Abstract

A multi-parameter fusion algorithm (MPFA) for auto-focus (AF) is discussed. The image sharpness evaluation algorithm (ISEA) and zoom tracking method (ZTM) are combined for AF. The zoom motor position (z) and background complexity (c) are regarded as the main parameters of this algorithm. A priority table depending on z and c is proposed. Modified ISEA or ZTM is adopted according to the priority table value. The hardware implementation of the MPFA on Texas Instruments' Davinci digital signal processor is also provided. Results show that the proposed scheme provides faster focusing compared with the conventional approaches.

© 2010 Chinese Optics Letters

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  2. L. Zhao, W. Jin, Y. Chen, and B. Su, Acta Opt. Sin. (in Chinese) 28, 1703 (2008).
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  17. J.-S. Lee, S.-J. Ko, Y. Kim, and A. Morales, in Proceedings of International Conference on Consumer Electronics 56 (2002).
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2008 (6)

Y. Liu, C. Sui, and B. Li, Acta Opt. Sin. (in Chinese) 28, 1124 (2008).

L. Zhao, W. Jin, Y. Chen, and B. Su, Acta Opt. Sin. (in Chinese) 28, 1703 (2008).

C. Yu, B. Chang, and D. Wei, Chin. Opt. Lett. 6, 502 (2008).

L. Li, Q. Zeng, and F. Meng, Chin. Opt. Lett. 6, 827 (2008).

R. Fu, F. Shao, G. Jiang, and M. Yu, Chin. Opt. Lett. 6, 654 (2008).

M. Sun, G. Zong, D. Dong, and J. Shi, Acta Opt. Sin. (in Chinese) 28, 1117 (2008).

2006 (1)

S.-M. Sohn, S.-H. Yang, S.-W. Kim, K.-H. Baek, and W. H. Paik, IEEE Trans. Consumer Electron. 52, 10 (2006).

2005 (1)

V. Peddigari and N. Kehtarnavaz, IEEE Trans. Consumer Electron. 51, 1051 (2005).

2004 (1)

C. Weerasinghe, M. Nilsson, S. Lichman, and I. Kharitonenko, IEEE Trans. Consumer Electron. 50, 777 (2004).

2003 (1)

N. Kehtarnavaz and H.-J. Oh, Real-Time Imaging 9, 197 (2003).

2002 (2)

Q. Li, H. Feng, Z. Xu, M. Bian, S. Shen, and R. Dai, Acta. Photon. Sin. (in Chinese) 31, 736 (2002).

Y. Kim, J.-S. Lee, A. W. Morales, and S.-J. Ko, IEEE Trans. Consumer Electron. 48, 428 (2002).

Baek, K.-H.

S.-M. Sohn, S.-H. Yang, S.-W. Kim, K.-H. Baek, and W. H. Paik, IEEE Trans. Consumer Electron. 52, 10 (2006).

Bian, M.

Q. Li, H. Feng, Z. Xu, M. Bian, S. Shen, and R. Dai, Acta. Photon. Sin. (in Chinese) 31, 736 (2002).

Chang, B.

Chen, Y.

L. Zhao, W. Jin, Y. Chen, and B. Su, Acta Opt. Sin. (in Chinese) 28, 1703 (2008).

Dai, R.

Q. Li, H. Feng, Z. Xu, M. Bian, S. Shen, and R. Dai, Acta. Photon. Sin. (in Chinese) 31, 736 (2002).

Dong, D.

M. Sun, G. Zong, D. Dong, and J. Shi, Acta Opt. Sin. (in Chinese) 28, 1117 (2008).

Feng, H.

Q. Li, H. Feng, Z. Xu, M. Bian, S. Shen, and R. Dai, Acta. Photon. Sin. (in Chinese) 31, 736 (2002).

Fu, R.

Jiang, G.

Jin, W.

L. Zhao, W. Jin, Y. Chen, and B. Su, Acta Opt. Sin. (in Chinese) 28, 1703 (2008).

Kehtarnavaz, N.

V. Peddigari and N. Kehtarnavaz, IEEE Trans. Consumer Electron. 51, 1051 (2005).

N. Kehtarnavaz and H.-J. Oh, Real-Time Imaging 9, 197 (2003).

Kharitonenko, I.

C. Weerasinghe, M. Nilsson, S. Lichman, and I. Kharitonenko, IEEE Trans. Consumer Electron. 50, 777 (2004).

Kim, S.-W.

S.-M. Sohn, S.-H. Yang, S.-W. Kim, K.-H. Baek, and W. H. Paik, IEEE Trans. Consumer Electron. 52, 10 (2006).

Kim, Y.

Y. Kim, J.-S. Lee, A. W. Morales, and S.-J. Ko, IEEE Trans. Consumer Electron. 48, 428 (2002).

Ko, S.-J.

Y. Kim, J.-S. Lee, A. W. Morales, and S.-J. Ko, IEEE Trans. Consumer Electron. 48, 428 (2002).

Lee, J.-S.

Y. Kim, J.-S. Lee, A. W. Morales, and S.-J. Ko, IEEE Trans. Consumer Electron. 48, 428 (2002).

Li, B.

Y. Liu, C. Sui, and B. Li, Acta Opt. Sin. (in Chinese) 28, 1124 (2008).

Li, L.

Li, Q.

Q. Li, H. Feng, Z. Xu, M. Bian, S. Shen, and R. Dai, Acta. Photon. Sin. (in Chinese) 31, 736 (2002).

Lichman, S.

C. Weerasinghe, M. Nilsson, S. Lichman, and I. Kharitonenko, IEEE Trans. Consumer Electron. 50, 777 (2004).

Liu, Y.

Y. Liu, C. Sui, and B. Li, Acta Opt. Sin. (in Chinese) 28, 1124 (2008).

Meng, F.

Morales, A. W.

Y. Kim, J.-S. Lee, A. W. Morales, and S.-J. Ko, IEEE Trans. Consumer Electron. 48, 428 (2002).

Nilsson, M.

C. Weerasinghe, M. Nilsson, S. Lichman, and I. Kharitonenko, IEEE Trans. Consumer Electron. 50, 777 (2004).

Oh, H.-J.

N. Kehtarnavaz and H.-J. Oh, Real-Time Imaging 9, 197 (2003).

Paik, W. H.

S.-M. Sohn, S.-H. Yang, S.-W. Kim, K.-H. Baek, and W. H. Paik, IEEE Trans. Consumer Electron. 52, 10 (2006).

Peddigari, V.

V. Peddigari and N. Kehtarnavaz, IEEE Trans. Consumer Electron. 51, 1051 (2005).

Shao, F.

Shen, S.

Q. Li, H. Feng, Z. Xu, M. Bian, S. Shen, and R. Dai, Acta. Photon. Sin. (in Chinese) 31, 736 (2002).

Shi, J.

M. Sun, G. Zong, D. Dong, and J. Shi, Acta Opt. Sin. (in Chinese) 28, 1117 (2008).

Sohn, S.-M.

S.-M. Sohn, S.-H. Yang, S.-W. Kim, K.-H. Baek, and W. H. Paik, IEEE Trans. Consumer Electron. 52, 10 (2006).

Su, B.

L. Zhao, W. Jin, Y. Chen, and B. Su, Acta Opt. Sin. (in Chinese) 28, 1703 (2008).

Sui, C.

Y. Liu, C. Sui, and B. Li, Acta Opt. Sin. (in Chinese) 28, 1124 (2008).

Sun, M.

M. Sun, G. Zong, D. Dong, and J. Shi, Acta Opt. Sin. (in Chinese) 28, 1117 (2008).

Weerasinghe, C.

C. Weerasinghe, M. Nilsson, S. Lichman, and I. Kharitonenko, IEEE Trans. Consumer Electron. 50, 777 (2004).

Wei, D.

Xu, Z.

Q. Li, H. Feng, Z. Xu, M. Bian, S. Shen, and R. Dai, Acta. Photon. Sin. (in Chinese) 31, 736 (2002).

Yang, S.-H.

S.-M. Sohn, S.-H. Yang, S.-W. Kim, K.-H. Baek, and W. H. Paik, IEEE Trans. Consumer Electron. 52, 10 (2006).

Yu, C.

Yu, M.

Zeng, Q.

Zhao, L.

L. Zhao, W. Jin, Y. Chen, and B. Su, Acta Opt. Sin. (in Chinese) 28, 1703 (2008).

Zong, G.

M. Sun, G. Zong, D. Dong, and J. Shi, Acta Opt. Sin. (in Chinese) 28, 1117 (2008).

Acta Opt. Sin. (in Chinese) (3)

Y. Liu, C. Sui, and B. Li, Acta Opt. Sin. (in Chinese) 28, 1124 (2008).

L. Zhao, W. Jin, Y. Chen, and B. Su, Acta Opt. Sin. (in Chinese) 28, 1703 (2008).

M. Sun, G. Zong, D. Dong, and J. Shi, Acta Opt. Sin. (in Chinese) 28, 1117 (2008).

Acta. Photon. Sin. (in Chinese) (1)

Q. Li, H. Feng, Z. Xu, M. Bian, S. Shen, and R. Dai, Acta. Photon. Sin. (in Chinese) 31, 736 (2002).

Chin. Opt. Lett. (3)

IEEE Trans. Consumer Electron. (4)

V. Peddigari and N. Kehtarnavaz, IEEE Trans. Consumer Electron. 51, 1051 (2005).

C. Weerasinghe, M. Nilsson, S. Lichman, and I. Kharitonenko, IEEE Trans. Consumer Electron. 50, 777 (2004).

S.-M. Sohn, S.-H. Yang, S.-W. Kim, K.-H. Baek, and W. H. Paik, IEEE Trans. Consumer Electron. 52, 10 (2006).

Y. Kim, J.-S. Lee, A. W. Morales, and S.-J. Ko, IEEE Trans. Consumer Electron. 48, 428 (2002).

Real-Time Imaging (1)

N. Kehtarnavaz and H.-J. Oh, Real-Time Imaging 9, 197 (2003).

Other (6)

T.-K. Kim, J.-S. Sohn, S.-H. Lee, K.-R. Kwon, and D.-G. Kim, in Proceedings of 2006 IEEE International Conference on Acoustics, Speech and Signal Processing 3, 1188 (2006).

Y. He, J. Cui, T. Tan, and Y. Wang, in Proceedings of the 18th International Conference on Pattern Recognition 4, 557 (2006).

J.-S. Lee, S.-J. Ko, Y. Kim, and A. Morales, in Proceedings of International Conference on Consumer Electronics 56 (2002).

Y. Song and M. Li, in Proceedings of the 2006 IEEE International Conference on Mechatronics and Automation 1237 (2006).

C.-H. Shen and H. H. Chen, in Proceedings of International Conference on Consumer Electronics 69 (2006).

F. Li and H. Jin, in Proceedings of the Fourth International Conference on Machine Learning and Cybernetics 5001 (2005).

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