Image analysis – Image enhancement or restoration – Focus measuring or adjusting
Patent
1995-10-13
1996-10-29
Couso, Jose L.
Image analysis
Image enhancement or restoration
Focus measuring or adjusting
2502012, 359698, 348345, 348347, 348349, 396125, G06K 940, G01J 120, G03B 300, G02B 1514
Patent
active
055704336
ABSTRACT:
The present invention discloses an image defocusing apparatus for defocusing an image formed on a screen by modeling an object in a boundary box by updating pixel values on the image to approximate a lens's focusing effects and a method thereof. The apparatus comprises a unit for computing data related to a circle of confusion for each point in the boundary box, the circle of confusion being a measure how defocused an out-of-focus point is on the screen, a unit for checking a reference pixel whose corresponding point's circle of confusion overlaps a pixel selected as a target pixel, and a unit for updating an original value of the target pixel by taking into account a value of the reference pixel and the data of the target pixel's circle of confusion.
REFERENCES:
patent: 5063375 (1989-09-01), Lien et al.
patent: 5144456 (1990-01-01), Sakano
patent: 5212516 (1993-05-01), Yamada et al.
patent: 5233472 (1993-08-01), Havaguchi et al.
patent: 5281796 (1994-01-01), Kaneda et al.
Potmesil, Michael and Chakravarty, Indranil, "Synthetic Image Generation with a Lens and Aperture Camera Model", ACM, 1990, pp. 86-107.
ACM Transaction on Graphics, vol. 1, No. 2. Apr. 1982, pp. 85-108.
Maenobu Kiyoshi
Nagamine Satoshi
Nishimura Akio
Wakayama Yorihiko
Bella Matthew C.
Couso Jose L.
Matsushita Electric - Industrial Co., Ltd.
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