返回類型爲數組IPlImage

Question

今天我花了整整一天的時間尋找一種方法來保存openCV中IplImage類型的圖像數組，並且失敗。

這就是我要做的：

IplImage* GetThresholdedImage(IplImage* img) { 

IplImage* imageTest[2]; 

IplImage* imgHSV = cvCreateImage(cvGetSize(img), 8, 3); // hold the resulted HSV image 

cvCvtColor(img, imgHSV, CV_BGR2HSV); // convert the coming image from the camera from RGB format to HSV (Hue, Saturation, Value) 

imageTest[0] = cvCreateImage(cvGetSize(img), 8, 1); //hold the thresholded image of the yellow color 

imageTest[1] = cvCreateImage(cvGetSize(img), 8, 1); //hold the thresholded image of the red color 

cvSmooth(imgHSV, imgHSV, CV_GAUSSIAN, 11, 11); //smooth the image to remove the noise from the image 

cvInRangeS(imgHSV, cvScalar(24, 100, 150), cvScalar(34, 255, 255), 
     imageTest[0]); //this function filter out the colors in this range (This is a yellow color) 

cvInRangeS(imgHSV, cvScalar(172, 100, 150), cvScalar(179, 255, 255), 
     imageTest[1]); //this function filter out the colors in this range (This is a red color) 


cvReleaseImage(&imgHSV); 

return *imageTest; 

}

現在，當我嘗試返回主陣列，以處理它 - >

IplImage *thresholdedImage;// = cvCreateImage(cvGetSize(frame), 8, 1); // to store the thresholded image 

IplImage *yellow = cvCreateImage(cvGetSize(frame), 8, 1); 
IplImage *red = cvCreateImage(cvGetSize(frame), 8, 1); 


//=========================================== 

// start creating three windows to show the video after being thresholded, after it passes the contour function and the final video 

cvNamedWindow("display", CV_WINDOW_AUTOSIZE); 
cvNamedWindow("Threshold", CV_WINDOW_AUTOSIZE); 
cvNamedWindow("contoured", CV_WINDOW_AUTOSIZE); 

while (key != 'q') { // grab the video unless the user press q button 

    frame = cvQueryFrame(capture); 

    if (!frame) { 
     break; 
    } 

    //start the actual video processing on real-time frames 

    //first output of the threshold method 
    thresholdedImage = GetThresholdedImage(frame); 

    yellow = *thresholdedImage; 

    red = *thresholdedImage++; 

    //insert the resulted frame from the above function into the find contour function 
    cvFindContours(yellow, storage, &contours, sizeof(CvContour), 
      CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE, cvPoint(0, 0)); 

    cvFindContours(red, storage, &contours, sizeof(CvContour), 
      CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE, cvPoint(0, 0)); 

但它給我錯誤！

任何幫助表示讚賞，謝謝

Answer 1

指針到IplImage數組是IplImage**。另請注意，您必須從外部提供緩衝區，因爲您無法返回指向本地（非靜態）數據的指針。

void GetImages(IplImage** images, unsigned int num) { 
    // assign pointers here 
    images[0] = ... 
    images[1] = ... 
} 

IplImage *images[2]; 
GetImage(images, 2); 

作爲替代方案，你還可使用new或malloc創建函數中的數組和指針返回到它。請稍後確保您delete/free。

IplImage **CreateImages(unsigned int num) { 
    IplImage **images = new IplImage*[num]; 
    // assign again 
    images[0] = ... 
    return images; 
} 

此外，請確保您在完成這些圖像後即可釋放圖像。所以你不應該使用上面使用的方法（增加指針）。相反，只需使用數組語法來訪問第n個元素。

由於僅返回一個指向第一個圖像而不是實際數組的指針，因此代碼失敗。