Noise Insensitive Focus Value Operator for Digital Imaging Systems

作者：Choi Jongseong^*; Kang Hee; Lee Chang Min; Kang Moon Gi

来源：IEEE Transactions on Consumer Electronics, 2010, 56(2): 312-316.

DOI：10.1109/TCE.2010.5505933

• Auto-focusing
• Focus value
• Gaussian noise
• Local statistics

Most auto-focusing algorithms based on focus values which are calculated with high frequency image components are very sensitive to noise factor. The noise under low illumination 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 algorithm determines the sharpness of a given image without the influence of noise factors. The algorithm uses spatially adaptive 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. (1)

• 出版日期2010-5