Results 241 to 250 of about 14,804 (296)

Dequantizing image orientation

IEEE Transactions on Image Processing, 2002
We address the problem of computing a local orientation map in a digital image. We show that standard image gray level quantization causes a strong bias in the repartition of orientations, hindering any accurate geometric analysis of the image. In continuation, a simple dequantization algorithm is proposed, which maintains all of the image information ...
Desolneux, Agnès   +3 more
openaire   +2 more sources

Automatic image orientation detection

IEEE Transactions on Image Processing, 2002
We present an algorithm for automatic image orientation estimation using a Bayesian learning framework. We demonstrate that a small codebook (the optimal size of codebook is selected using a modified MDL criterion) extracted from a learning vector quantizer (LVQ) can be used to estimate the class-conditional densities of the observed features needed ...
Aditya Vailaya   +4 more
openaire   +2 more sources

Stable estimation of image orientation

Proceedings of 1st International Conference on Image Processing, 2002
We examine the performance of phase-based and energy-based techniques for estimating image orientation, emphasizing measurement stability under deformations that commonly occur in natural images. We also present a new energy-based technique for estimating multiple orientations in a neighbourhood and for reliably extracting multiple orientations from ...
Leif Haglund, David J. Fleet
openaire   +1 more source

Automatic image orientation detection

Proceedings 1999 International Conference on Image Processing (Cat. 99CH36348), 1999
We present an algorithm for automatic image orientation estimation using a Bayesian learning framework. We demonstrate that a small codebook (the optimal size of codebook is selected using a modified MDL criterion) extracted from a vector quantizer can be used to estimate the class-conditional densities of the observed features needed for the Bayesian ...
Aditya Vailaya   +2 more
openaire   +1 more source

An image oriented CAD approach

1996
Matching abstract CAD models with images is a well studied problem. It includes the problems of identifying modelled objects for which 3D CAD data is available in images, and of locating them with respect to a given reference frame. Some authors have concluded that this problem has no real general solution as the representation levels are too different
Schmid, Cordelia   +3 more
openaire   +2 more sources

Imaging of Oriented Molecules

The Journal of Physical Chemistry A, 1997
Hexapole state selection and orientation of parent molecules is combined with two-dimensional ion imaging of photofragments to study the direct photolysis of deuterated methyl iodide molecules (CD3I) at 266 nm. The combination of these two techniques allows us to create an essentially single quantum state-selected beam of oriented molecules, which are ...
Janssen, M.H.M.   +2 more
openaire   +2 more sources

An image-oriented database system

1980
This paper describes the concepts and facilities of interactive database system named ADM (Aggregate Data Manager), which facilitates the unified handling of image data and conventional coded data.
Yoichi Takao, Shoji Itoh, Joji Iisaka
openaire   +1 more source

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