OPENCV trackbar中的问题。

Question

我在使用opencv中的trackbar时遇到了麻烦。我希望它用于改变SURF中的参考图像以进行物体识别，但问题是在我的程序中仅检测到一个参考图像。

我知道这是非常基本的，但我是新手opencv。我希望有人给我解决方案。

谢谢。

#include <iostream> 
#include <opencv/cxcore.h> 
#include <opencv2\imgproc\imgproc_c.h> 
#include <stdio.h> 
#include <math.h> 
#include <opencv\highgui.h> 
#include <opencv\cv.h> 
#include <opencv2/features2d/features2d.hpp> 
#include <opencv2/calib3d/calib3d.hpp> 
#include <opencv2/core/core.hpp> 
#include <opencv2/nonfree/features2d.hpp> 
#include <opencv2/legacy/legacy.hpp> 
#include <opencv2\nonfree\nonfree.hpp> 

using namespace std; 
#include "MareMatchingClass.h" 

int colorInt; 
int g_switch_value=0; 

// Trackbar/switch callback 
void switch_callback(int position){ 

if(g_switch_value == 0){ 
    colorInt = 0; 
}else{ 
    colorInt = 1; 
} 
} 

int main() 
{ 


cv::initModule_nonfree(); 

IplImage* PatchImg; 

cvNamedWindow("mainWin",CV_WINDOW_AUTOSIZE); 
cvCreateTrackbar("Switch","mainWin", &g_switch_value, 1, switch_callback); 

if(colorInt == 0) 
{ 
     PatchImg = cvLoadImage("D:/id2.jpg", CV_LOAD_IMAGE_GRAYSCALE); 
} 
else 
{ 

     PatchImg = cvLoadImage("D:/id.jpg", CV_LOAD_IMAGE_GRAYSCALE); 

} 

//Create Matching class 
CMareMatchingClass MMathing;  
//Input PatchImg 
MMathing.ExtractPatchSurf(PatchImg); 

double cornerPt[9]={ 
    MMathing.PatchWidth/2, 0,      MMathing.PatchWidth, 
    0,      MMathing.PatchHeight, MMathing.PatchHeight, 
    1,      1,      1}; 
CvMat* McornerPt2 = cvCreateMat(3, 3, CV_64FC1); 
memcpy(McornerPt2->data.db, cornerPt, sizeof(double)*9); 



int c; 
IplImage* img; 
IplImage* BackGroundImg = NULL; 
CvCapture* capture = cvCaptureFromCAM(0); 
cvSetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH, 320); 
cvSetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT, 240); 


while(1) 
{ 
    cvGrabFrame(capture); 
    img = cvRetrieveFrame(capture); 

    if(BackGroundImg == NULL) 
    { 
     BackGroundImg = cvCreateImage(cvSize(img->width, img->height), 8, 1); 
    } 
    cvCvtColor(img, BackGroundImg, CV_RGB2GRAY); 

    Rect4Pt rect4pt; 

    if(MMathing.GetObjectRectAndBestH(BackGroundImg, &rect4pt) != 0) 
    { 
     cvLine(img, cvPoint(rect4pt.LeftTop.x, rect4pt.LeftTop.y), 
cvPoint(rect4pt.RightTop.x, rect4pt.RightTop.y), cvScalar(255,0,0), 2); 
     cvLine(img, cvPoint(rect4pt.RightTop.x, rect4pt.RightTop.y), 
cvPoint(rect4pt.RightBottom.x, rect4pt.RightBottom.y), cvScalar(255,0,0), 2); 
     cvLine(img, cvPoint(rect4pt.RightBottom.x, rect4pt.RightBottom.y), 
cvPoint(rect4pt.LeftBottom.x, rect4pt.LeftBottom.y), cvScalar(255,0,0), 2); 
     cvLine(img, cvPoint(rect4pt.LeftBottom.x, rect4pt.LeftBottom.y), 
cvPoint(rect4pt.LeftTop.x, rect4pt.LeftTop.y), cvScalar(255,0,0), 2); 

     Rect4Pt rect4ptZ; 
     MMathing.GetHMulRect(McornerPt2,&rect4ptZ); 

    }  


    cvShowImage("mainWin",img); 

    c = cvWaitKey(10); 
    if(c == 27) 
     break; 
} 

cvReleaseCapture(&capture); 
cvDestroyAllWindows(); 
cvReleaseImage(&PatchImg); 
cvReleaseImage(&BackGroundImg); 
cvReleaseMat(&McornerPt2); 



} 

Answer 1

我认为你必须移动代码

if(colorInt!=lastColorInt) 
{ 
    if(colorInt == 0) 
    { 
      PatchImg = cvLoadImage("D:/id2.jpg", CV_LOAD_IMAGE_GRAYSCALE); 
    } 
    else 
    { 
      PatchImg = cvLoadImage("D:/id.jpg", CV_LOAD_IMAGE_GRAYSCALE); 
    } 
lastColorInt=colorInt; 
} 

while循环中，并改变它为寻求改变colorInt变量的状态（我改变它，例如）。不要忘记释放分配的图像。