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Figure 2
Illustration of gradients of eight neighbours. Blue solid lines represent gradients of four neighbours, and blue solid lines and blue dotted lines on the diagonal represent gradients of eight neighbours. Here, east (E), west (W), south (S), north (N), southeast (SE), southwest (SW), northeast (NE) and northwest (NW) denote eight directions.

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ISSN: 1600-5775
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