Regular colonoscopy has always been regarded as a complicated procedure requiring a tremendous amount of skill to be
safely performed. In deed, the practitioner needs to contend with both the tortuousness of the colon and the mastering of
a colonoscope. So, he has to take the visual data acquired by the scope's tip into account and rely mostly on his common
sense and skill to steer it in a fashion promoting a safe insertion of the device's shaft. In that context, we do propose a
new navigation clue for the tip of regular colonoscope in order to assist surgeons over a colonoscopic examination.
Firstly, we consider a patch of the inner colon depicted in a regular colonoscopy frame. Then we perform a sketchy 3D
reconstruction of the corresponding 2D data. Furthermore, a suggested navigation trajectory ensued on the basis of the
obtained relief. The visible and invisible lumen cases are considered. Due to its low cost reckoning, such strategy would
allow for the intraoperative configuration changes and thus cut back the non-rigidity effect of the colon. Besides, it
would have the trend to provide a safe navigation trajectory through the whole colon, since this approach is aiming at
keeping the extremity of the instrument as far as possible from the colon wall during navigation. In order to make
effective the considered process, we replaced the original manual control system of a regular colonoscope by a motorized
one allowing automatic pan and tilt motions of the device's tip.