Low-power passive focus measure operator based on the DCT for mobile phones

S. Y. Lee; Y. Kumar; J. M. Cho; S. W. Kim

doi:10.1179/174313108X344470

Low-power passive focus measure operator based on the DCT for mobile phones

S. Y. Lee, Y. Kumar, J. M. Cho, S. W. Kim

* Honorary professors

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

A new focus measure operator applicable in the auto-focus function of a mobile phone has been presented. The proposed operator uses the middle frequency component of a discrete cosine transform to calculate the focus value of an image. Experimental results from various sample images show that the proposed operator requires a minimum number of operations (at least 1/5 for addition and 1/16 for multiplication) and produces reliable focus values with low auto-focusing uncertainty measure as compared to the other operators.

Original language	English
Pages (from-to)	301-306
Number of pages	6
Journal	Imaging Science Journal
Volume	56
Issue number	6
DOIs	https://doi.org/10.1179/174313108X344470
Publication status	Published - 2008 Dec

Keywords

Auto-focus
DCT
Focus-value
Mobile phone

ASJC Scopus subject areas

Media Technology
Computer Vision and Pattern Recognition

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10.1179/174313108X344470

Cite this

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abstract = "A new focus measure operator applicable in the auto-focus function of a mobile phone has been presented. The proposed operator uses the middle frequency component of a discrete cosine transform to calculate the focus value of an image. Experimental results from various sample images show that the proposed operator requires a minimum number of operations (at least 1/5 for addition and 1/16 for multiplication) and produces reliable focus values with low auto-focusing uncertainty measure as compared to the other operators.",

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AB - A new focus measure operator applicable in the auto-focus function of a mobile phone has been presented. The proposed operator uses the middle frequency component of a discrete cosine transform to calculate the focus value of an image. Experimental results from various sample images show that the proposed operator requires a minimum number of operations (at least 1/5 for addition and 1/16 for multiplication) and produces reliable focus values with low auto-focusing uncertainty measure as compared to the other operators.

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Low-power passive focus measure operator based on the DCT for mobile phones

Abstract

Keywords

ASJC Scopus subject areas

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