Focused image recovery from two defocused images recorded withdifferent camera settings
Subbarao, M.
Tse-Chung Wei
Surya, G.
Dept. of Electr. Eng., State Univ. of New York, Stony Brook, NY;
Abstract
Two new methods are presented for recovering the focused image of
an object from only two blurred images recorded with different camera
parameter settings. First a blur parameter σ is estimated using
one of our two recently proposed depth-from-defocus methods. Then one of
the two blurred images is deconvolved to recover the focused image. The
first method requires only the knowledge of σ of the camera's
point spread function (PSF). It is based on a new spatial domain
convolution/deconvolution transform. The second method requires full
knowledge of the form of the PSF and is estimated using step edges. The
focused image is obtained through deconvolution in the Fourier Domain
using the Wiener filter. For both methods, results of experiments on
actual defocused images recorded by a CCD camera are presented. The
first method requires less computation and gives satisfactory results
for up to medium levels of blur. The second method gives good results
for up to relatively high levels of blur
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