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added KeyPoint::hash() (ticket #1100)

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This commit is contained in:
Vadim Pisarevsky 2011-05-31 14:24:45 +00:00
parent 63dc1cdd2c
commit af2af3af9b
2 changed files with 18 additions and 2 deletions
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5
modules/features2d/include/opencv2/features2d/features2d.hpp
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@ -236,6 +236,9 @@ public:
float _response=0, int _octave=0, int _class_id=-1)
: pt(x, y), size(_size), angle(_angle),
response(_response), octave(_octave), class_id(_class_id) {}
size_t hash() const;
//! converts vector of keypoints to vector of points
static void convert(const std::vector<KeyPoint>& keypoints,
CV_OUT std::vector<Point2f>& points2f,
@ -257,7 +260,7 @@ public:
CV_PROP_RW int octave; //!< octave (pyramid layer) from which the keypoint has been extracted
CV_PROP_RW int class_id; //!< object class (if the keypoints need to be clustered by an object they belong to)
};
//! writes vector of keypoints to the file storage
CV_EXPORTS void write(FileStorage& fs, const string& name, const vector<KeyPoint>& keypoints);
//! reads vector of keypoints from the specified file storage node

15
modules/features2d/src/keypoint.cpp
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@ -43,7 +43,20 @@
namespace cv
{
size_t KeyPoint::hash() const
{
size_t _Val = 2166136261U, scale = 16777619U;
Cv32suf u;
u.f = pt.x; _Val = (scale * _Val) ^ u.u;
u.f = pt.y; _Val = (scale * _Val) ^ u.u;
u.f = size; _Val = (scale * _Val) ^ u.u;
u.f = angle; _Val = (scale * _Val) ^ u.u;
u.f = response; _Val = (scale * _Val) ^ u.u;
_Val = (scale * _Val) ^ ((size_t) octave);
_Val = (scale * _Val) ^ ((size_t) class_id);
return _Val;
}
void write(FileStorage& fs, const string& objname, const vector<KeyPoint>& keypoints)
{