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  Indian J Med Microbiol
 

Figure 2: An example of an MS ray in (a), where the POI is indicated with X and the target point is indicated with A. We can see that applying an affinity constraint limits the selection of pixels to those which belong to the background, resulting in the shortest path, one which circumvents obstructions

Figure 2: An example of an MS ray in (a), where the POI is indicated with X and the target point is indicated with A. We can see that applying an affinity constraint limits the selection of pixels to those which belong to the background, resulting in the shortest path, one which circumvents obstructions