TAILIEUCHUNG - Cơ sở dữ liệu hình ảnh P12

Pictures of water, grass, a bed of flowers, or a pattern on a fabric contain strong examples of image texture. Many natural and man-made objects are distinguished by their texture. Brodatz [1], in his introduction to Textures: A photographic album, states “The age of photography is likely to be an age of texture. | Image Databases Search and Retrieval of Digital Imagery Edited by Vittorio Castelli Lawrence D. Bergman Copyright 2002 John Wiley Sons Inc. ISBNs 0-471-32116-8 Hardback 0-471-22463-4 Electronic 12 Texture Features for Image Retrieval . MANJUNATH University of California at Santa Barbara Santa Barbara California WEI-YING MA Microsoft Research China Beijing China INTRODUCTION Pictures of water grass a bed of flowers or a pattern on a fabric contain strong examples of image texture. Many natural and man-made objects are distinguished by their texture. Brodatz 1 in his introduction to Textures A photographic album states The age of photography is likely to be an age of texture. His texture photographs which range from man-made textures woven aluminum wire brick walls handwoven rugs etc. to natural objects water clouds sand grass lizard skin etc. are being used as a standard data set for image-texture analysis. Such textured objects are difficult to describe in qualitative terms let alone creating quantitative descriptions required for machine analysis. The observed texture often depends on the lighting conditions viewing angles and distance may change over a period of time as in pictures of landscapes. Texture is a property of image regions as is evident from the examples. Texture has no universally accepted formal definition although it is easy to visualize what one means by texture. One can think of a texture as consisting of some basic primitives texels or Julesz s textons 2 3 also referred to as the micropatterns whose spatial distribution in the image creates the appearance of a texture. Most man-made objects have such easily identifiable texels. The spatial distribution of texels could be regular or periodic or random. In Figure brick is a micropattern in which particular distribution in a brick-wall image constitutes a structured pattern. The individual primitives need not be of the same size and shape as illustrated by the bricks and pebbles .

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