Most auto-focusing algorhythms based on focus values which are calculated with high frequency image components are very sensitive to noise factor. The noise under low illumaination conditions generally degrades the auto-focusing performance. In this paper, we propose an operator to determine the noise insensitive focus value for digital imaging systems. The proposed algorhithm uses spatially adapted weights based on the local statistics of the image and the noise factors. Experiments conducted with and without noise factors demonstrate the high performance of the proposed method.
Bibliographical noteFunding Information:
1This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education, Science and Technology (2009-0079024) and supported in part by Samsung Techwin Center for the Next Generation Digital Imaging Research.
All Science Journal Classification (ASJC) codes
- Media Technology
- Electrical and Electronic Engineering