def getClasses(self):
    classes = []
    for d in self._boundingBoxes:
        c = d.getClassId()
        if (c not in classes):
            classes.append(c)
    return classes
def getClasses(self):
    classes = []
    for d in self._boundingBoxes:
        c = d.getClassId()
        if (c not in classes):
            classes.append(c)
    return classes