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Clarified spec

This commit is contained in:
Davis King 2018-05-23 23:02:57 -04:00
parent 844b355232
commit 8785ac1d9a
1 changed files with 8 additions and 9 deletions
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17
dlib/image_transforms/interpolation_abstract.h
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@ -1466,15 +1466,14 @@ namespace dlib
- pts.size() == 4
ensures
- The 4 points in pts define a convex quadrilateral and this function extracts
that part of the image and stores it into #out. Therefore, each corner of
the quadrilateral is associated to a corner of #out and bilinear
that part of the input image img and stores it into #out. Therefore, each
corner of the quadrilateral is associated to a corner of #out and bilinear
interpolation and a projective mapping is used to transform the pixels in the
quadrilateral in img into #out. To determine which corners of the
quadrilateral map to which corners of #out we fit the tightest possible
rectangle to the quadrilateral and map its vertices to their nearest
rectangle corners. These corners are then trivially mapped to #out (i.e.
upper left corner to upper left corner, upper right corner to upper right
corner, etc.).
quadrilateral into #out. To determine which corners of the quadrilateral map
to which corners of #out we fit the tightest possible rectangle to the
quadrilateral and map its vertices to their nearest rectangle corners. These
corners are then trivially mapped to #out (i.e. upper left corner to upper
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.
!*/
@ -1496,7 +1495,7 @@ namespace dlib
ensures
- This routine simply finds the 4 intersecting points of the given lines and
uses them in a call to the version of extract_image_4points() defined above.
i.e. extract_image_chips(img, out, intersections_between_lines)
i.e. extract_image_4points(img, out, intersections_between_lines)
- Since 4 lines might intersect at more than 4 locations, we select the
intersections that give a quadrilateral with opposing sides that are as
parallel as possible.