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Figure 2


Fig. 2. Example of the detection algorithm of interlaced areas. See Materials and methods for further details. (A) Original frame with a close-up of an area with interlacing (boxed) in the upper left corner (contrast is enhanced for illustrative purposes). (B,C) First processing of red and green images. (D) Result of the Boolean `AND' operation between red and green images. (E) Application of the despeckle filter after detection of interlaced area. (F) Final identification of moving areas during sand tossing relative to the source of stimuli. h, antlion head, t, tip of the electromagnetic shaker, hm, interlaced area due to head movement, st, interlaced areas due to flying sand. The yellow point is the centroid of sand tossing areas.





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