Computer vision approaches referred as ETA (Electronic
Travel Aids) constitute a promising alternative to solve the
above problems. In the technical literature there are various
methods introduce in order to help the localization and
navigation of visually impaired/blindOne of the first papers was presented by Walker et at. [5]
that proposed a fusion of sensor modalities (e.g. foot-mounted
pedometer, 3-axis gyroscope and 20 laser scanner) to help
indoor localization. By means of visual SLAM techniques
[6], [7] it is possible to build an incremental map of the
environment, providing simultaneously temporal location and
spatial orientation of the user. In [8] a stereo vision system is
introduce that estimates a 3D map of vicinity trough a 6
degree of freedom egomotion algorithm. The resulted map is
then used to detect over head obstacles during the user
navigation.ฟ people.