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Automatic Thresholding Techniques for Optical Images

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Author(s): Moumena Al-Bayati | Ali El-Zaart

Journal: Signal & Image Processing
ISSN 2229-3922

Volume: 04;
Issue: 03;
Start page: 1;
Date: 2013;
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Keywords: Segmentation | Thresholding | Otsu Method | Valley Emphasis Method | Neighborhood Valley Emphasis Method | Variance and Intensity Contrast Method | & Variance Discrepancy Method.

ABSTRACT
Image segmentation is one of the important tasks in computer vision and image processing. Thresholding isa simple but most effective technique in segmentation. It based on classify image pixels into object andbackground depended on the relation between the gray level value of the pixels and the threshold. Otsutechnique is a robust and fast thresholding techniques for most real world images with regard to uniformityand shape measures. Otsu technique splits the object from the background by increasing the separabilityfactor between the classes. Our aim form this work is (1) making a comparison among five thresholdingtechniques (Otsu technique, valley emphasis technique, neighborhood valley emphasis technique, varianceand intensity contrast technique, and variance discrepancy technique)on different applications. (2)determining the best thresholding technique that extracted the object from the background. Ourexperimental results ensure that every thresholding technique has shown a superior level of performanceon specific type of bimodal images.
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