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Limited By:	Subject = Cameras;

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Displaying Results 1 - 4 of 4 on page 1 of 1

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Precise radial un-distortion of images (2004)

Mallon, John; Whelan, Paul F.

Precise radial un-distortion of images (2004)

Mallon, John; Whelan, Paul F.

Abstract:

Radial image distortion is a frequently observed defect when using wide angle, low focal length lenses. In this paper a new method for its calibration and removal is presented. An inverse distortion model is derived that is accurate to a sub-pixel level, over a broad range of distortion levels. An iterative technique for estimating the models parameters from a single view is also detailed. Results on simulated and real images clearly indicate significantly improved performance compared to existing methods.

http://doras.dcu.ie/4641/

Marked Mark

Progress in Spectral-Spatial interferometry at multi-THz frequencies - Potential applications (2016)

Ade, P.A.R.; Hornsby, Amber; Pascale, Enzo; Sudiwala, R.; Juanola-Parramon, Roser; Bacc...

Progress in Spectral-Spatial interferometry at multi-THz frequencies - Potential applications (2016)

Ade, P.A.R.; Hornsby, Amber; Pascale, Enzo; Sudiwala, R.; Juanola-Parramon, Roser; Baccichet, Nicola; Savini, G.; Bracken, Colm; Donohoe, Anthony; Murphy, J.Anthony; O'Sullivan, Créidhe

Abstract:

Spectral-spatial interferometry pioneered in a narrow band in the near infrared has not enjoyed much exploitation as a technique. Proposed as a promising modulation method for a potential Far-infrared future satellite, a period of study was performed on two testbeds to improve and evolve this technique in the laboratory in order to simplify some of the technical aspects and the data analysis involved. Here we will present an update on the successful upgrade of a previous wideband millimetric (0.3-1.0 THz) testbed to a far-IR (11-14THz) one, as well as the ongoing progress on a broadband setup for an imaging system with a commercial thermal-or mid-IR (8 to 12 micron or 25-35 THz) camera currently working as imaging FTS. Source size, coherence and technical issues are discussed.

http://mural.maynoothuniversity.ie/13766/

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Quick sift(QSIFT), an approach to reduce SIFT computational cost (2018)

Fazel, Zahra; Famouri, Mahmoud; Nazemi, Azadeh; Azimifar, Zohreh

Quick sift(QSIFT), an approach to reduce SIFT computational cost (2018)

Fazel, Zahra; Famouri, Mahmoud; Nazemi, Azadeh; Azimifar, Zohreh

Abstract:

SIFT has been proven to be the most robust local rotation and illumination invariant feature descriptor. Being fully scale invariant is the most important advantage of this descriptor. The major drawback of SIFT is time complexity which prevents utilizing SIFT in real-time applications. This paper describes a method to increase the speed of SIFT feature extraction using keypoint estimation and approximation instead of keypoint calculation in various scales. This research attempts to decrease SIFT computational cost without sacrificing performance and propose quick SIFT method (QSIFT). The recent researches in this area have approved that direct feature value computation is more expensive than the value extrapolation. Consequently, the contribution of this research is to reduces the time execution without losing accuracy.

http://doras.dcu.ie/23502/

Marked Mark

Robust Real-Time Visual Odometry for Dense {RGB-D} Mapping (2011)

Whelan, Thomas; Johannsson, Hordur; Kaess, Michael; Leonard, John J.; McDonald, John

Robust Real-Time Visual Odometry for Dense {RGB-D} Mapping (2011)

Whelan, Thomas; Johannsson, Hordur; Kaess, Michael; Leonard, John J.; McDonald, John

Abstract:

This paper describes extensions to the Kintinuous [1] algorithm for spatially extended KinectFusion, incorporating the following additions: (i) the integration of multiple 6DOF camera odometry estimation methods for robust tracking; (ii) a novel GPU-based implementation of an existing dense RGB-D visual odometry algorithm; (iii) advanced fused realtime surface coloring. These extensions are validated with extensive experimental results, both quantitative and qualitative, demonstrating the ability to build dense fully colored models of spatially extended environments for robotics and virtual reality applications while remaining robust against scenes with challenging sets of geometric and visual features.

http://mural.maynoothuniversity.ie/6498/

Displaying Results 1 - 4 of 4 on page 1 of 1