Create an empty object tuple.

The operator ::gen_empty_obj creates an empty tuple. This means that the output parameter does not contain any objects. Thus, the operator ::count_obj returns 0. However, ::clear_obj can be called for the output. It should be noted that no objects must not be confused with an empty region. In case of an empty region, i.e. a region with 0 pixels ::count_obj returns the value 1.

Image / region / XLD management