cvStartFindContours 出现奇怪的问题？

发布于 2024-12-12 19:16:15 字数 1661 浏览 2 评论 0原文

每当我将图像传递给 cvStartFindContours 时，我的图像就会变成全黑，而不是找到轮廓。我完全不知道为什么。我知道这不是由代码的另一部分引起的，即使我注释掉所有内容，但保留对 cvStartFindContours 的函数调用，我的图像仍然变黑。然而，当我注释掉对 cvStartFindContours 的调用时，我的图像仍然正常。为什么会发生这种情况？我传入的图像 (skinMask) 是一个包含数据的 8 位、1 通道图像 (IPL_DEPTH_8U)。（它不是黑色的，上面有白色的碎片）。

为什么我的图像变黑了？谢谢

void connectedComponents ()
{
     cvMorphologyEx (skinMask, skinMask, 0, 0, CV_MOP_OPEN, 1);
     cvMorphologyEx (skinMask, skinMask, 0, 0, CV_MOP_CLOSE, 1);

     CvMemStorage *connectedCompStorage = cvCreateMemStorage (0);
     CvSeq *temp = NULL; //used to loop through contour perimeter checking
     CvSeq *connectedComp = NULL; //stores all derived connected component contours

     CvContourScanner connectedCompScanner = cvStartFindContours (skinMask, connectedCompStorage); //FUNCTION CALL CAUSING PROBLEMS

     while ((temp = cvFindNextContour (connectedCompScanner)) != NULL)
     {
         double perimeter = cvContourPerimeter (temp);

         if (perimeter < CC_PERIMETER_THRESH)
         {
             cvSubstituteContour (connectedCompScanner, NULL);
         }

         else
         {
             temp = cvApproxPoly (temp, sizeof (CvContour), connectedCompStorage, CV_POLY_APPROX_DP, 2, 0);
             cvSubstituteContour (connectedCompScanner, temp);
         }
     }

     connectedComp = cvEndFindContours (&connectedCompScanner);

     cvZero (skinMask);

     for (temp = connectedComp; temp != NULL; temp = temp -> h_next);
     {
         cvDrawContours (skinMask, temp, cvScalar (255, 255, 255), cvScalar (0, 0, 0), -1,   CV_FILLED, 8);
     }

     cvReleaseMemStorage (&connectedCompStorage);
}

原文

Whenever I pass in an image to cvStartFindContours, instead of finding the contours, my image turns completely black. I have absolutely no idea why. I know this isn't caused by another part of the code even if I comment everything out, but leave in the function call to cvStartFindContours, my image still turns black. However the second I comment out the call to cvStartFindContours, my image remains normal. Why is this happening? The image I pass in (skinMask) is a 8 bit, 1 channel image (IPL_DEPTH_8U) with CONTAINS data. (it isn't black it has pieces of white on it).

Why is my image turning black? Thanks

void connectedComponents ()
{
     cvMorphologyEx (skinMask, skinMask, 0, 0, CV_MOP_OPEN, 1);
     cvMorphologyEx (skinMask, skinMask, 0, 0, CV_MOP_CLOSE, 1);

     CvMemStorage *connectedCompStorage = cvCreateMemStorage (0);
     CvSeq *temp = NULL; //used to loop through contour perimeter checking
     CvSeq *connectedComp = NULL; //stores all derived connected component contours

     CvContourScanner connectedCompScanner = cvStartFindContours (skinMask, connectedCompStorage); //FUNCTION CALL CAUSING PROBLEMS

     while ((temp = cvFindNextContour (connectedCompScanner)) != NULL)
     {
         double perimeter = cvContourPerimeter (temp);

         if (perimeter < CC_PERIMETER_THRESH)
         {
             cvSubstituteContour (connectedCompScanner, NULL);
         }

         else
         {
             temp = cvApproxPoly (temp, sizeof (CvContour), connectedCompStorage, CV_POLY_APPROX_DP, 2, 0);
             cvSubstituteContour (connectedCompScanner, temp);
         }
     }

     connectedComp = cvEndFindContours (&connectedCompScanner);

     cvZero (skinMask);

     for (temp = connectedComp; temp != NULL; temp = temp -> h_next);
     {
         cvDrawContours (skinMask, temp, cvScalar (255, 255, 255), cvScalar (0, 0, 0), -1,   CV_FILLED, 8);
     }

     cvReleaseMemStorage (&connectedCompStorage);
}

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幸福％小乖 2024-12-19 19:16:16

我也被这个咬过。来自 findContours 的 OpenCV 文档：

image – 源，8 位单通道图像。非零像素是
被视为 1。零像素仍为 0，因此图像被视为
二进制 .您可以使用 compare() 、 inRange() 、 threshold() 、
adaptiveThreshold() 、 Canny() 等用于创建二进制图像
灰度或彩色。该函数修改图像，同时
提取轮廓。

因此，如果您不希望修改 skinMask 图像，则需要传入它的副本...