Method of automatic focussing by digital analysis of the contour

Details Method of automatic focussing by digital analysis of the contour Method of automatic focussing by digital analysis of the contour

1986-03-31

1987-10-20

Rubinson, Gene Z.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 5232

Patent

active

047017821

ABSTRACT:
Method of automatic focussing of a video pickup device having an objective and producing a digital image. According to the invention, this method comprises analyzing the image, within a window, with the aid of at least one digital operator. The digital operator takes the derivatives, in a given direction, of the contours of the image. Thereafter, the absolute values of these derivatives are computed. Finally, a quality parameter defined by the sum, in the window, of the absolute values of the derivatives is calculated. The position of the objective of the pickup device is controlled so as to maximize the value of the quality parameter.

REFERENCES:
patent: 3538334 (1970-11-01), Shaffer, Jr.
patent: 3621136 (1971-11-01), Stanwood
patent: 4354204 (1982-10-01), Kimura
patent: 4392726 (1983-07-01), Kimura
patent: 4616264 (1986-10-01), Pshtissky

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