tailieunhanh - New Trends and Developments in Automotive Industry Part 6

Tham khảo tài liệu 'new trends and developments in automotive industry part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Context Analysis for Situation Assessment in Automotive Applications 165 Face detection face eyes mouth and nose Face tracking Face analysis and angle of view calculation. Firstly an initialization step is performed for face detection. For each trait the Viola-Jones detector is applied. Secondly the tracking algorithm enables localizing the position of the face in the video frame and evaluating the relative position of every facial trait like the nose the mouth and the eyes. For each trait an instance of Kanade-Lucas-Tomasi KLT feature tracker algorithm has been used. Lastly for each video frame the pose of the face is evaluated in order to extract the angle of view and other relevant information see Fig. 3 . Fig. 3. Internal processing algorithm structure Face analysis has been focused on the evaluation of the driver s view angle which is one of the most important information that is needed to assess his her state. The information concerning the angle of view can be disassembled in yaw rotation with respect to horizontal plane roll longitudinal rotation related to movement and pitch vertical rotation angles as shown in Fig. 4. As a general rule we have assumed having been demonstrated in a large testing phase that the information obtained by the analysis of the yaw component can provide sufficient knowledge about the direction of the driver s gaze. More in detail we can consider that values of the yaw angle near to 0 correspond to the situation of driver looking straight ahead . driver is looking at the street and his her level of attention is adequate while values far from 0 correspond to the case of driver looking in other directions rather than street one . a possible dangerous situation can happen because the driver is absentminded . 166 New Trends and Developments in Automotive Industry Fig. 4. Yaw roll and pitch angles Driver s attention and experimental results The aim of the proposed experiments is not to demonstrate the effectiveness of the .