Problems with ofxCv and distance transform

@aceslowman wrote:

I am having some issues using an image for a distance transform. Following the tutorial here:

http://docs.opencv.org/trunk/d2/dbd/tutorial_distance_transform.html

The only error that I am getting is that cv::cvtColor() is returning errors indicating that the input matrix doesn't match the conversion type. Otherwise, I'm only getting a black image out of the distance transform, with some occasionally flickering (which really leads me to believe the input to the distance transform is somehow incorrect).

Mat bw, dist;
Mat src = toCv(kinect.getDepthPixels());
cv::cvtColor(src, bw, CV_RGBA2GRAY);
threshold(src, bw, 40, 255, CV_THRESH_BINARY | CV_THRESH_OTSU);
distanceTransform(src, dist, CV_DIST_L2, 3);
normalize(dist, dist, 0, 1., NORM_MINMAX);
drawMat(dist,0,0,400,300);
drawMat(src,400,0,400,300);

So, from what I understand, first I have to get my image into a format suitable for cv, so toCv() seemed to be the first step. Then I need to work on converting that matrix into a binary image. Now the rest is following the tutorial, but when I draw the dist mat, I get nothing, aside from some occasional flickering.

Does anyone know what I might be missing in this? The rest of my ofApp.cpp is below:

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