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Low-power passive focus measure operator based on the DCT for mobile phones
- Authors
- Lee, S. Y.; Kumar, Y.; Cho, J. M.; Kim, S. W.
- Issue Date
- 12월-2008
- Publisher
- TAYLOR & FRANCIS LTD
- Keywords
- auto-focus; focus-value; DCT; mobile phone
- Citation
- IMAGING SCIENCE JOURNAL, v.56, no.6, pp.301 - 306
- Indexed
- SCIE
SCOPUS
- Journal Title
- IMAGING SCIENCE JOURNAL
- Volume
- 56
- Number
- 6
- Start Page
- 301
- End Page
- 306
- ISSN
- 1368-2199
- 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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