| Summary: | VideoSAR (Video Synthetic Aperture Radar) technology provides an important mean for real-time and continuous earth observation, whereas the ever-changing scattering characteristics may destroy the accuracy of target motion perception and bring in massive false alarms subsequently. False alarms emerge easily in the edge region for its sharper variations of the scattering characteristics. Utilizing the gradient difference between the target shadow edge and other edge regions in the image, this letter proposes a VideoSAR false alarm reduction method based on gradient-weighted edge information. By considering the reasonable gradient and area of the overlapping edge region between changing region and background, this method could reduce the amount of false alarms (<inline-formula> <math display="inline"> <semantics> <mrow> <msub> <mi>P</mi> <mrow> <mi>f</mi> <mi>a</mi> </mrow> </msub> <mo>=</mo> <mn>18</mn> <mo>.</mo> <mn>4</mn> <mo>%</mo> </mrow> </semantics> </math> </inline-formula>) and retain the correct shadow of moving target (<inline-formula> <math display="inline"> <semantics> <mrow> <msub> <mi>P</mi> <mi>d</mi> </msub> <mo>=</mo> <mn>74</mn> <mo>.</mo> <mn>8</mn> <mo>%</mo> </mrow> </semantics> </math> </inline-formula>). Experiments on a real footage verify the excellent effect of the proposed method.
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