TAILIEUCHUNG - Biosignal and Biomedical Image Processing phần 10

Tham khảo tài liệu 'biosignal and biomedical image processing phần 10', kỹ thuật - công nghệ, kĩ thuật viễn thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 362 Chapter 12 Figure Isolated portions of the cells shown in Figure . The upper images were created by thresholding the intensity. The lower left image is a combination logical OR of the upper images and the lower right image adds a thresholded texture-based image. The original and texture images are shown in Figure . Note that the texture image has been scaled up first by a factor of six then by an additional factor of two to bring it within a nominal image range. The intensity thresh-olded images are shown in Figure upper images the upper right image has been inverted . These images are combined in the lower left image. The lower right image shows the combination of both intensity-based images with the thresholded texture image. This method of combining images can be extended to any number of different segmentation approaches. MORPHOLOGICAL OPERATIONS Morphological operations have to do with processing shapes. In this sense they are continuity-based techniques but in some applications they also operate on Copyright Marcel Dekker Inc. All rights reserved. Marcel Dekker Inc. 270 Madison Avenue New York New York 10016 TLFeBOOK Image Segmentation 363 edges making them useful in edge-based approaches as well. In fact morphological operations have many image processing applications in addition to segmentation and they are well represented and supported in the MATLAB Image Processing Toolbox. The two most common morphological operations are dilation and erosion. In dilation the rich get richer and in erosion the poor get poorer. Specifically in dilation the center or active pixel is set to the maximum of its neighbors and in erosion it is set to the minimum of its neighbors. Since these operations are often performed on binary images dilation tends to expand edges borders or regions while erosion tends to decrease or even eliminate small regions. Obviously the size and shape of the neighborhood used will have a very strong influence on the effect

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