TY - CONF
T1 - Optimal axial interval in estimating depth from defocus
AU - Schechner, Yoav Y.
AU - Kiryati, Nahum
N1 - Funding Information:
Alkali granite, alkali-feldspar granite, alkaline rocks and their associated alkali-rich rocks are referred to as the alkali-rich rocks by Tu Guangzhi (1984). Alkali-rich intrusive rock belts are well developed in the Xinjiang area. One of the authors (Wang Zhonggang, 1991) defined eight alkali-rich intrusive rock belts in northern Xinjiang during his investigations of magmatic rocks there. He also pointed out that the extensive development of alkali-rich intrusive rock belts is an outstanding regionally geological feature in Xinjiang (Wang Zhonggang et al., 1993). The Regional Survey Team and No. 2 Geological Party of the Xinjiang Bureau of Geology and Mineral Resources once also discovered peralkaline rocks (the Kuzigan and Zankan massifs) and alkali granites (the Lapeiquan, Datonggou-Beishan and Beilisai massifs) (Bureau of Geology and Mineral Resources of Xinjiang Uygur Autonomous Region, 1993 ; No. 2 Geological Party of the Bureau of Geology and Mineral Resources of Xinjiang Uygur Autonomous Region, 1985). During the years from 1996 to 2000 our special research group discovered the Dongshan and Tula alkali granites ~ along the deep giant fault zone where alkali-rich intrusive massifs are known in the study of magmatic rocks in the Mt. Kunlun-Mt. Altun region of southern Xinjiang, and also noticed that there was developed the Gez alkali granite along the Taxkorgan fault where there are distributed the Kuzigan alkaline rocks (after Ding Daogui et al., 1996) . In addition, the special research group under the 3 0 5 Research Program also discovered the alkali-rich intrusive rocks associated ISSN 1000-9426 * Granted jointly by the State 305 Research Program and the National Natural Science Foundation of China (Grant No. 493333030). (D Wang Zhonggange t al., 2000, Magmatic activities and metallogenesis in the Kunlun-Altun region, Xinjiang, p. 42 - 82 (in Chinese).
PY - 1999
Y1 - 1999
N2 - We analyze the effect of perturbations on the estimation of Depth from Defocus (DFD) implemented by changing the focus setting (e.g., axially moving the sensor). The analysis yields the optimal change of focus setting, and the spatial frequencies for which estimation is most robust. For stable estimation at all spatial frequencies, the change in focus setting should be less than twice the depth of field. For the most robust estimation in the highest spatial frequencies the axial interval should be equal to the depth of field.
AB - We analyze the effect of perturbations on the estimation of Depth from Defocus (DFD) implemented by changing the focus setting (e.g., axially moving the sensor). The analysis yields the optimal change of focus setting, and the spatial frequencies for which estimation is most robust. For stable estimation at all spatial frequencies, the change in focus setting should be less than twice the depth of field. For the most robust estimation in the highest spatial frequencies the axial interval should be equal to the depth of field.
UR - http://www.scopus.com/inward/record.url?scp=0033283854&partnerID=8YFLogxK
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AN - SCOPUS:0033283854
SP - 843
EP - 848
T2 - Proceedings of the 1999 7th IEEE International Conference on Computer Vision (ICCV'99)
Y2 - 20 September 1999 through 27 September 1999
ER -