Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1991-10-31
1993-07-13
Razavi, Michael T.
Facsimile and static presentation processing
Facsimile
Recording apparatus
354402, H04N 5232
Patent
active
052278905
ABSTRACT:
The invention provides an apparatus for focusing an object through a lens on an image plane. The apparatus comprises a Z-transformation circuit for receiving a plurality of image data and for generating a Z-transformation polynomial in a given form by subjecting the plurality of image data to Z-transformation; a memory for storing a set of different focus-error distances each assigned a zero which is a value making a Z-transformation polynomial of a corresponding focus-error distance a zero point; calculation circuit for inputting the assigned zero of each of the different focus-error distances into the generated Z-transformation polynomial to select an optimum focus-error distance; and control circuit for moving the lens on the basis of the optimum focus-error distance.
REFERENCES:
patent: 4814889 (1989-03-01), Covey
patent: 4965840 (1990-10-01), Subbarao
patent: 5016110 (1991-05-01), Vuichard et al.
patent: 5061953 (1991-10-01), Higashihara et al.
patent: 5065246 (1991-11-01), Takemoto et al.
patent: 5105278 (1992-04-01), Takemoto et al.
patent: 5148209 (1992-09-01), Subbarao
Bierman Jordan B.
Ho Tuan V.
Konica Corporation
Razavi Michael T.
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