Title :
Low-power auto focus algorithm using modified DCT for the mobile phones
Author :
Lee, S.Y. ; Park, S.S. ; Kim, C.S. ; Kumar, Y. ; Kim, S.W.
Author_Institution :
Dept. of Electron. Eng., Korea Univ., Seoul, South Korea
Abstract :
A new focus value calculation method based on the middle frequency component of DCT and applicable in auto focus function of a mobile phone is presented. Experimental results confirm the exactness in focus value calculation, power efficiency and immunity to impulsive noises of the proposed method.
Keywords :
cameras; digital photography; discrete cosine transforms; impulse noise; mobile handsets; optical focusing; focus value calculation method; impulsive noises; low-power autofocus algorithm; middle frequency component; mobile phone cameras; modified discrete cosine transform; power efficiency; Digital cameras; Discrete cosine transforms; Discrete wavelet transforms; Filters; Focusing; Frequency; Hardware design languages; Laplace equations; Lenses; Mobile handsets;
Conference_Titel :
Consumer Electronics, 2006. ICCE '06. 2006 Digest of Technical Papers. International Conference on
Print_ISBN :
0-7803-9459-3
DOI :
10.1109/ICCE.2006.1598313
