defocus

present singular third person defocuses · present singular third person defocusses · participle present defocusing · participle present defocussing · participle past defocused · past defocused · participle past defocussed · past defocussed

1. transitiveTo cause (a lens, or a beam of light or particles, etc.) to be out of focus.

1. uncountableThe process of going out of focus.
2. uncountableengineeringThe distance by which the focal point is in front of (positive defocus) or beyond (negative defocus) the image or target surface.

   Fundamental to the concept of recovering the depth by measuring defocus is the relationship between the focused and the defocused images of a scene.

   2012, Subhasis Chaudhuri, A. N. Rajagopalan, Depth From Defocus: A Real Aperture Imaging Approach, page 16