In order to obtain image features that can be well exploited in long distance target recognition and are computationally efficient
an algorithm combining scale-space FAST (Features from Accelerated Segment Test) corner detector and SURF (Speeded Up Robust Features) descriptor
is proposed in this paper. The Fast-Hessian matrix based keypoint detector used SURF algorithm
is apt to extract numerous keypoints from non-informative edges with relatively high Fast-Hessian response
leading to considerable amounts of low-distinctive feature and consequently high rates of mismatch; with Gaussian filters employed
the possible amount of keypoints extracted with Fast-Hessian from regions of small targets is largely reduced due to image blur
which leaves difficulty for recognition of long distance targets. To address these problems
the proposed method uses a scale-space FAST corner detector in place of the Fast-Hessian detector
combining with SURF descriptor for its distinctiveness. The proposed method effectively eliminates the problem of extracting interfering keypoints along image edges
performing a significantly better detection of keypoints on long distance targets than Fast-Hessian
and generates features of better distinctiveness than BRISK features
which uses FAST as well. The experimental results indicate that the recognition algorithm based on the proposed features gives better performance against targets with change in scale
illumination and 3D viewpoint than that either based on SIFT
SURF or BRISK; the proposed feature can be well applied to long distance target recognition
while reaching a comparable computation speed to SURF.
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references
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