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

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By A. Ravishankar Rao

A important factor in machine imaginative and prescient is the matter of sign to image transformation. in relation to texture, that's a major visible cue, this challenge has hitherto got little or no consciousness. This publication offers an answer to the sign to image transformation challenge for texture. The symbolic de- scription scheme includes a unique taxonomy for textures, and relies on acceptable mathematical versions 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 by means of statistical mea- sures, strongly ordered textures by way of the location of primitives, and weakly ordered textures via an orientation box. Compositional textures are made from those 3 periods of texture through the use of definite ideas of composition. The unifying subject of this booklet is to supply standardized symbolic descriptions that function a descriptive vocabulary for textures. The algorithms constructed within the publication were utilized to a wide selection of textured photographs bobbing up in semiconductor wafer inspection, circulation visualization and lumber processing. The taxonomy for texture can function a scheme for the identity and outline of floor flaws and defects taking place in quite a lot of useful applications.

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Extra info for A Taxonomy for Texture Description and Identification

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There are some textures such as the homespun woolen cloth, and the herringbone weave [19] which appear quite different at coarse and fine scales. We propose to extend our work in this direction in the future, where we will employ a bank of filters, tuned at different scales in order perform orientation estimation. One can then use measures based on the coherence of the output to determine the scales at 2. 13. (a) Analyzing the behaviour of the texture at varying scales. This figure shows the angle and coherence maps obtained by using a filter of window size 5 pixels to compute the gradient and a filter of window size 7 pixels to smooth the gradient vectors.

The segments capture the flow of the texture very well at each point, and orient themselves 2. Computing oriented texture fields 33 along the direction of flow. Hence the resulting pattern looks much like the original texture. 24) encoded as an image. The coherence at each point is quantized into one of 256 gray levels, and then displayed as an image. The angle vectors are then overlayed on the coherence image. The coherence image shows how orientation specificity varies over the original image - the brighter points indicating strong coherence of flow.

Thus each segment will give rise to a term of the form R;e 2i8j . If one sums these numbers, the resulting complex number has an orientation a, with respect to the x-axis, given by j=N L tana = R;sin20j j=l . :. 13. 13 indeed maximizes 8 2 . In order to show this, one must show that d2 8 2 /d0 2 is negative at 0 = O. 15) j=l If we show that the summed quantity is positive we are done. In order to do this, we must assume that the texture has only one dominant local orientation. In this case, the term R;cos(20j - 20) represents the projection of the squared vector onto the line oriented at 20.

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