Results 161 to 170 of about 562,132 (184)

Real-time processing for shape-from-focus techniques

Journal of Real-Time Image Processing, 2013
An increase in the number of frames and computational complexity of the focus measure causes the shape-from-focus (SFF) method to become time consuming and occupy a lot of memory. As such, these factors become a limitation for using SFF techniques in real-time applications.
Jawad Humayun, Aamir Saeed Malik
openaire   +1 more source

3D Shape from Focus Using LULU Operators

2012
Extracting the shape of an object is one of the important tasks to be performed in many vision applications. One of the difficult challenges in 3D shape extraction is the roughness of the surfaces of objects. Shape from focus (SFF) is a shape recovery method that reconstructs the shape of an object from a sequence of images taken from the same ...
Roushanak Rahmat, Aamir Saeed Mallik, Nidla Kamel, Tae-Sun Choi, Monson H. Hayes   +4 more
openaire   +1 more source

Calculating Accurate Window Size for Shape-From-Focus

2014 International Conference on Information Science & Applications (ICISA), 2014
Shape from focus (SFF), represents a passive technique in recovering object shapes from scenes. In SFF systems, a single imaging device is used to acquire images followed by the application of Focus Measure (FM) at every point to obtain focus quality, to obtain depth by maximizing the focus curves.
Mannan Saeed Muhammad, Husna Mutahira, Kun-Woo Choi, Whoi-Yul Kim, Yasar Ayaz   +4 more
openaire   +1 more source

Estimating shape from focus by Gaussian process regression

2012 IEEE International Conference on Systems, Man, and Cybernetics (SMC), 2012
Mostly, shape from focus (SFF) methods utilize initial depth estimate to obtain 3D shape of an object. However, accuracy of these methods is limited due to erroneous initial focus and depth measurements. In this paper, we introduce a Gaussian process regression based approach, which estimates 3D shape of the object from the noisy initial depth values ...
Muhammad Tariq Mahmood, Young-Kyu Choi, Seong-O Shim   +2 more
openaire   +1 more source

Shape from Focus using Color Segmentation and Bilateral Filter

2006 IEEE 12th Digital Signal Processing Workshop & 4th IEEE Signal Processing Education Workshop, 2006
In this paper, we describe a new method for shape from focus using a set of the color segmentation and the bilateral filtering. The shape from focus estimates the geometrical shape of objects from the defocus level of images taken with different focal state. However, the conventional methods tend to fail in the shape estimation around the edge parts of
H. Shoji, K. Shirai, M. Ikehara
openaire   +1 more source

Fast Shape-From-Focus method for 3D object reconstruction

Optik, 2018
Abstract Shape-From-Focus method (SFF method) is a method for recovering depth from an image series which are taken with different focus settings. For method presented in this paper, the series must be taken with an optical device (optical microscope, CCD or classic camera) with very small depth of focus, different images must be focussed to ...
openaire   +1 more source

DCT and PCA Based Method for Shape from Focus

2008
Discrete Cosine Transform (DCT) and Principal Component Analysis (PCA) are widely used in computer vision applications. In this paper, we introduce a new SFF method based on DCT and PCA. Contrary to computing focus quality locally by summing all values in a 2D or 3D window obtained after applying a focus measure, a vector consisting of seven ...
M. Tariq Mahmood, Wook-Jin Choi, Tae-Sun Choi   +2 more
openaire   +1 more source

Shape from Focus and Defocus

2020
Tae Hyun Kim, Kyoung Mu Lee
openaire   +1 more source

Energy minimization for image focus volume in shape from focus

Pattern Recognition, 2022
Usman Ali
exaly  

Enforcing spatially coherent structures in shape from focus

Multimedia Tools and Applications, 2023
Usman Ali, Muhammad Tariq Mahmood
openaire   +1 more source