Date of Submission

11-28-1994

Date of Award

11-28-1995

Institute Name (Publisher)

Indian Statistical Institute

Document Type

Doctoral Thesis

Degree Name

Doctor of Philosophy

Subject Name

Computer Science

Department

Computer Vision and Pattern Recognition Unit (CVPR-Kolkata)

Supervisor

Chaudhuri, Bidyut Baran (CVPR-Kolkata; ISI)

Abstract (Summary of the Work)

Visual textureTexture is a property to characterize a region of a scene. A set of natural texture images is shown in Fig. 1.1. A specific texture may be generated due to certain organization of several objects in a region, or due to the reflectance pattern caused by color variation or unevenness of an object surface. Since texture provides a lot of information of a region, texture analysis and synthesis are important components of digital image processing.It is difficult to provide a formal definition of texture although we perceive and recognize texture rather easily. According to Sklansky [152) "A region in an image has a constant texture if a set of local statistics or other local properties of the picture functions are constant, slowly varying, or approximately periodic" Haralick et al. [59] stated" Texture is an innate property of virtually all surfaces. It contains important information about the structural arrangement of surfaces and their relationship to the surrounding environment. For textured regions we may get different interpretations at different distances and at different degrees of visual attention. At standard distance with normal attention, a notion of macro- regularity is obtained that is characteristic of the particular texture. Even ho-mogeneous regions and edges, when viewed closely and attentively are sometimes found to constitute of meaningful objects. For tonal regions, on the other hand, the interpretations remain largely unaffected with the distance and degree of at- tention. Moreover, tonal regions have edges at the 'borders' of the regions, while edges are normally abundant in the 'interior' of a textured region.Early researchers characterized a textured pattern as one exhibiting many repetitive variations of similar &'basic elements' each of which is small relative to the size of the textured region; or as large number of elements, each to some degree visible, and, on the whole, densely and evenly placed over the field of view. The 'basic elements' which are supposed to be the main constituent of texture is called 'texture elements' or texels.Properties of texture : Surface texture is a combination of 2-D and 3-D properties of the objects in a scene. In general, image texture possesses qualities like uniformity, density, coarseness, roughness, regularity, linearity, directionality, repetition frequency, and phase. These qualities play important roles in describing a texture. Some of these qualities are often interrelated. From the quantitative point of view, six basic textural properties proposed by Tamura et al. [156) are described below.

Comments

ProQuest Collection ID: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqm&rft_dat=xri:pqdiss:28842884

Control Number

ISILib-TH253

Creative Commons License

Creative Commons Attribution 4.0 International License
This work is licensed under a Creative Commons Attribution 4.0 International License.

DOI

http://dspace.isical.ac.in:8080/jspui/handle/10263/2146

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