Focus measure based on the energy of high-frequency components in the S transform.
Focus measure plays a fundamental role in the shape from focus technique. In this Letter, we suggest a focus measure in the S-transform domain that is based on the energy of high-frequency components. A localized spectrum by using variable window size provides a more accurate method of measuring image sharpness as compared to other focus measures proposed in spectral domains. An optimal focus measure is obtained by selecting an appropriate frequency-dependent window width. The performance of the proposed focus measure is compared with those of existing focus measures in terms of three-dimensional shape recovery. Experimental results demonstrate the effectiveness of the proposed focus measure.
Mahmood
Muhammad Tariq
MT
School of Information and Mechatronics, Gwangju Institute of Science and Technology, 261 Cheomdan Gwagiro,Buk-Gu, Gwangju 500-712, Korea.
Choi
Tae-Sun
TS