Showing content from https://arrayfire.org/docs/group__cv__func__fast.htm below:
ArrayFire: fast
FAST feature detector. More...
AFAPI features fast (const array &in, const float thr=20.0f, const unsigned arc_length=9, const bool non_max=true, const float feature_ratio=0.05f, const unsigned edge=3) C++ Interface for FAST feature detector. More...
AFAPI af_err af_fast (af_features *out, const af_array in, const float thr, const unsigned arc_length, const bool non_max, const float feature_ratio, const unsigned edge) C Interface for FAST feature detector. More...
FAST feature detector.
A circle of radius 3 pixels, translating into a total of 16 pixels, is checked for sequential segments of pixels much brighter or much darker than the central one. For a pixel p to be considered a feature, there must exist a sequential segment of arc_length pixels in the circle around it such that all are greather than (p + thr) or smaller than (p - thr). After all features in the image are detected, if nonmax is true, the non-maximal suppression is applied, checking all detected features and the features detected in its 8-neighborhood and discard it if its score is non maximal.
◆ af_fast() AFAPI af_err af_fast ( af_features * out, const af_array in, const float thr, const unsigned arc_length, const bool non_max, const float feature_ratio, const unsigned edge )
C Interface for FAST feature detector.
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Parameters
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[out] out struct containing arrays for x and y coordinates and score, while array orientation is set to 0 as FAST does not compute orientation, and size is set to 1 as FAST does not compute multiple scales [in] in array containing a grayscale image (color images are not supported) [in] thr FAST threshold for which a pixel of the circle around the central pixel is considered to be greater or smaller [in] arc_length length of arc (or sequential segment) to be tested, must be within range [9-16] [in] non_max performs non-maximal suppression if true [in] feature_ratio maximum ratio of features to detect, the maximum number of features is calculated by feature_ratio * in.elements(). The maximum number of features is not based on the score, instead, features detected after the limit is reached are discarded [in] edge is the length of the edges in the image to be discarded by FAST (minimum is 3, as the radius of the circle)
◆ fast() AFAPI features fast ( const array & in, const float thr = 20.0f, const unsigned arc_length = 9, const bool non_max = true, const float feature_ratio = 0.05f, const unsigned edge = 3 )
C++ Interface for FAST feature detector.
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Parameters
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[in] in array containing a grayscale image (color images are not supported) [in] thr FAST threshold for which a pixel of the circle around the central pixel is considered to be greater or smaller [in] arc_length length of arc (or sequential segment) to be tested, must be within range [9-16] [in] non_max performs non-maximal suppression if true [in] feature_ratio maximum ratio of features to detect, the maximum number of features is calculated by feature_ratio * in.elements(). The maximum number of features is not based on the score, instead, features detected after the limit is reached are discarded [in] edge is the length of the edges in the image to be discarded by FAST (minimum is 3, as the radius of the circle)
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Returns
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features object containing arrays for x and y coordinates and score, while array orientation is set to 0 as FAST does not compute orientation, and size is set to 1 as FAST does not compute multiple scales
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