Advances in Image And Video Segmentation by Yu-jin Zhang

By Yu-jin Zhang

Snapshot and video segmentation is among the most important projects of photo and video research: extracting info from a picture or a series of pictures. within the final forty years, this box has skilled major progress and improvement, and has led to a digital explosion of released info. Advances in photograph and Video Segmentation brings jointly the newest effects from researchers occupied with state of the art paintings in snapshot and video segmentation, supplying a suite of recent works made via greater than 50 specialists worldwide.

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N are the wedge limits (supposed to be placed on the edge segments convergent in the center) and {W i}, the intensity distributions associated with the wedges (see Figure 13). Some practical assumptions will reduce the number of parameters to be estimated by a junction detector. First, potential junction centers (xc, yc)may be localized by a local filter, like the Plessey detector (Harris & Stephens, 1988) or, more recently, the SUSAN detector (Smith & Brady, 1997) which declares a corner when the intensity of the center is similar to that of a small fraction of points in the neighborhood.

19 200 250 300 350 400 450 500 550 600 650 20 40 50 60 70 80 90 100 110 120 130 Source: copyright IEEE 2004 where G (θ − θ l(i ) ) denotes the density of a Gaussian kernel centered at a candidate line or circle θ l(i ) and ϖ i denotes the weights (number of votes). Then, Equation 21 quantifies the probability of choosing a given model for a given interval. Besides the probability defined in Equation 22, we need to define the probability of choosing a given point in the interval in order to split it.

Finally, in the last section of the chapter we will introduce a solution inspired in Bayesian inference to the problem of feature extraction and grouping. The type of cost functions described here for solving pathsearching problems (finding contours in images) generalize the cost functions used in contour-based segmentation (snakes models) and allow the researchers to think about existing fundamental limits which constrain the possibility of even solving the problem independently of the algorithm chosen.

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