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

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

Access to Document

10.1179/174313108X344470

Cite this

@article{173fc165b3624d41ba89733d1b6dbf88,

title = "Low-power passive focus measure operator based on the DCT for mobile phones",

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.",

keywords = "Auto-focus, DCT, Focus-value, Mobile phone",

author = "Lee, \{S. Y.\} and Y. Kumar and Cho, \{J. M.\} and Kim, \{S. W.\}",

year = "2008",

month = dec,

doi = "10.1179/174313108X344470",

language = "English",

volume = "56",

pages = "301--306",

journal = "Imaging Science Journal",

issn = "1368-2199",

publisher = "Maney Publishing",

number = "6",

}

TY - JOUR

T1 - Low-power passive focus measure operator based on the DCT for mobile phones

AU - Lee, S. Y.

AU - Kumar, Y.

AU - Cho, J. M.

AU - Kim, S. W.

PY - 2008/12

Y1 - 2008/12

N2 - 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.

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.

KW - Auto-focus

KW - DCT

KW - Focus-value

KW - Mobile phone

UR - https://www.scopus.com/pages/publications/56749096446

U2 - 10.1179/174313108X344470

DO - 10.1179/174313108X344470

M3 - Article

AN - SCOPUS:56749096446

SN - 1368-2199

VL - 56

SP - 301

EP - 306

JO - Imaging Science Journal

JF - Imaging Science Journal

IS - 6

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this