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added test for http://code.opencv.org/issues/2957

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This commit is contained in:
Vadim Pisarevsky 2015-05-14 16:25:18 +03:00
parent b37aaa8303
commit 05d888316a
1 changed files with 61 additions and 0 deletions
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61
modules/imgproc/test/test_contours.cpp
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@ -40,6 +40,7 @@
//M*/
#include "test_precomp.hpp"
#include "opencv2/highgui.hpp"
using namespace cv;
using namespace std;
@ -429,4 +430,64 @@ TEST(Core_Drawing, polylines)
int cnt = countNonZero(img);
ASSERT_EQ(cnt, 21);
}
//rotate/flip a quadrant appropriately
static void rot(int n, int *x, int *y, int rx, int ry)
{
if (ry == 0) {
if (rx == 1) {
*x = n-1 - *x;
*y = n-1 - *y;
}
//Swap x and y
int t = *x;
*x = *y;
*y = t;
}
}
static void d2xy(int n, int d, int *x, int *y)
{
int rx, ry, s, t=d;
*x = *y = 0;
for (s=1; s<n; s*=2)
{
rx = 1 & (t/2);
ry = 1 & (t ^ rx);
rot(s, x, y, rx, ry);
*x += s * rx;
*y += s * ry;
t /= 4;
}
}
TEST(Imgproc_FindContours, hilbert)
{
int n = 64, n2 = n*n, scale = 10, w = (n + 2)*scale;
Point ofs(scale, scale);
Mat img(w, w, CV_8U);
img.setTo(Scalar::all(0));
Point p(0,0);
for( int i = 0; i < n2; i++ )
{
Point q(0,0);
d2xy(n2, i, &q.x, &q.y);
line(img, p*scale + ofs, q*scale + ofs, Scalar::all(255));
p = q;
}
dilate(img, img, Mat());
vector<vector<Point> > contours;
findContours(img, contours, noArray(), RETR_LIST, CHAIN_APPROX_SIMPLE);
printf("ncontours = %d, contour[0].npoints=%d\n", (int)contours.size(), (int)contours[0].size());
img.setTo(Scalar::all(0));
drawContours(img, contours, 0, Scalar::all(255), 1);
//imshow("hilbert", img);
//waitKey();
ASSERT_EQ(1, (int)contours.size());
ASSERT_EQ(9832, (int)contours[0].size());
}
/* End of file. */