Abstract
We apply the filter bank method, which extracts from a strongly defocused image the information on the amount of defocus, i.e., the information on the object distance, and simultaneously restores the object, to a defocused image of extremely low intensity, which is detectable only with a photon counting camera. Experimental results show that the information of the defocus amount can be extracted from such a blurred photon image, and the original object itself is simultaneously restored. The influence of the photon noise on the distance estimation is also quantitatively investigated. Then, the maximum likelihood-expectation maximization (ML-EM) method is adopted for image restoration, and the results are compared with those obtained by applying the conventional Wiener filter, It is experimentally shown that the ML-EM produces better image restoration than the Wiener filter in the extremely low intensity region where the maximal number of photons per pixel does not exceed about 450.
| Original language | English |
|---|---|
| Pages (from-to) | 1024-1028 |
| Number of pages | 5 |
| Journal | Optical Engineering |
| Volume | 42 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2003 Apr |
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Keywords
- Image restoration
- Photon-limited imaging
- Range finding
- Semi-blind deconvolution
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
Cite this
Simultaneous image restoration and distance estimation of an object from a strongly defocused photon image. / Ono, Shinya; Komatsu, Shinichi.
In: Optical Engineering, Vol. 42, No. 4, 04.2003, p. 1024-1028.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Simultaneous image restoration and distance estimation of an object from a strongly defocused photon image
AU - Ono, Shinya
AU - Komatsu, Shinichi
PY - 2003/4
Y1 - 2003/4
N2 - We apply the filter bank method, which extracts from a strongly defocused image the information on the amount of defocus, i.e., the information on the object distance, and simultaneously restores the object, to a defocused image of extremely low intensity, which is detectable only with a photon counting camera. Experimental results show that the information of the defocus amount can be extracted from such a blurred photon image, and the original object itself is simultaneously restored. The influence of the photon noise on the distance estimation is also quantitatively investigated. Then, the maximum likelihood-expectation maximization (ML-EM) method is adopted for image restoration, and the results are compared with those obtained by applying the conventional Wiener filter, It is experimentally shown that the ML-EM produces better image restoration than the Wiener filter in the extremely low intensity region where the maximal number of photons per pixel does not exceed about 450.
AB - We apply the filter bank method, which extracts from a strongly defocused image the information on the amount of defocus, i.e., the information on the object distance, and simultaneously restores the object, to a defocused image of extremely low intensity, which is detectable only with a photon counting camera. Experimental results show that the information of the defocus amount can be extracted from such a blurred photon image, and the original object itself is simultaneously restored. The influence of the photon noise on the distance estimation is also quantitatively investigated. Then, the maximum likelihood-expectation maximization (ML-EM) method is adopted for image restoration, and the results are compared with those obtained by applying the conventional Wiener filter, It is experimentally shown that the ML-EM produces better image restoration than the Wiener filter in the extremely low intensity region where the maximal number of photons per pixel does not exceed about 450.
KW - Image restoration
KW - Photon-limited imaging
KW - Range finding
KW - Semi-blind deconvolution
UR - http://www.scopus.com/inward/record.url?scp=0038679505&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0038679505&partnerID=8YFLogxK
U2 - 10.1117/1.1557161
DO - 10.1117/1.1557161
M3 - Article
VL - 42
SP - 1024
EP - 1028
JO - Optical Engineering
JF - Optical Engineering
SN - 0091-3286
IS - 4
ER -