Image analysis – Image enhancement or restoration – Focus measuring or adjusting
Patent
1998-08-28
2000-11-28
Lee, Thomas D.
Image analysis
Image enhancement or restoration
Focus measuring or adjusting
2502012, 348345, 348354, G06K 940
Patent
active
061545740
ABSTRACT:
Digital focusing method and apparatus in an image processing system, for digitally focusing an out-of-focus image, are provided. A defocused image is divided into sub-images of a predetermined size. An edge direction of each of the divided sub-images is estimated. Step responses with respect to the respective edge directions are calculated. A mean step response is obtained by averaging a predetermined number of the step responses. Point Spread Function (PSF) coefficients are obtained using the mean step response. An image blur transfer function is obtained using the PSF coefficients. An image restoration transfer function is obtained using the image blur transfer function. An original in-focused image is obtained by multiplying the image restoration transfer function by the defocused image in a frequency domain. Thus, an image can be restored in real time, and the size and weight of the image processing system can be reduced.
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patent: 5570433 (1996-10-01), Nagamine et al.
patent: 5710829 (1998-01-01), Chen et al.
patent: 6067114 (2000-05-01), Omata et al.
Kim Sang-ku
Lee Chul Ho
Paik Joon Ki
Lee Thomas D.
Samsung Electronics Co,. Ltd.
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