نتایج جستجو برای: 3d hough transform

تعداد نتایج: 300100  

1991
M. Mirmehdi G. A. W. West G. R. Dowling

A variation on the Hough transform, the special normal/angle Hough transform , (RsHT) is described detailing its characteristics and advantages and suitablity for a parallel implementation. The transputer is introduced and the application of the RsHT on two popular types of transputer networks, a control-driven array and a demand-driven farm of transputers is described. The methods employed for...

2011
Markus Brunk Heike Ruppertshofen Sarah Schmidt Peter Beyerlein Hauke Schramm

We present an approach for automatic bone age classification from hand x-ray images using the Discriminative Generalized Hough Transform (DGHT). To this end, a region, characteristic for the bone age (e.g. an epiphyseal plate), is localized and subsequently classified to determine the corresponding age. Both steps are realized using the DGHT, whereat the difference of the approaches lies within...

1990
Hiroyasu Koshimizu Munetoshi Numada

FIHT2 algorithm defined by p = x . cos 0 + y .sin 0 + (a/(21()) . x . s ine at 0 5 6 < a / 2 and at p = x . cose + y . sin 0 + (aJ(2It')) . y . cos 0 at a / 2 5 0 < a is a Hough transform which requires nothing of the trigonometric and functional operations to generate the Hough distributions. It is demonstrated in this paper that the FIHT2 is a complete alternative of the usual Hough transform...

Journal: :Real-Time Imaging 2000
Cheyne Gaw Ho Rupert C. D. Young Chris D. Bradfield Chris R. Chatwin

T he Hough transform is a useful technique in the detection of straight lines and curves in an image. Due to the mathematical similarity of the Hough transform and the forward Radon transform, the Hough transform can be computed using the Radon transform which, in turn, can be evaluated using the central slice theorem. This involves a two-dimensional Fourier transform, an x-y to rmapping and a ...

1996
Heikki Kälviäinen Panagiota Bosdogianni Maria Petrou Josef Kittler

In this paper we propose the use of the Randomized Hough Transform algorithm for the determination of the proportions of pure classes present in sets of mixed pixels, for large datasets (for which the deterministic Hough is prohibitively slow) and in the presence of outliers (ie in cases that the classical Least Square Error method cannot cope). We demonstrate our results both with simulated an...

2016
Thomas Blaffert Cristian Lorenz Hannes Nickisch Jochen Peters Jürgen Weese

This paper addresses the localization of anatomical structures in medical images by a Generalized Hough Transform (GHT). As localization is often a pre-requisite for subsequent model-based segmentation, it is important to assess whether or not the GHT was able to locate the desired object. The GHT by its construction does not make this distinction. We present an approach to detect incorrect GHT...

1995
Anthony Ashbrook Neil A. Thacker Peter I. Rockett C. I. Brown

The recognition of shapes in images using Pairwise Geometric Histograms has previously been confined to fixed scale shape. Although the geometric representation used in this algorithm is not scale invariant, the stable behaviour of the similarity metric as shapes are scaled enables the method to be extended to the recognition of shapes over a range of scale. In this paper the necessary addition...

2010
Heike Ruppertshofen Cristian Lorenz Peter Beyerlein Zein Salah Georg Rose Hauke Schramm

An approach for automatic object localization in medical images utilizing an extended version of the generalized Hough transform (GHT) is presented. In our approach the shape model in the GHT is equipped with specific model point weights, which are used in the voting process. The weights are adjusted in a discriminative training procedure, which aims at a minimal localization error of the GHT. ...

Journal: :The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences 2015

2009
Jae Byung Park Seung Hun Lee Il Jae Lee

In this study, we propose a precise 3D lug pose detection sensor for automatic robot welding of a lug to a huge steel plate used in shipbuilding, where the lug is a handle to carry the huge steel plate. The proposed sensor consists of a camera and four laser line diodes, and its design parameters are determined by analyzing its detectable range and resolution. For the lug pose acquisition, four...

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