Multiresolution Image Shape Description - download pdf or read online

By John M. Gauch

Much of our knowing of the relationships between geometric struc­ tures in photographs relies at the form of those buildings and their relative orientations, positions and sizes. therefore, constructing quantitative equipment for taking pictures form info from electronic photos is a crucial quarter for laptop imaginative and prescient learn. This ebook describes the idea, implemen­ tation, and alertness of 2 multi solution picture form description tools. the writer starts off via motivating the necessity for quantitative tools for describing either the spatial and depth diversifications of struc­ tures in grey-scale photographs. new equipment which catch this informa­ tion are then built. the 1st, the depth axis of symmetry, is a set of branching and bending surfaces which correspond to the skeleton of the picture. the second one approach, multiresolution vertex curves, specializes in floor curvature houses because the snapshot is blurred via a series of Gaussian filters. Implementation concepts for those photo form descriptions are defined intimately. floor functionals are mini­ mized topic to symmetry constraints to acquire the depth axis of symmetry. strong numerical equipment are constructed for calculating and following vertex curves via scale area. ultimately, the writer demon­ strates how grey-scale photographs will be segmented into geometrically coher­ ent areas utilizing those form description options. development quantita­ tive research functions when it comes to those visually brilliant photograph areas offers to be a thrilling region of biomedical laptop imaginative and prescient learn. v Acknowledgments This publication is a corrected and revised model of the author's Ph. D.

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This can be viewed as a function ofthree variables (u, v, C), where C represents one of the three coordinate functions of the lAS (x, y, J). This three-dimensional function is represented as a matrix of integer values and stored in an image using the /usr/image format [Zimmerman, 1981]. 2. Simultaneous Calculation of Axes 35 this image give the (x, y) coordinates of the lAS point while the (u, v, 2) entry gives the intensity value I at this point. One advantage of this representation is that the existing /usr/image display tools can be used to study the coordinates of the lAS to gain a better understanding of the lAS surface and the behavior of the MIN_SURFACE program.

62 4. 6. An abdominal CT image (top and center) and a dental radiograph (bottom) and a collection of anatomical structures associated with individual lAS regions for these images (right).

Computing the lAS REPRESENTING AN ACTIVE SURFACE REGION The two patches of involute points which define an active surface region can be represented as two non-intersecting sets of (u, v) coordinates. These two sets are initialized with the coordinates of the seed point and its involute respectively. As the region growing algorithm proceeds, it is necessary to record the coordinates of the neighboring pixels of these two patches. This introduces two additional sets of (u, v) coordinates. The coordinates of these neighboring pixels are recalculated after each iteration and used in the region growing algorithm described above.

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