|Title:||Applying information theory to image segmentation|
|Subject:||Image processing -- Digital techniques|
Hong Kong Polytechnic University -- Dissertations
Department of Electronic Engineering
|Pages:|| leaves : ill. ; 31 cm|
|Abstract:||Image segmentation is the process to separate an image into its constituent parts, or objects. There are many different segmentation algorithms but there is no consensus on what criterion is to be used to evaluate the performance of a particular segmentation algorithm. In this project, we shall make use of a new evaluation criterion, which is based on the information content of a segmented image, to evaluate the quality of a segmented image. We call this "Segmented Image Entropy" (SIE). A good segmented image should contain a large amount of information, and hence a large SIE. Similarly, we also measure the information content of the input gray scale image with a criterion called "Gray Scale Image Entropy" (GIE). With the use of SIE and GIE, the performance of different segmentation algorithms will be evaluated. Several common segmentation algorithms, namely Otsu's method, Maximum Entropy method, Minimum Error Thresholding, Minimum Cross Entropy method, Maximum Segmented Image Information Thresholding were evaluated and compared. According to a bi-Guassian p.d.f. model, 1400 gray scale images were generated with different combination in parameters, such as object size, mean and standard deviation of the object pixel gray-level values, mean and standard deviation of the background pixel gray-level values. Their segmented images were obtained by applying these chosen segmentation algorithms. Then, we calculated the GIE and SIE for each image. These 1400 (GIE, SIE) pairs are used in the comparison of the performance of different segmentation algorithms. Among these 1400 images, some are with good input quality but the segmentation results are not good. So, we can identity the weaknesses of a segmentation algorithm and improve it. For a particular segmentation algorithm called Maximum Segmented Image Information Thresholding MSII, improvements are incorporated and a new and better segmentation algorithm called "MSII version 2" has been proposed.|
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