A. Ravishankar Rao's A Taxonomy for Texture Description and Identification PDF

By A. Ravishankar Rao

ISBN-10: 1461397774

ISBN-13: 9781461397779

ISBN-10: 1461397790

ISBN-13: 9781461397793

A principal factor in laptop imaginative and prescient is the matter of sign to image transformation. with regards to texture, that is a huge visible cue, this challenge has hitherto obtained little or no recognition. This publication provides an answer to the sign to image transformation challenge for texture. The symbolic de- scription scheme includes a singular taxonomy for textures, and relies on applicable mathematical types for other kinds of texture. The taxonomy classifies textures into the vast sessions of disordered, strongly ordered, weakly ordered and compositional. Disordered textures are defined via statistical mea- sures, strongly ordered textures through the location of primitives, and weakly ordered textures via an orientation box. Compositional textures are made out of those 3 sessions of texture by utilizing convinced principles of composition. The unifying topic of this publication is to supply standardized symbolic descriptions that function a descriptive vocabulary for textures. The algorithms constructed within the e-book were utilized to a wide selection of textured photos bobbing up in semiconductor wafer inspection, movement visualization and lumber processing. The taxonomy for texture can function a scheme for the id and outline of floor flaws and defects happening in quite a lot of functional applications.

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2 Background The objective of this chapter is to obtain an orientation field from a given texture. Based on the philosophy of Barrow and Tenenbaum [8], the orientation field may be viewed as an intrinsic image, and represents the first computational stage in analyzing oriented textures. The orientation field is computed using domain-independent processing, and constitutes a more abstract description of the image than raw intensity values. In the final section, we show how predicates defined on the intrinsic image give rise to meaningful results in appropriate domains.

If the orientation of the line is (), then the filter is the derivative of the Gaussian in the direction of (); in other words, the normal derivative: :: = 'Vg. (cos(),sin()). 7) The orientation of the filter is adjusted to achieve the maximum response for the underlying visual texture. In implementation, the orientation of the maximum response is determined by first computing the gradient after smoothing with a Gaussian filter, and then processing the gradient vector field as follows. The orientation of the gradient is the direction of maximum response to within a sign reversal.

It is only when these parameters are varied significantly that different responses could result, as shown in the next section. If one knows a priori the sizes of features in the texture pattern, then this knowledge can be used to estimate both the values of 0"1 and 0"2 needed. Normally one would use widely spaced 0"' s, as indicated in the edge detection theories of Marr and Hildreth [85] or Canny [21]. 5(a) shows a 240x240 image of secondary streaming induced by an oscillating cylinder [l18, p.

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A Taxonomy for Texture Description and Identification by A. Ravishankar Rao

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