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Merge pull request #18001 from Yosshi999:sift-8bit-descr

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* 8-bit SIFT descriptors

* use clearer parameter

* update docs

* propagate type info

* overload function for avoiding ABI-break

* bugfix: some values are undefined when CV_SIMD is absent
This commit is contained in:
Yosshi999
2020-08-17 19:28:44 +09:00
committed by GitHub
parent b34234ac14
commit 1834eed809
4 changed files with 158 additions and 42 deletions
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modules/features2d/include/opencv2/features2d.hpp
+27
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@@ -301,6 +301,33 @@ public:
double contrastThreshold = 0.04, double edgeThreshold = 10,
double sigma = 1.6);
/** @brief Create SIFT with specified descriptorType.
@param nfeatures The number of best features to retain. The features are ranked by their scores
(measured in SIFT algorithm as the local contrast)
@param nOctaveLayers The number of layers in each octave. 3 is the value used in D. Lowe paper. The
number of octaves is computed automatically from the image resolution.
@param contrastThreshold The contrast threshold used to filter out weak features in semi-uniform
(low-contrast) regions. The larger the threshold, the less features are produced by the detector.
@note The contrast threshold will be divided by nOctaveLayers when the filtering is applied. When
nOctaveLayers is set to default and if you want to use the value used in D. Lowe paper, 0.03, set
this argument to 0.09.
@param edgeThreshold The threshold used to filter out edge-like features. Note that the its meaning
is different from the contrastThreshold, i.e. the larger the edgeThreshold, the less features are
filtered out (more features are retained).
@param sigma The sigma of the Gaussian applied to the input image at the octave \#0. If your image
is captured with a weak camera with soft lenses, you might want to reduce the number.
@param descriptorType The type of descriptors. Only CV_32F and CV_8U are supported.
*/
CV_WRAP static Ptr<SIFT> create(int nfeatures, int nOctaveLayers,
double contrastThreshold, double edgeThreshold,
double sigma, int descriptorType);
CV_WRAP virtual String getDefaultName() const CV_OVERRIDE;
};