Driving assistance system

A driving assistance system provided in a vehicle that a driver operates, the system comprising:

• a detection unit that detects a distribution of a driver's gaze;
• an ideal computation unit that computes an ideal probability distribution of a driver's gaze, from the distributions detected in a past and information, wherein the information is derived from the vehicle and a periphery surrounding the vehicle, the ideal computation unit including
• an imaging unit that obtains image information ahead of the vehicle:
• a visual-field-image accumulation unit that accumulates image information corresponding to a driver's visual-field from the obtained image information and the detected distributions;
• a first computation unit that computes a probability distribution of a driver's gaze required for steering operation for traveling a road after obtaining a shape of the road from the accumulated image information, to thereby output a first result;
• a second computation unit that computes a probability distribution of a driver's gaze expected from a visual characteristic of the accumulated image information, to thereby output a second result;
• and
• an addition unit that adds up the outputted first result and the outputted second result to thereby obtain the ideal gaze probability distribution;
• a risk determination unit that determines presence of a risk when a difference between the detected distribution and the computed ideal probability distribution exceeds a given threshold;
• and
• an output unit that outputs a result determined by the risk determination unit.