A Seriously Defocused Spider
Optics & Photonics Focus
Volume 17 Story 3 - 7/6/2012

Depth from defocus

Theoretically, the amount of image defocus (i.e., how much an image is defocused) can be used as an absolute depth cue by comparing a defocused image with one or more additional images in which the same object is sharply focused or differently defocused. Picture credits: Akihisa Terakita, Mitsumasa Koyanagi and Takashi Nagata.
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Depth from defocus. Theoretically, the amount of image defocus (i.e., how much an image is defocused) can be used as an absolute depth cue by comparing a defocused image with one or more additional images in which the same object is sharply focused or differently defocused.