Download e-book for iPad: Analysis of oriented texture with applications to the by Ayres F., et al.

By Ayres F., et al.

ISBN-10: 1608450295

ISBN-13: 9781608450299

The presence of orientated gains in pictures frequently conveys vital information regarding the scene or the gadgets contained; the research of orientated styles is a crucial job within the normal framework of photo figuring out. As in lots of different purposes of computing device imaginative and prescient, the final framework for the certainty of orientated positive factors in pictures might be divided into low- and high-level research. within the context of the learn of orientated positive factors, low-level research comprises the detection of orientated positive factors in photographs; a degree of the neighborhood significance and orientation of orientated positive aspects over the complete area of study within the photograph is termed the orientation box. High-level research pertains to the invention of styles within the orientation box, frequently by way of associating the constitution perceived within the orientation box with a geometric version. This booklet provides an research of numerous vital equipment for the detection of orientated positive aspects in photographs, and a dialogue of the part portrait strategy for high-level research of orientation fields. with a view to illustrate the innovations built through the publication, an software is gifted of the part portrait way to computer-aided detection of architectural distortion in mammograms. desk of Contents: Detection of orientated good points in pictures / research of orientated styles utilizing section photographs / Optimization options / Detection of websites of Architectural Distortion in Mammograms

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Extra resources for Analysis of oriented texture with applications to the detection of architectural

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1). 67 pixels). 06 pixels). 38 pixels). 90 pixels). (g) Line operator (λ = 8 pixels). All images are of size 4096 × 512 pixels. Reproduced with permission from F. J. Ayres and R. M. Rangayyan. “Design and performance analysis of oriented feature detectors”. Journal of Electronic Imaging, 16(2):12 pages, April 2007. article number 023007. 4. DISCUSSION 23 by the steerable filter, the quadrature steerable filter, the real Gabor filter, and the complex Gabor filter. 8a. 20 GHz Pentium 4 processor, 2 MB of cache, and 2 GB of RAM).

9. It is observed that all of the oriented feature detectors studied present a reduction in AU C with increasing noise, as expected. The real Gabor filter is the most robust to 24 1. 9. This result can be explained in terms of the spatial extent of the filters investigated: the main lobe of the real Gabor filter has a larger length-to-width ratio than that of the other filters, thus enhancing more effectively the signal-to-noise ratio after filtering. 1 in the test image; conversion of the optimal scale range to millimeters is also given for easier comparison of the oriented feature detectors.

As a consequence, it is possible to iterate the algorithm in a practical situation without excessive computational burden. At each iteration, it is expected that the algorithm will result in an improved estimate of the true parameters of the phase portrait model. However, due to the fact that the algorithm requires a correction factor that is inversely proportional to the magnitude of v(x, y), numerical instabilities are possible. Hence, the algorithm is limited to a fixed number of iterations.

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Analysis of oriented texture with applications to the detection of architectural by Ayres F., et al.

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