US 9,813,609 B2
System and method for automatic focusing based on statistical data
Lifu Yu, Guangdong (CN); and Zisheng Cao, Guangdong (CN)
Assigned to SZ DJI TECHNOLOGY CO., LTD., Shenzhen (CN)
Filed by SZ DJI TECHNOLOGY CO., LTD., Shenzhen, Guangdong (CN)
Filed on Oct. 12, 2016, as Appl. No. 15/291,525.
Application 15/291,525 is a continuation of application No. 14/972,889, filed on Dec. 17, 2015, granted, now 9,509,898.
Application 14/972,889 is a continuation of application No. PCT/CN2014/087546, filed on Sep. 26, 2014.
Prior Publication US 2017/0034427 A1, Feb. 2, 2017
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 5/232 (2006.01); G02B 7/09 (2006.01); H04N 5/369 (2011.01)
CPC H04N 5/23212 (2013.01) [H04N 5/3696 (2013.01); G02B 7/09 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for automatic focusing a camera having a lens, comprising:
calculating focus measure values for a plurality of lens positions, each of the focus measure values being calculated by dividing a weighted sum of window evaluation values of a set of image focusing windows by a total area of the set of image focusing windows;
comparing the calculated focus measure values of the plurality of lens positions in order to select an optimal lens position; and
moving the lens to the selected optimal lens position.