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Robust Focus Volume Regularization in Shape From Focus
IEEE Transactions on Image Processing, 2021Shape from focus (SFF) reconstructs 3D shape of the scene from a sequence of multi-focus images, and the quality of reconstructed shape mainly depends on the accuracy of image focus volume (FV). Traditional SFF techniques exhibit poor performance in preserving structural edges and fine details while removing noisy artifacts, and mostly they do not ...
Usman Ali, Muhammad Tariq Mahmood
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Analysis of focus measure operators for shape-from-focus
Pattern Recognition, 2013Shape-from-focus (SFF) has widely been studied in computer vision as a passive depth recovery and 3D reconstruction method. One of the main stages in SFF is the computation of the focus level for every pixel of an image by means of a focus measure operator.
Said Pertuz +2 more
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Underwater Microscopic Shape from Focus
2014 22nd International Conference on Pattern Recognition, 2014In this paper, we extend traditional Shape from focus (SFF) to the underwater scenario. Specifically, we show how 3D shape of objects immersed in water can be extracted from images captured under an optical microscope. Traditional SFF employs telecentric optics to achieve geometric registration among the frames. We extend conventional SFF to underwater
S. Karthik, A.N. Rajagopalan
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Shape from focus for large image fields
Applied Optics, 2015Shape from focus is a method for the accurate measurement of the geometrical shape of objects. The measurement principle is the local focus search. The method is suitable only for objects with a texture (optically rough surface). The longitudinal coordinate of a surface point is determined from the maximum of the focus measure function.
Pavel, Pavliček, Ivana, Hamarová
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Shape from focus using gradient of focus measure curve
Optics and Lasers in Engineering, 2023Boya Fu +5 more
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Energy minimization for image focus volume in shape from focus
Pattern Recognition, 2022Usman Ali, Muhammad Tariq Mahmood
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Guided image filtering in shape-from-focus: A comparative analysis
Pattern Recognition, 2021Mostly, shape from focus (SFF) methods do not consider any prior to extend the accuracy of the depth map. Ultimately, even the improved depth map might lack the accurate structure of the object.
Usman Ali, I. Lee, M. Mahmood
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