Scene-based method for determining focus

Details Scene-based method for determining focus Scene-based method for determining focus

2007-01-30

2007-01-30

Wu, Jingge (Department: 2624)

Image analysis

Image enhancement or restoration

Focus measuring or adjusting

C382S274000, C382S275000, C382S291000, C358S001500, C358S003270

Reexamination Certificate

active

10427398

ABSTRACT:
A method and application specific integrated circuit for determining focus for an image capture system using scene content within an image, including the steps of: acquiring, from the image, image data having different focus positions; dividing the image data into sub-images; calculating a sub-image sharpness value for each sub-image; calculating an image sharpness value for each focus position using the sub-image sharpness values; plotting the sharpness values versus the focus position; fitting a curve to the plot of the image sharpness values versus the focus position, wherein the curve has a peak sharpness value; and determining the focus of the image capture system from a point on the curve.

REFERENCES:
patent: 4183642 (1980-01-01), Fukuoka
patent: 5166506 (1992-11-01), Fiete et al.
patent: 5338924 (1994-08-01), Barrett et al.
patent: 5693439 (1997-12-01), Tanaka et al.
patent: 5832931 (1998-11-01), Wachter et al.
patent: 6023056 (2000-02-01), Fiete et al.

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