  Visually impaired persons have significant problems in their everyday
movement. Therefore, some of our previous work involves computer vision in
developing assistance systems for guiding the visually impaired in critical
situations. Some of those situations includes crosswalks on road crossings and
stairs in indoor and outdoor environment. This paper presents an evaluation
framework for computer vision-based guiding of the visually impaired persons in
such critical situations. Presented framework includes the interface for
labeling and storing referent human decisions for guiding directions and
compares them to computer vision-based decisions. Since strict evaluation
methodology in this research field is not clearly defined and due to the
specifics of the transfer of information to visually impaired persons,
evaluation criterion for specific simplified guiding instructions is proposed.
