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dlib
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Added hough transform unit tests

This commit is contained in:
Davis King 2014-12-08 20:07:11 -05:00
parent 81ddd13b10
commit c0eaf1fdd9
1 changed files with 62 additions and 3 deletions
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65
dlib/test/image.cpp
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@ -1611,12 +1611,12 @@ namespace
if (get_rect(out).contains(rect))
{
T val = sum(pointwise_multiply(filt, subm(mat(img),rect)));
DLIB_CASSERT(val == out[r][c],"err: " << val-out[r][c]);
DLIB_CASSERT(area.contains(point(c,r)),"");
DLIB_TEST_MSG(val == out[r][c],"err: " << val-out[r][c]);
DLIB_TEST(area.contains(point(c,r)));
}
else
{
DLIB_CASSERT(!area.contains(point(c,r)),"");
DLIB_TEST(!area.contains(point(c,r)));
}
}
}
@ -1671,6 +1671,64 @@ namespace
}
}
// ----------------------------------------------------------------------------------------
void run_hough_test()
{
array2d<unsigned char> img(300,300);
for (int k = -2; k <= 2; ++k)
{
print_spinner();
running_stats<double> rs;
array2d<int> himg;
hough_transform ht(200+k);
double angle1 = 0;
double angle2 = 0;
const int len = 90;
// Draw a bunch of random lines, hough transform them, then make sure the hough
// transform detects them accurately.
for (int i = 0; i < 500; ++i)
{
point cent = center(get_rect(img));
point arc = cent + point(len,0);
arc = rotate_point(cent, arc, angle1);
point l = arc + point(500,0);
point r = arc - point(500,0);
l = rotate_point(arc, l, angle2);
r = rotate_point(arc, r, angle2);
angle1 += pi/13;
angle2 += pi/40;
assign_all_pixels(img, 0);
draw_line(img, l, r, 255);
rectangle box = translate_rect(get_rect(ht),point(50,50));
ht(img, box, himg);
point p = max_point(mat(himg));
DLIB_TEST(himg[p.y()][p.x()] > 255*3);
l -= point(50,50);
r -= point(50,50);
std::pair<point,point> line = ht.get_line(p);
// make sure the best scoring hough point matches the line we drew.
double dist1 = distance_to_line(make_pair(l,r), line.first);
double dist2 = distance_to_line(make_pair(l,r), line.second);
//cout << "DIST1: " << dist1 << endl;
//cout << "DIST2: " << dist2 << endl;
rs.add(dist1);
rs.add(dist2);
DLIB_TEST(dist1 < 2.5);
DLIB_TEST(dist2 < 2.5);
}
//cout << "rs.mean(): " << rs.mean() << endl;
DLIB_TEST(rs.mean() < 0.7);
}
}
// ----------------------------------------------------------------------------------------
class image_tester : public tester
@ -1686,6 +1744,7 @@ namespace
)
{
image_test();
run_hough_test();
test_integral_image<long, unsigned char>();
test_integral_image<double, int>();
test_integral_image<long, unsigned char>();