Results 21 to 30 of about 8,721,507 (209)
Efficient graph cut optimization for shape from focus [PDF]
Journal of Visual Communication and Image Representation, 2018 Abstract Shape From Focus refers to the inverse problem of recovering the depth in every point of a scene from a set of differently focused 2D images. Recently, some authors stated it in the variational framework and solved it by minimizing a non-convex functional.
Ribal, Christophe +2 more
openaire +2 more sources
Shape-from-focus for real-time terahertz 3D imaging
Optics Letters, 2019 Thanks to significant advances in real-time terahertz imaging in terms of resolution and image quality, adapting and extending optical methods for 3D imaging at the millimeter scale is now promising. The shape-from-focus algorithm is a post-processing tool used in optical microscopy to reconstruct the external shape surface of a convex surface object ...
J.-B. Perraud +5 more
openaire +5 more sources
Adaptive Weighted Guided Image Filtering for Depth Enhancement in Shape-From-Focus [PDF]
Pattern Recognition, 2022 Existing shape from focus (SFF) techniques cannot preserve depth edges and fine structural details from a sequence of multi-focus images. Moreover, noise in the sequence of multi-focus images affects the accuracy of the depth map.
Yuwen Li +3 more
semanticscholar +1 more source
A Small and High-Speed Driving Mechanism for 3D Shape Measurement in Monocular Endoscopy
Sensors, 2021 Three-dimensional (3D) shape acquisition has been widely introduced to enrich quantitative analysis with the combination of object shape and texture, for example, surface roughness evaluation in industry and gastrointestinal endoscopy in medicine.
Yoshikazu Nakajima +4 more
doaj +1 more source
3D Reconstruction of Gastrointestinal Regions Using Single-View Methods
IEEE Access, 2023 Capsule endoscopy is about to become an alternative to traditional colonoscopy. One uses a wireless camera to visualize the gastrointestinal (GI) tract. A 3D model based on image sequences obtained from wireless capsule endoscopy (WCE) can be helpful to ...
Bilal Ahmad +3 more
doaj +1 more source
3D reconstruction of gastrointestinal regions using shape-from-focus
International Conference on Machine Vision, 2023 3D shape reconstruction from images is an active topic in computer vision. Shape-from-Focus (SFF) is an important approach which requires image stack in a focus controlled manner to infer the 3D shape.
Bilal Ahmad, I. Farup, Pål Anders Floor
semanticscholar +1 more source
Improving Depth Computation From Robust Focus Approximation
IEEE Access, 2019 Shape-from-focus (SFF) technique is to recover three-dimensional shape of an object from a sequence of two-dimensional images of the same object taken by gradually changing the focus settings of the imaging device. In SFF, for each pixel location (i, j),
Seong-O Shim +4 more
doaj +1 more source
Assessing the outcome of orthognathic surgery by three-dimensional soft tissue analysis [PDF]
, 2018 Studies of orthognathic surgery often focus on pre-surgical versus post-surgical changes in facial shape. In contrast, this study provides an innovative comparison between post-surgical and control shape. Forty orthognathic surgery patients were included,
Ayoub, A. +4 more
core +2 more sources
Shape from Focus with Adaptive Focus Measure and High Order Derivatives [PDF]
Procedings of the British Machine Vision Conference 2015, 2015 Yuval Frommer +2 more
openaire +2 more sources
Investigation of Shape-from-Focus Precision by Texture Frequency Analysis
Electronics, 2021 This paper reports the precision of shape-from-focus (SFF) imaging according to the texture frequencies and window sizes of a focus measure. SFF is one of various depth measurement techniques for optical imaging, such as microscopy and endoscopy.
S. Onogi +3 more
semanticscholar +1 more source