DYNAMIC AUTOFOCUS OPERATIONS Abstract Systems, methods, and computer readable media for dynamically adjusting an image capture device's autofocus (AF) operation based, at least in part, on the device's orientation are described. In general, information about an image capture device's orientation may be used to either increase the speed or improve the resolution of autofocus operations. More particularly, orientation information such as that available from an accelerometer may be used to reduce the number of lens positions (points-of-interest) used during an autofocus operation, thereby improving the operation's speed. Alternatively, orientation information may be used to reduce the lens' range of motion while maintaining the number of points-of-interest, thereby improving the operation's resolution. -IU 0n z Q-I r'.J -4 r) L re)I 0 iol '. C-4 4 NS"- C) VIEWING ANGLE UP-FACING ORIENTATION 200a VIEWING SURFACE VIEWING ANGLE VIEWING SURFACE HORIZONTAL-FACING ORIENTATION 200b DOWN-FACING VIEWING SURFACE ORIENTATION 200C / \ / \ VIEWING ANGLE MAX -+lg: UP-FACING (2ooa) Og: HORIZONTAL-FACING (200b) -1g: DOWN-FACING (200C) o MID - - - -- - --.. ... . MIN - FIG. 3 -19 og +ig A2ELEROMETER OUTPUT - G AF MOTION z F +lg: UP-FACING (200a) E Og: HORIZONTAL-FACING (200b) o D-yI -ig: DOWN-FACING (200c) o C - ... U B- :X > A i FIG.5 -1g og +1g A2ELEROMETER OUTPUT SENSOR INPUT ORIENTATION ID RANGE OF STARTING POINT YES IGNORE POI FAST MODE? BELOW STARTING POINT DISTRIBUTE POI USE REMAINING THRU RANGE OF POI THRU RANGE MOTION OF MOTION U) II U- 0 LU) L)U U)U 1-4 0 rU) CU) r~ U ui CU cy-o wC U) U) U U) U) '.0 u. + + POINTS COMPARED + + + + +FG + +-1+ +i++ + + ++ + + + + + + + + 2 REGIONS COMPARED + + + + +>+ + + FG + + +:+