Control of depth of field in three dimensional photography
AssigneeDimensional Development Corporation
InventorsAllen K. W. Lo, Jerry C. Nims
Life of this patent
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Abstract
In a camera for taking stereoscopic photographs, wherein a lenticular screen and photosensitive film are exposed to an object field through a wide effective aperture, the effective aperture size is controlled so that the image of a point on each of the nearest foreground object and the farthest background object in the object field is confined within a region of the lenticular screen which is not greater than 20 lenticules, and preferably not greater than 10 lenticules, in width.
Claims7
In a method for taking a stereoscopic photograph of an object field with a camera of the type having a large effective aperture including a focusing lens and wherein a photosensitive surface located behind a lenticular screen is exposed to the object field through said aperture, the object field including a key subject matter object on which the focusing lens is focused and one or both of a nearest foreground object located closer to the camera than the key subject matter object and a farthest background object located farther from the camera than the key subject matter object, the improvement comprising:
- controlling one or more (1) the distance a from the focusing lens to the nearest foreground object, (2) the distance b from the focusing lens to the farthest background object, (3) the distance k from the focusing lens to the key subject matter object, (4) the focal length F of the lens and (5) the size D of the effective aperture in the direction of lenticule width, such that D is smaller than either:
- ##EQU6## where w is the width in said direction of an individual lenticule.
Dependencies are inferred from the claim text.