New autofocusing technique using the frequency selective weighted median filter for video cameras
IEEE Transactions on Consumer Electronics
An advanced video camera system with robust AF, AE, and AWB control
IEEE Transactions on Consumer Electronics
IEEE Transactions on Consumer Electronics
Implementation of a passive automatic focusing algorithm for digital still camera
IEEE Transactions on Consumer Electronics
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We present an effective and efficient sampling table for auto focus searching algorithms to phone camera modules. Many searching algorithms base on focus value curve, and they do not consider the correlation between sampling and image characterization. Proposed table is calibrated by the camera images to meet results of optical lens, sensor response, noise, image pipeline, compressed method, and focus value function. We verify the algorithms in an image signal processor with mega-pixel level cameras. The table reduces total searching steps from 412 to 16, and images are still sharp. Our searching algorithm with the table can focus a scene within 0.6 seconds from infinity to 8 cm. For further progress, they can easily apply to mobile phones.