、EVENT_LBUTTONDOWN: if (rect.width > 0 && rect.height > 0) { cvSetImageROI(pImage, rect); cvSetImageROI(pCloneImage, rect); cvCopy(pCloneImage, pImage); cvResetImageROI(pImage); cvResetImageROI(pCloneImage); ///////////////////////////////// } rect.x = x;
34、rect.y = y; rect.width = rect.height = 0; bStart = true; break; case CV_EVENT_LBUTTONUP: if (rect.width > 0 && rect.height > 0) { cvSetImageROI(pImage, rect); cvSet(pImage, cvScalarAll(255)); cvResetImageROI(pImage); drawHistogram(); ///////////////////
35、////////////// } bStart = false; break; } } void exercise3() { pImage = cvLoadImage("mytest.jpg"); pCloneImage = cvCloneImage(pImage); cvNamedWindow("histogram"); cvNamedWindow("mytest"); cvSetMouseCallback("mytest", myMouseCallback3, NULL); pHistImage = cvCreateIma
36、ge(cvSize(8 * HistogramWidth * 3, HistogramHeight+200), 8, 3); do { cvShowImage("mytest", pImage); if (cvWaitKey(100)==27) { break; } } while (true); cvReleaseImage(&pImage); cvReleaseImage(&pCloneImage); cvDestroyWindow("mytest"); } int APIENTRY WinMain(HINSTANCE
37、 hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow) { exercise3(); //myTest(); return 0; } ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// There is a problem that I dont know how to c
38、ontrol the program flow. For example, I setup two cvWaitKey because I place one in my main program and another one in the while loop of "playing video". You see, if you dont place a "cvWaitKey" inside the video playing loop, then there is simply no redrawing of window. Just image there is no ove
39、rlapping threads to either decode video or draw window.
The following is a simple program acting as an video player(exercise4)
#include
40、a comment(lib, "cvd.lib") #pragma comment(lib, "cxcored.lib") #pragma comment(lib, "highguid.lib") int g_nProgress = 0; int g_nPause = 0; int g_nWait = 0; CvCapture* pCapture = NULL; int nValue = -1; char* szWindowName = "myplayer"; void switchCallback4(int nPos) { double fPos = 0.0;
41、 fPos = (double)nPos / (double)10; if (pCapture) { cvSetCaptureProperty(pCapture, CV_CAP_PROP_POS_AVI_RATIO, fPos); } } void myPlayer() { IplImage* pImage = NULL; do { if (g_nPause == 0) { break; } pImage = cvQueryFrame(pCapture); if (pImage) { cvSho
42、wImage(szWindowName, pImage); } nValue = cvWaitKey(50); } while (nValue == -1); } void switchCallback5(int nPos) { if (nPos == 1) { myPlayer(); } } void exercise4() { pCapture = cvCreateFileCapture("mytest.avi"); if (pCapture) { cvNamedWindow(szWindowName);
43、 cvCreateTrackbar("progress", szWindowName, &g_nProgress, 10, switchCallback4); cvCreateTrackbar("pause", szWindowName, &g_nPause, 1, switchCallback5); do { if (cvWaitKey(0) == 27) { break; } } while(true); cvReleaseCapture(&pCapture); cvDestroyWindow(szW
44、indowName);
}
}
int APIENTRY WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)
{
exercise4();
return 0;
}
chapter 5 exercises:
#include
45、ude
46、, *pSimpleImg = NULL, *pNoScaleImg = NULL, *pMedianImg = NULL, *pGaussianImg = NULL, *pBilateralImg = NULL; int i = 0; for (i = 0; i < sizeof(szWindowName)/sizeof(char*); i ++) { cvNamedWindow(szWindowName[i]); } pImage = cvLoadImage("mytest.jpg"); if (pImage) { pSimpleImg =
47、 cvCreateImage(cvSize(pImage->width, pImage->height), pImage->depth, pImage->nChannels); pNoScaleImg = cvCreateImage(cvSize(pImage->width, pImage->height), IPL_DEPTH_16S, pImage->nChannels); pMedianImg = cvCreateImage(cvSize(pImage->width, pImage->height), pImage->depth, pImage->nChannels);
48、 pGaussianImg = cvCreateImage(cvSize(pImage->width, pImage->height), pImage->depth, pImage->nChannels); pBilateralImg = cvCreateImage(cvSize(pImage->width, pImage->height), pImage->depth, pImage->nChannels); cvSmooth(pImage, pSimpleImg, CV_BLUR, 5,5, 5,5); cvSmooth(pImage, pNoScaleImg,
49、CV_BLUR_NO_SCALE,11,11, 32,0.5); cvSmooth(pImage, pMedianImg, CV_MEDIAN,5,5, 5,5); cvSmooth(pImage, pGaussianImg, CV_GAUSSIAN,5,5, 5,5); cvSmooth(pImage, pBilateralImg, CV_BILATERAL, 3,3,0.01, 0.003); cvShowImage(szWindowName[0], pImage); cvShowImage(szWindowName[1], pSimpleImg);
50、 cvShowImage(szWindowName[2], pNoScaleImg); cvShowImage(szWindowName[3], pMedianImg); cvShowImage(szWindowName[4], pGaussianImg); cvShowImage(szWindowName[5], pBilateralImg); cvWaitKey(0); cvReleaseImage(&pImage); cvReleaseImage(&pSimpleImg); cvReleaseImage(&pNoScaleImg);
51、 cvReleaseImage(&pMedianImg); cvReleaseImage(&pGaussianImg); cvReleaseImage(&pBilateralImg); } cvDestroyAllWindows(); } void exercise2() { char* szWindowName[] = {"original", "3x3", "5x5", "5x5 second", "9x9", "11x11"}; IplImage* pImage = NULL, *pImage3 = NULL, *pImage5 = NULL,
52、*pImage5_2 = NULL, *pImage7 = NULL, *pImage9 = NULL, *pImage11 = NULL; int i = 0; for (i = 0; i < sizeof(szWindowName)/sizeof(char*); i ++) { cvNamedWindow(szWindowName[i]); } pImage = cvLoadImage("mytest.jpg"); if (pImage) { pImage3 = cvCreateImage(cvSize(pImage->width, pIm
53、age->height), pImage->depth, pImage->nChannels); pImage5 = cvCreateImage(cvSize(pImage->width, pImage->height), pImage->depth, pImage->nChannels); pImage5_2 = cvCreateImage(cvSize(pImage->width, pImage->height), pImage->depth, pImage->nChannels); pImage7 = cvCreateImage(cvSize(pImage->width
54、, pImage->height), pImage->depth, pImage->nChannels); pImage9 = cvCreateImage(cvSize(pImage->width, pImage->height), pImage->depth, pImage->nChannels); pImage11 = cvCreateImage(cvSize(pImage->width, pImage->height), pImage->depth, pImage->nChannels); cvSmooth(pImage, pImage3, CV_GAUSSIAN,
55、 3,3); cvSmooth(pImage, pImage5, CV_GAUSSIAN, 5,5); cvSmooth(pImage5, pImage5_2, CV_GAUSSIAN, 5,5); cvSmooth(pImage, pImage7, CV_GAUSSIAN,7,7); cvSmooth(pImage, pImage9, CV_GAUSSIAN,9,9); cvSmooth(pImage, pImage11, CV_GAUSSIAN,11,11); cvShowImage(szWindowName[0], pImage); cv
56、ShowImage(szWindowName[1], pImage3); cvShowImage(szWindowName[2], pImage5); cvShowImage(szWindowName[3], pImage5_2); cvShowImage(szWindowName[4], pImage7); cvShowImage(szWindowName[5], pImage9); cvShowImage(szWindowName[6], pImage11); cvWaitKey(0); cvReleaseImage(&pImage);
57、cvReleaseImage(&pImage3); cvReleaseImage(&pImage5); cvReleaseImage(&pImage5_2); cvReleaseImage(&pImage7); cvReleaseImage(&pImage9); cvReleaseImage(&pImage11); } cvDestroyAllWindows(); } void exercise3() { IplImage* pImage = NULL, *pImage5 = NULL, *pImage9 = NULL, *pImage5
58、_second = NULL; char* ptr = NULL; int i = 0; char* szWindowName[] = {"original", "5x5", "9x9", "5x5 second"}; pImage = cvCreateImage(cvSize(100, 100), 8, 1); pImage5 = cvCreateImage(cvSize(100, 100), 8, 1); pImage5_second = cvCreateImage(cvSize(100, 100), 8, 1); pImage9 = cvCreateIma
59、ge(cvSize(100, 100), 8, 1); cvSetZero(pImage); cvSetZero(pImage5); cvSetZero(pImage9); ptr = pImage->imageData + pImage->widthStep * 49 + 50 * pImage->depth * pImage->nChannels/8; *ptr = 255; for (i = 0; i < sizeof(szWindowName)/sizeof(char*); i ++) { cvNamedWindow(szWindowNam
60、e[i]); } cvSmooth(pImage, pImage5, CV_GAUSSIAN, 5,5); cvSmooth(pImage5, pImage5_second, CV_GAUSSIAN, 5,5); cvSmooth(pImage, pImage9, CV_GAUSSIAN, 9,9); //cvSmooth(pImage, pImage5); //cvSmooth(pImage, pImage9); //cvSmooth(pImage5, pImage5_second); cvMoveWindow(szWindowName[1], 1
61、00, 200); cvShowImage(szWindowName[0], pImage); cvShowImage(szWindowName[1], pImage5); cvShowImage(szWindowName[2], pImage9); cvShowImage(szWindowName[3], pImage5_second); cvWaitKey(0); cvReleaseImage(&pImage); cvReleaseImage(&pImage5); cvReleaseImage(&pImage9); cvReleaseImage(
62、&pImage5_second); cvDestroyAllWindows(); } void exercise4() { IplImage* pImage[8]= {NULL}; int i = 0; double fSize[3] = {1,4,6}; char* szWindowName[] = {"original", "9-9-x", "0-0-x", "0-0-1-9", "0-0-9-1", "0-0-==>1-9==>9-1", "0-0-9-9","9-9-0-0"}; for (i = 0; i < sizeof(sz
63、WindowName)/sizeof(char*); i ++) { if (i == 0) { pImage[0] = cvLoadImage("mytest.jpg"); } else { pImage[i] = cvCreateImage(cvSize(pImage[0]->width, pImage[0]->height), pImage[0]->depth, pImage[0]->nChannels); } cvNamedWindow(szWindowName[i]); } for (i = 0; i <
64、3; i ++) { cvSmooth(pImage[0], pImage[1], CV_GAUSSIAN, 9,9,fSize[i]); cvSmooth(pImage[0], pImage[2], CV_GAUSSIAN, 0,0,fSize[i]); cvShowImage(szWindowName[0], pImage[0]); cvShowImage(szWindowName[1], pImage[1]); cvShowImage(szWindowName[2], pImage[2]); cvWaitKey(0); } // c.
65、 cvSmooth(pImage[0], pImage[3], CV_GAUSSIAN, 0,0,1,9); cvShowImage(szWindowName[3], pImage[3]); // d. cvSmooth(pImage[0], pImage[4], CV_GAUSSIAN, 0,0,9,1); cvShowImage(szWindowName[4], pImage[4]); // e cvSmooth(pImage[3], pImage[5], CV_GAUSSIAN, 0,0,9,1); cvShowImage(szWindowName[
66、5], pImage[5]); // f. cvSmooth(pImage[3], pImage[6], CV_GAUSSIAN, 0,0,9,9); cvShowImage(szWindowName[6], pImage[6]); cvSmooth(pImage[3], pImage[7], CV_GAUSSIAN, 9,9,0,0); cvShowImage(szWindowName[7], pImage[7]); cvShowImage(szWindowName[0], pImage[0]); ////////////////////////////////////////////////// cvWaitKey(0); for (i = 0; i < sizeof(szWindowName)/sizeof(char*); i ++) { cvReleaseImage(&pImage[i]); } cvDestroyAllWindows(); } int APIENTRY Wi
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