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return the projective transform in extract_image_4points (#2395)

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Adrià Arrufat 2021-07-27 09:46:36 +09:00 committed by GitHub
parent b850f0e524
commit 951fdd0092
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2 changed files with 11 additions and 6 deletions
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9
dlib/image_transforms/interpolation.h
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@ -2118,7 +2118,7 @@ namespace dlib
template <
typename image_type
>
void extract_image_4points (
point_transform_projective extract_image_4points (
const image_type& img_,
image_type& out_,
const std::array<dpoint,4>& pts
@ -2127,7 +2127,7 @@ namespace dlib
const_image_view<image_type> img(img_);
image_view<image_type> out(out_);
if (out.size() == 0)
return;
return point_transform_projective();
drectangle bounding_box;
for (auto& p : pts)
@ -2160,18 +2160,19 @@ namespace dlib
auto tform = find_projective_transform(from_points, to_points);
transform_image(img_, out_, interpolate_bilinear(), tform);
return inv(tform);
}
template <
typename image_type
>
void extract_image_4points (
point_transform_projective extract_image_4points (
const image_type& img,
image_type& out,
const std::array<line,4>& lines
)
{
extract_image_4points(img, out, find_convex_quadrilateral(lines));
return extract_image_4points(img, out, find_convex_quadrilateral(lines));
}
// ----------------------------------------------------------------------------------------

8
dlib/image_transforms/interpolation_abstract.h
View File

@ -1542,7 +1542,7 @@ namespace dlib
template <
typename image_type
>
void extract_image_4points (
point_transform_projective extract_image_4points (
const image_type& img,
image_type& out,
const std::array<dpoint,4>& pts
@ -1564,12 +1564,14 @@ namespace dlib
left corner, upper right corner to upper right corner, etc.).
- #out.nr() == out.nr() && #out.nc() == out.nc().
I.e. out should already be sized to whatever size you want it to be.
- Returns a transformation object that maps points in img into their
corresponding location in #out.
!*/
template <
typename image_type
>
void extract_image_4points (
point_transform_projective extract_image_4points (
const image_type& img,
image_type& out,
const std::array<line,4>& lines
@ -1584,6 +1586,8 @@ namespace dlib
convex quadrilateral and uses them in a call to the version of
extract_image_4points() defined above. i.e. extract_image_4points(img, out,
intersections_between_lines)
- Returns a transformation object that maps points in img into their
corresponding location in #out.
throws
- no_convex_quadrilateral: this is thrown if you can't make a convex
quadrilateral out of the given lines.