Download e-book for iPad: Information Processing in Medical Imaging: Proceedings of by Fred L. Bookstein (auth.), Stephen L. Bacharach Ph.D. (eds.)


By Fred L. Bookstein (auth.), Stephen L. Bacharach Ph.D. (eds.)

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Read Online or Download Information Processing in Medical Imaging: Proceedings of the 9th conference, Washington D.C., 10–14 June 1985 PDF

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Extra resources for Information Processing in Medical Imaging: Proceedings of the 9th conference, Washington D.C., 10–14 June 1985

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Xy background peak if { Oif -fa -'> s xy ~ +fa It mask mask t' t of next xy xy image s' xy find nx,ny so, that \ It - t' L xy x+nx , y+ny xy I is minimal Figure 2. Pixel shift method. Image s is histogrammed to h. Mask t is created by thresholding s, and similarly t' from s'. Then s' is shifted along x and y so, that the absolute norm of t-t' is minimal. 42 Figure 3. The righthand image (compare to Figure 1) is shifted in the Y direction. The body contour is now in place. but still some dissimilarities remain.

Notice that the darker regions around the kidneys are displayed as objects, even though medically they are not organs. This is an example of the program finding something which is not semantically meaningful, even though it is understandable why it did so. The major organs are dearly visible. In figure 6c the spinal column has been eliminated by changing the intensity sliders to specify that bright objects not be displayed. It should be emphasized that these regions have been eliminated because they are regions associated with extremal paths whose annihilation intensities did not fall within the specified range.

Introduction Pictorial pattern recognition involves finding and labeling image objects. User interaction with and appreciation of an image frequently requires finding and labeling image objects, for example to allow the measurement of properties of the object or to provide a display which enhances the object. Indeed 3D display by shaded graphics depends on first defining the object to be displayed. Most of the techniques attempted for defining objects work locally, directly with pixel intensity values.

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