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Trigger is Threshold for background subtraction is set. Main success scenario is Image obtained after erosion and dilation with the patterns set is free of noise. Failure end condition is Substantial amount of noise is left after noise removal. Descriptions are: The patterns for erosion and dilation are set. According to patterns set till now the black and white image is filtered to remove noise. If results are satisfactory then pattern is saved else go back to step 1 of Finamax Supplement. Tertiary Level Use Case Diagram 2 Use case number is thirteen. Use case name is set gateway boundary. UCD is Tertiary Level Use Case Diagram 2