Skip to main content
SpringerLink
Log in

A fast focusing method for CCM autofocusing handlers

  • ORIGINAL ARTICLE
  • Published:
The International Journal of Advanced Manufacturing Technology Aims and scope Submit manuscript

Abstract

This paper proposes an autofocusing (AF) method for production of compact camera module (CCM). The CCM AF handlers are mainly used in the final CCM production stage to measure and adjust the lens focus of CCMs. To improve the productivity of CCM AF handlers, we propose an efficient focusing method adjusting the lens focus quickly. The max–min difference method is newly developed to compute the focus value efficiently, and two-stage searching method is also developed to find the best focus position quickly. Experimental results are presented to verify the usefulness of the proposed method.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. Nayar SK, Nakagawa Y (1994) Shape from focus. IEEE Trans Pattern Anal Mach Intell 16(8):824–831 doi:10.1109/34.308479

    Article  Google Scholar 

  2. Lee SH, Kim JH, Choi BT, Ko SJ (1988) Auto-focusing algorithm for video camera using the difference of medians. J Korea Inf Commun Soc 23(1):41–50

    Google Scholar 

  3. Lee JH, Kim KS, Nam BD, Lee JC, Kwon YM, Kim HG (1995) Implementation of a passive automatic focusing algorithm for digital still camera. IEEE Trans Consum Electron 41(3):449–453 doi:10.1109/30.468047

    Article  Google Scholar 

  4. Shin SH (2001) A new auto-focusing algorithm for digital cameras (2001). J Korea Inst Electr Engineers 50(9):447–453

    Google Scholar 

  5. Choi KS, Lee JS, Ko SJ (1999) New auto-focus technique using the frequency selective weighted median filter for video cameras. IEEE Trans Consum Electron 45(3):820–827 doi:10.1109/30.793616

    Article  Google Scholar 

  6. He J, Zhou R, Hong Z (2003) Modified fast climbing search auto-focus algorithm with adaptive step size searching technique for digital camera. IEEE Trans Consum Electron 49(2):257–262 doi:10.1109/TCE.2003.1209511

    Article  Google Scholar 

  7. Born M, Wolf E (1999) Principles of optics. Cambridge Univ. Press, Cambridge

    Google Scholar 

  8. Gonzalez RC (2002) Digital image processing. Prentice Hall, Seoul

    Google Scholar 

  9. Jarvis RA (1976) Focus optimization criteria for computer image processing. Microscope 24(2):163–180

    Google Scholar 

  10. Koizumi T, Chun HS, Zen H (1996) A new optical detector for a high-speed AF control. IEEE Trans Consum Electron 42(4):1055–1061 doi:10.1109/30.555905

    Article  Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Department of Control and Instrumentation Eng., Chungbuk National Univ., Cheongju, South Korea

    Hee-Sang Yoon & Tae-Hyoung Park

Authors
  1. Hee-Sang Yoon
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Tae-Hyoung Park
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Tae-Hyoung Park.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Yoon, HS., Park, TH. A fast focusing method for CCM autofocusing handlers. Int J Adv Manuf Technol 43, 287–293 (2009). https://doi.org/10.1007/s00170-008-1706-z

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s00170-008-1706-z

Keywords

Search

Navigation