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Full-Text Articles in Engineering
Fast And Accurate Autofocus Control Using Guassian Standard Deviation And Gradient-Based Binning, Peter Dimeo, Lu Sun, Xian Du
Fast And Accurate Autofocus Control Using Guassian Standard Deviation And Gradient-Based Binning, Peter Dimeo, Lu Sun, Xian Du
Mechanical and Industrial Engineering Faculty Publication Series
We propose a fast and accurate autofbcus algorithm using Gaussian standard deviation and gradient-based binning. Rather than iteratively searching for the optimal focus using an optimization process, the proposed algorithm directly calculates the mean of the Gaussian shaped focus measure (FM) curve to find the optimal focus location and uses the FM curve standard deviation to adapt the motion step size. The calculation only requires 3-4 defocused images to identify the center location of the FM curve. Furthermore, by assigning motion step sizes based on the FM curve standard deviation, the magnitude of the motion step is adaptively controlled according …
Multi-Scale Visualization Of Molecular Architecture Using Real-Time Ambient Occlusion In Sculptor, Manuel Wahle, Willy Wriggers
Multi-Scale Visualization Of Molecular Architecture Using Real-Time Ambient Occlusion In Sculptor, Manuel Wahle, Willy Wriggers
Mechanical & Aerospace Engineering Faculty Publications
The modeling of large biomolecular assemblies relies on an efficient rendering of their hierarchical architecture across a wide range of spatial level of detail. We describe a paradigm shift currently under way in computer graphics towards the use of more realistic global illumination models, and we apply the so-called ambient occlusion approach to our opensource multi-scale modeling program, Sculptor. While there are many other higher quality global illumination approaches going all the way up to full GPU-accelerated ray tracing, they do not provide size-specificity of the features they shade. Ambient occlusion is an aspect of global lighting that offers great …