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texture segmentation with wavelet transform in matlab

Abstract

The present work deals with image segmentation which results in the subdivision of an image into its constituent regions or objects. The result of image segmentation is a set of segments that collectively cover the entire image or a set of contours extracted from the image. Each of the pixels in a region are similar with respect to some characteristic or computed property, such as color, intensity or texture. Specifically this project deals with texture segmentation of an image to find out the different types of textures present in the image.In this project different type of procedures have been followed to carry out texture segmentation. Procedures starting from fundamental filter transforms till multi-resolution technique using wavelet transform have been considered. Many texture-segmentation schemes are based on a filter-bank model, where the filters called Gabor filters are derived from Gabor elementary functions. Both linear and circular Gabor filters are studied and analyzed in this aspect and how these filters are better in comparison to linear filters is also analyzed. Different types of wavelet transform techniques like Haar transform, S transform, etc. are followed and their performance regarding texture segmentation is being studied.

Introduction

Image segmentation is an essential step in many advanced techniques of multi-dimensional signal processing and its applications. Texture analysis occupies an important place in many tasks such as scene classification, shape determination or image processing. This paper describes the technique of wavelet transform use for features extraction associated with individual image pixels and comparison of this method with application of the watershed transform technique. For the image decomposition and feature extraction the Haar transform has been applied as a basic tool used in the wavelet transform. A specific part of the paper is devoted to the mathematical analysis of Haar transform as a tool for image compression and image pixels features extraction using decomposition and reconstruction matrices. The method described is used for description of the whole system enabling perfect image reconstruction. The proposed algorithm of the Haar wavelet image decomposition includes image feature based segmentation and comparison of results with the watershed transform. Individual methods have been verified for simulated images and then applied for processing of selected magnetic resonance biomedical images. All methods were designed in the Matlab environment