Abstract
Application extended Kalman filter (EKF) based hand-shake detector to an optical image stabilization (OIS) stabilized by fuzzy sliding-mode controller (FSMC) is proposed in this paper to enhance the image sharpness and stabilization rate (SR) of digital cameras. A low-cost gyroscope is used to sense the hand-shake vibration independently in dual-axis and the EKF is designed to online tune the parameters of hand-shake detector for improving the phase-shift phenomenon. The proposed EKF based handshake detector determines the time-varying hand-shake vibration and adopts a multi-rate strategy to reduce the computational load. The developed OIS system equipped with the FSMC and EKF based hand-shake detector is implemented in a fixed-point 16-bit microcontroller. The OIS performance is improved by the EKF based hand-shake detector in the target frequency range 2-12 Hz, and the best SR is -30.46 dB at 8Hz and the largest improvement is 1.82 times (dB) at 2 Hz1.
Original language | English |
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Article number | 6490249 |
Pages (from-to) | 113-121 |
Number of pages | 9 |
Journal | IEEE Transactions on Consumer Electronics |
Volume | 59 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2013 Apr 17 |
All Science Journal Classification (ASJC) codes
- Media Technology
- Electrical and Electronic Engineering