In ObjectCountingApplication, some detected polygons are not properly erased
Mantis Issue 66, reported by jmichel, assigned to cvalladeau, created: 2009-01-06
When triggering the Preview button again, all detected objects should be cleared, but there are some left.
1231339111 - C ValladeauCorrected
1231513263 - C ValladeauCorrected by Cyrille.