Dipartimento d'Ingegneria

Research

Research (19)

Monday, 05 May 2014 11:48

IMVIP 2014

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The Irish Machine Vision and Image Processing conference (IMVIP 2014) will be hosted by the Intelligent Systems Research Centre (ISRC) at the University of Ulster, Magee from 27th-29th August 2014. IMVIP 2014 is the main conference of the Irish Pattern Recognition and Classification Society. The conference emphasises both theoretical research results and practical engineering experience in all areas of machine vision and image processing. Call for papers and additional information can be found at https://sites.google.com/site/imvip2014/. Please note that the deadline for submissions has been extended to Wednesday 14th May 2014.
Friday, 02 May 2014 17:30

Texture databases for benchmarking

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Texture analysis is an area of intense research activity. Like in other fields, the availability of public data for benchmarking is vital to the development of the discipline. In ‘‘Texture databases – A comprehensive survey’’, Hossain and Serikawa recently provided a precious review of a good number of texture datasets. We have recently proposed an appendix to complement the cited work by providing reference to additional image databases of bio-medical textures, textures of materials and natural textures that have been recently employed in experiments with texture analysis.

Source:
F Bianconi and A. Fernández, An appendix to ‘‘Texture databases – A comprehensive survey’’, Pattern Recognition Letters, 45(1):33-38,2014
Stereo pair images from very high-resolution optical satellites GeoEye-1 (GE1) and WorldView-2 (WV2) can be succesfully used for land cover classification agricultural areas through object-based image analysis. The overall accuracy attained by applying nearest neighbor and support vector machine classifiers to the four multispectral bands of GE1 were very similar to those computed from WV2, for either four or eight multispectral bands. Height data, in the form of nDSM, proved to be the most important feature for greenhouse classification. We obtained overall accuracy close to 90%.

Source:
M.Á. Aguilar, F. Bianconi, F.J. Aguilar and I. Fernández, "Object-Based Greenhouse Classification from GeoEye-1 and WorldView-2 Stereo Imagery", Remote Sensing, 6(5):3554-3582, 2014
Wednesday, 05 March 2014 10:43

Colour descriptors for parquet sorting

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We have experimentally investigated and compared the performance of various colour descriptors (i.e.: soft descriptors, percentiles, marginal histograms and 3D histogram), and colour spaces (i.e.: RGB, HSV and CIE Lab) for parquet sorting. The results show that simple and compact colour descriptors, such as the mean of each colour channel, are as accurate as more complicated features. Likewise, we found no statistically significant difference in the accuracy attainable through the colour spaces considered in the paper. Our experiments also show that most methods are fast enough for real-time processing. The results suggest the use of simple statistical descriptors along with RGB data as the best practice to approach the problem.

OAK 04 
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Source:
F. Bianconi, A. Fernández, E. González and S.A. Saetta, "Performance analysis of colour descriptors for parquet sorting", Expert Systems With Applications, 40(5):1636-1644, 2013


We studied a sequential, two-step procedure based on machine vision for detecting and characterizing impurities in paper. The method is based on a preliminary classification step to differentiate defective paper patches (i.e.: with impurities) from non-defective ones (i.e.: with no impurities), followed by a thresholding step to separate the impurities from the background. This approach permits to avoid the artifacts that occurs when thresholding is applied to paper samples that contain no impurities. We discuss and compare different solutions and methods to implement the procedure and experimentally validate it on a datasets of 11 paper classes. The results show that a marked increase in detection accuracy can be obtained with the two-step procedure in comparison with thresholding alone.

ImagingSystem
Source:
F. Bianconi, L. Ceccarelli, A. Fernández and S. A. Saetta, "A sequential machine vision procedure for assessing paper impurities", Computers in Industry, 65(2):325-332, 2014
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