Abstract. Guarding of an environment by cameras or guards is a longstanding problem in computational geometry. In this paper, we introduce a new type of guarding problems called $\Gamma$-guarding using staircase visibility. A point inside an orthogonal environment is said to be staircase visible for a given camera if there exists a staircase path from camera to the point so that it is completely contained in the environment. In this model, we place a small number of guards inside an orthogonal polygon so that each point of polygon is staircase visible through at least four directions. We present an algorithm for $\Gamma$-guarding an arbitrary orthogonal polygon that yields an upper bound for the number of guards that protect an orthogonal polygon through four directions.
AMS Subject Classification: 68U05, 68R01

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DOI: 10.12732/ijam.v29i1.8

Volume: 29
Issue: 1
Year: 2016