Results 41 to 50 of about 562,132 (184)

Efficient estimation of smoothing spline with exact shape constraints

Statistical Theory and Related Fields, 2021
Smoothing spline is a popular method in non-parametric function estimation. For the analysis of data from real applications, specific shapes on the estimated function are often required to ensure the estimated function undeviating from the domain ...
Vincent Chan, Kam-Wah Tsui, Yanran Wei, Zhiyang Zhang, Xinwei Deng   +4 more
doaj   +1 more source

Image Quality Assessment for Performance Evaluation of Focus Measure Operators [PDF]

Mehran University Research Journal of Engineering and Technology, 2015
This paper presents the performance evaluation of eight focus measure operators namely Image CURV (Curvature), GRAE (Gradient Energy), HISE (Histogram Entropy), LAPM (Modified Laplacian), LAPV (Variance of Laplacian), LAPD (Diagonal Laplacian), LAP3 ...
Farida Memon, Mukhtiar Ali Unar, Sheeraz Memon   +2 more
doaj  

Shape-Memory Polymeric Artificial Muscles: Mechanisms, Applications and Challenges

Molecules, 2020
Shape-memory materials are smart materials that can remember an original shape and return to their unique state from a deformed secondary shape in the presence of an appropriate stimulus.
Yujie Chen, Chi Chen, Hafeez Ur Rehman, Xu Zheng, Hua Li, Hezhou Liu, Mikael S. Hedenqvist   +6 more
doaj   +1 more source

Using a low pass filter to recover three-dimensional shape from focus in the presence of noise [PDF]

, 2012
Korean GovernmentSeveral passive methods like Shape from Focus (SFF) have been proposed for recovering 3-D shape of the objects from their 2-D images. Presence of noise in the images affects the accuracy of shape recovery. Most of the existing approaches
Mannan Saeed Muhammad
core  

A three-dimensional imaging system for surface profilometry of moving objects [PDF]

, 2013
Non-contact optical imaging system design and the corresponding surface profilometry algorithm are critical components in various metrology applications, such as surface inspection of semiconductor components on the production line.
Deng, F, Deng, J, Fung, KSM, Lam, EY, Liu, J   +4 more
core   +1 more source

Shape From Focus Based on Depth Estimation Confidence [PDF]

Jisuanji gongcheng
Shape From Focus (SFF) is an important technique in the field of non-contact 3D reconstruction. Owing to the influence of the environment and the limitations of the camera, the image acquisition process inevitably generates noise, which affects the ...
Yanqiong SHI, Zhao ZHA, Wenliang ZHANG, Eryu DAI, Zhong CHEN
doaj   +1 more source

A Novel Multi-Focus Image Fusion Network with U-Shape Structure

Sensors, 2020
Multi-focus image fusion has become a very practical image processing task. It uses multiple images focused on various depth planes to create an all-in-focus image.
Tao Pan, Jiaqin Jiang, Jian Yao, Bin Wang, Bin Tan   +4 more
doaj   +1 more source

Deep Depth From Focus

, 2018
Depth from focus (DFF) is one of the classical ill-posed inverse problems in computer vision. Most approaches recover the depth at each pixel based on the focal setting which exhibits maximal sharpness. Yet, it is not obvious how to reliably estimate the
A Thelen, C Hazirbas, E Adelson, F Liu, J Park, K Honauer, M Mahmood, M Moeller, O Russakovsky, R Garg, S Pertuz, V Badrinarayanan, Y Bok   +12 more
core   +1 more source

Uniaxial three-dimensional shape measurement with projector defocusing [PDF]

, 2012
Our study shows that the phase error caused by improperly defocused binary structured patterns correlates to the depth z. This finding leads to a novel uniaxial three-dimensional shape measurement technique without triangulation.
Xu, Ying, Zhang, Song
core   +4 more sources

Focus Estimation Methods for Use in Industrial SFF Imaging Systems

Applied Sciences
A Shape-From-Focus (SFF) is a three-dimensional imaging method based on focus information. It is not yet widely used for in-line industrial inspection or measurement tasks.
Andrzej Sioma, Bartosz Lenty
doaj   +1 more source