On active contour models and balloons
CVGIP: Image Understanding
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An active contour model with expansion "balloon" forces was used as a tool to simulate the changes in shape and increase in cross-sectional area, which occur during the contraction of isolated muscle fiber. A polygon, imitating the boundaries of the relaxed muscle fiber cross-section, represented the initial position of the active contour model. This contour was then expanded in order to increase the cross-sectional area and at the same time intrinsic elastic properties smoothed the contour. The process of expansion was terminated, when the area of the inflated contour surpassed the preset value. The equations that we give, lead to a controlled expansion of the active contour model.