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Fig. 6. Cuttlefish increase number of false edges or reduce visibility of true
edges in response to different spatial properties of the substrate.
(A–F) First column: original images of animals on substrates
S1–S6. Second column: filtered images using edge-detection algorithm,
Laplacian of Gaussian (LoG). Third column: the same LoG-filtered images of
substrates only (i.e. S1–S6 in Fig.
2). Cuttlefish are difficult to detect, even with LoG
operator.
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