C++代码提取骨架的实现:(代码来自opencv的扩展模块ximgproc.hpp)
cpp
void thinningIteration(Mat &img, int iter, int thinningType)
{
Mat marker = Mat::zeros(img.size(), CV_8UC1);
if (thinningType == 0)
{
for (int i = 1; i < img.rows - 1; i++)
{
for (int j = 1; j < img.cols - 1; j++)
{
if (img.at<uchar>(i, j) == 0)
{
continue;
}
uchar p2 = img.at<uchar>(i - 1, j);
uchar p3 = img.at<uchar>(i - 1, j + 1);
uchar p4 = img.at<uchar>(i, j + 1);
uchar p5 = img.at<uchar>(i + 1, j + 1);
uchar p6 = img.at<uchar>(i + 1, j);
uchar p7 = img.at<uchar>(i + 1, j - 1);
uchar p8 = img.at<uchar>(i, j - 1);
uchar p9 = img.at<uchar>(i - 1, j - 1);
int A = (p2 == 0 && p3 == 1) + (p3 == 0 && p4 == 1) +
(p4 == 0 && p5 == 1) + (p5 == 0 && p6 == 1) +
(p6 == 0 && p7 == 1) + (p7 == 0 && p8 == 1) +
(p8 == 0 && p9 == 1) + (p9 == 0 && p2 == 1);
int B = p2 + p3 + p4 + p5 + p6 + p7 + p8 + p9;
int m1 = iter == 0 ? (p2 * p4 * p6) : (p2 * p4 * p8);
int m2 = iter == 0 ? (p4 * p6 * p8) : (p2 * p6 * p8);
if (A == 1 && (B >= 2 && B <= 6) && m1 == 0 && m2 == 0)
marker.at<uchar>(i, j) = 1;
}
}
}
if (thinningType == 1) //THINNING_GUOHALL
{
for (int i = 1; i < img.rows - 1; i++)
{
for (int j = 1; j < img.cols - 1; j++)
{
if (img.at<uchar>(i, j) == 0)
{
continue;
}
uchar p2 = img.at<uchar>(i - 1, j);
uchar p3 = img.at<uchar>(i - 1, j + 1);
uchar p4 = img.at<uchar>(i, j + 1);
uchar p5 = img.at<uchar>(i + 1, j + 1);
uchar p6 = img.at<uchar>(i + 1, j);
uchar p7 = img.at<uchar>(i + 1, j - 1);
uchar p8 = img.at<uchar>(i, j - 1);
uchar p9 = img.at<uchar>(i - 1, j - 1);
int C = ((!p2) & (p3 | p4)) + ((!p4) & (p5 | p6)) +
((!p6) & (p7 | p8)) + ((!p8) & (p9 | p2));
int N1 = (p9 | p2) + (p3 | p4) + (p5 | p6) + (p7 | p8);
int N2 = (p2 | p3) + (p4 | p5) + (p6 | p7) + (p8 | p9);
int N = N1 < N2 ? N1 : N2;
int m = iter == 0 ? ((p6 | p7 | (!p9)) & p8) : ((p2 | p3 | (!p5)) & p4);
if ((C == 1) && ((N >= 2) && ((N <= 3)) & (m == 0)))
marker.at<uchar>(i, j) = 1;
}
}
}
img &= ~marker;
}
Mat thinning(Mat input, int thinningType)
{
Mat output = input.clone();
// Enforce the range of the input image to be in between 0 - 255
output /= 255;
Mat prev = Mat::zeros(output.size(), CV_8UC1);
Mat diff;
do {
thinningIteration(output, 0, thinningType);
thinningIteration(output, 1, thinningType);
absdiff(output, prev, diff);
output.copyTo(prev);
} while (countNonZero(diff) > 0);
output *= 255;
return output;
}