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add alternative thinning method (skeletonize) #263

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Sep 13, 2019
Merged

add alternative thinning method (skeletonize) #263

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24 changes: 24 additions & 0 deletions libs/ofxCv/include/ofxCv/Helpers.h
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Original file line number Diff line number Diff line change
Expand Up @@ -193,6 +193,30 @@ namespace ofxCv {
for(int i=0;i<n;i++){int j=q[i];if(!p[j+ic2]&&!p[j+ic1]&&!p[j+ib1]&&p[j+ia2]&&p[j+ib3]){p[j]=0;}}
for(int i=0;i<n;i++){int j=q[i];if(!p[j+ib1]&&!p[j+ia1]&&!p[j+ia2]&&p[j+ic2]&&p[j+ib3]){p[j]=0;}}
}

//same as above, different implementation taken from
//http://felix.abecassis.me/2011/09/opencv-morphological-skeleton/
template <class T>
void thin2(T& img) {

cv::Mat mat = toCv(img);
cv::Mat skel(mat.size(), CV_8UC1, cv::Scalar(0));
cv::Mat temp;
cv::Mat eroded;

cv::Mat element = cv::getStructuringElement(cv::MORPH_CROSS, cv::Size(3, 3));
bool done;
do{
cv::erode(mat, eroded, element);
cv::dilate(eroded, temp, element);
cv::subtract(mat, temp, temp);
cv::bitwise_or(skel, temp, skel);
eroded.copyTo(mat);
done = (cv::countNonZero(mat) == 0);
} while (!done);
skel.copyTo(mat);
return;
}

// given a vector of lines, this function will find the average angle
float weightedAverageAngle(const std::vector<cv::Vec4i>& lines);
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