13 September 2002 Fast auto-focus approach based on green components analysis
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In the previous literature, the focusing measures usually analysis the gray image converted from color image when the focusing target image is color one. Here a fast auto-focusing approach based on green components analysis is put forward. The color CCD (Charge Coupled Device) has three types elements. They are respectively sensitive to red light (so be called Red element), green light (Green element), or blue light (Blue element). But they are not very "pure". For example, the green element is not only sensitive to green light, but also sensitive to red one and blue one. The most photography scenes always include the "Green object" which is sensitive to the above green element. So it is possible to analysis only the green image instead the gray one converted from color one, to decide the taken image is focused or not. The results show the fast auto-focusing approach based on green image analysis is similarly valid. Because the time which be used to get gray image from color image in general auto-focusing approach has been omitted, the auto-focusing speed of digital system will be increased about 2 times by using our new approach. In the paper, the auto-focusing time has been discussed.
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Huajun Feng, Huajun Feng, Qi Li, Qi Li, Zhi Hai Xu, Zhi Hai Xu, } "Fast auto-focus approach based on green components analysis", Proc. SPIE 4922, Color Science and Imaging Technologies, (13 September 2002); doi: 10.1117/12.483125; https://doi.org/10.1117/12.483125


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