According to the characteristic of abnormal peak and abnormal slant-concave flaw, an automatic extraction algorithm of projection distance was presented individually.

Analysised the relationship of the projection distance to the vehicle body of centroid and the steering center of the vehicle under the conditions of the other side of the Angle control strategy.

The size of the image can be adjusted simply by modifying the distance between the projector and the projection surface; the resulting image remains uniformly clear.