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. Author manuscript; available in PMC: 2010 Sep 21.
Published in final edited form as: J Opt Soc Am A Opt Image Sci Vis. 2001 Mar;18(3):473–488. doi: 10.1364/josaa.18.000473

Fig. 5.

Fig. 5

Sample images used in the exposure-time study. The higher-frequency quantum noise component is reduced as exposure time goes up. A. Low-exposure time (experiment 1: Wa/Wq = 0.528). B. Midrange exposure time (experiment 3: Wa/Wq = 29.70). C. High-exposure time (experiment 5: Wa/Wq = 1223.7).