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초록
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.
키워드
auto-focus; focus-value; DCT; mobile phone
- 제목
- Low-power passive focus measure operator based on the DCT for mobile phones
- 저자
- Lee, S. Y.; Kumar, Y.; Cho, J. M.; Kim, S. W.
- 발행일
- 2008-12
- 유형
- Article
- 권
- 56
- 호
- 6
- 페이지
- 301 ~ 306