CCD auto-focusing algorithm for board to board socket inspection

Yean Ren Hwang, Mei Chao Liu, Yi Ming Chen

Research output: Contribution to journalArticlepeer-review

Abstract

This paper presents a new auto-focusing algorithm for CCD cameras used for the on-line board-to-board socket inspection. There are two focusing procedures in this algorithm, i.e. rough focusing and accurate focusing. First, the camera's lens is quickly moved to a position close to the best focusing position in the rough focusing procedure. Secondly, the lens is adjusted with small step length to achieve the best focusing position in the accurate focusing procedure. Compared to the traditional mountain climbing method, experiment results show that our algorithm reaches the best focusing position in fewer steps.

Original languageEnglish
Pages (from-to)237-243
Number of pages7
JournalInternational Journal of Computer Applications in Technology
Volume13
Issue number3-5
DOIs
StatePublished - 2000

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