Selecting the Optimal Focus Measure for Autofocusing and Depth-From-Focus

—A method is described for selecting the optimal focus measure with respect to gray-level noise from a given set of focus measures in passive autofocusing and depth-from-focus applications. The method is based on two new metrics that have been defined for estimating the noise-sensitivity of different focus measures. The first metric—the Autofocusing Uncertainty Measure (AUM)—is useful in understanding the relation between gray-level noise and the resulting error in lens position for autofocusing. The second metric— Autofocusing Root-Mean-Square Error (ARMS error)—is an improved metric closely related to AUM. AUM and ARMS error metrics are based on a theoretical noise sensitivity analysis of focus measures, and they are related by a monotonic expression. The theoretical results are validated by actual and simulation experiments. For a given camera, the optimally accurate focus measure may change from one object to the other depending on their focused images. Therefore, selecti...

• Type: Journal
• Year: 1998
• Where: PAMI
• Authors: Muralidhara Subbarao, Jenn-Kwei Tyan
• Keywords: Focus Measures, Gray-level Noise, Optimal Focus Measure, PAMI 1998