Depth-of-field control apparatus and image pickup apparatus havi

Details Depth-of-field control apparatus and image pickup apparatus havi Depth-of-field control apparatus and image pickup apparatus havi

1991-04-23

1994-01-25

Mancuso, Joseph

Facsimile and static presentation processing

Facsimile

Recording apparatus

358105, H04N 5232

Patent

active

052820459

ABSTRACT:
An image pickup apparatus for a television and a depth-of-field control apparatus used in the same. Image signals corresponding to a plurality of picture images different in focal point or length position are obtained by a mechanism for changing a focal point or length position to produce a new image signal by composing these image signals through a composition circuit, and motion information of an object is obtained by a circuit for detecting a moving portion in the object to control the image composition by the motion information. The focal point or length position is moved in synchronism with an integer multiple of a vertical scanning period of the television. The image signals corresponding to the plurality of picture images different in focal point or length position are obtained within one vertical scanning period determined by the system of the television. The amount of movement of the focal point or length position is controlled in conjunction with a value of a lens aperture of the camera lens. The image composition is controlled by a composition control circuit made up of a circuit for detecting individual powers of image signals corresponding to a plurality of different picture images, a circuit for comparing the detected powers with each other, and a circuit for detecting the position of an edge included in one of the image signals, wherein a control signal for the image composition produced by the power comparison circuit is compensated by the edge position information obtained by the edge detection circuit.

REFERENCES:
patent: 4404594 (1983-09-01), Hannan
patent: 4584704 (1986-04-01), Ferren
patent: 5031049 (1991-07-01), Toyama et al.
Sugimoto et al., "Digital Composition of Images with Increased Depth of Focus Considering Depth Information" Applied Optics, vol. 24, No. 14, Jul. 15, 1985, pp. 2076-2080.
National Conference Record of the Institute of Electronics and Communication Engineers of Japan, 83/10, vol. J66-D, No. 10.

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