A passive auto-focus camera control system
Applied Soft Computing
Auto focusing under microscopic views by integrating multiple measures
CAR'10 Proceedings of the 2nd international Asia conference on Informatics in control, automation and robotics - Volume 1
Autofocusing in digital holographic microscopy
3D Research
Auto-focusing in extreme zoom surveillance: a system approach with application to faces
ISVC'06 Proceedings of the Second international conference on Advances in Visual Computing - Volume Part I
A new sampling method of auto focus for voice coil motor in camera modules
PSIVT'06 Proceedings of the First Pacific Rim conference on Advances in Image and Video Technology
The Weibull manifold in low-level image processing: An application to automatic image focusing
Image and Vision Computing
Short Communication: A rectilinear Gaussian model for estimating straight-line parameters
Journal of Visual Communication and Image Representation
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A practical real-time auto-focus algorithm for a digital camera is presented, and it improves the reliability and speed of the auto-focus process, especially suitable for a mega-pixel high definition camera. The proposed algorithm adopts threshold gradient and edge point count technique besides focus value function, instead of the traditional two-stage climbing search algorithm that uses the focus value function only. Additionally, a relative difference ratio circuit is also proposed, which can implement adaptive step size searching to increase the searching speed. By adopting the modified algorithm on the prototype of our mega-pixel digital camera, the real-time auto-focus function is verified. The proposed algorithm is implemented in a test camera chip that has been manufactured in 0.25μm CMOS digital process.