Destroy all OCR classificators.
close_all_ocrs deletes all OCR classificators and frees the used memory space. All the trained data will be lost.
Since all classificators are closed by close_all_ocrs all handles become invalid.
If it is possible to close the OCR classificators the operator close_all_ocrs returns the value 2 (H_MSG_TRUE). Otherwise an exception handling is raised.
close_all_ocrs is processed completely exclusively without parallelization.
Optical character recognition
