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In this paper, a novel complex mask for the implementation of fractional differentiation is deduced. By the combination of fractional differentiation and integration, a new compound derivative is proposed, in which the fractional-order derivative mask is employed. The compound derivative, together with the complex mask, is applied to edge detection, forming a new edge detection operator. The performances...
In this brief, fractional 90-degree phase-shift filtering technique is investigated. First, thanks to the two commonly used Liouville and Weyl fractional integral definitions, we present Liouville and Weyl fractional differintegrators which are generalized magnitude-and-phase modulations. Then, paralleling a Liouville fractional differintegrator with a Weyl fractional differ-integrator to obtain a...
In order to estimate the approach angle and relative height of Unmanned Aircraft Vehicle (UAV) which lands autonomously, a combinational approach of monocular vision and stereo vision is presented. From monocular sequences, vanishing line is extracted by Hough transform and RANSAC algorithm, and then approach angle of UAV is calculated through vanishing line geometry. From stereo sequences, feature-based...
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