Method and device for aiding the navigation of a vehicle

An assistance system for assisting driving a vehicle, the assistance system comprising:

• an evaluation device comprising a processor configured to construct a digital model defining a quality index for a three dimensional (3D) inference image resulting from applying a first 3D inference method of a plurality of 3D inference methods to an original image as a function of a plurality of similarity metrics defined between the original image and the 3D inference image, by
• using a set of observations obtained for a plurality of reference 3D inference images resulting from applying at least one 3D inference method of the plurality of 3D inference methods to a plurality of reference original images, said observations comprising measured values for 3D information represented on the reference 3D inference images, evaluating, for each of the observations:
• the quality index defined by the digital model by using the pixel values of the reference 3D inference images and the measured values of the 3D information represented by those pixels, and
• the plurality of similarity metrics by using the pixel values of the reference 3D inference images and the pixel values of the corresponding reference original images, and
• determining the digital model by applying a regression technique to the quality indices and the evaluated similarity metrics;
• an acquisition device configured to acquire a first image of a 3D scene that might have an influence on the driving of the vehicle;
• and
• a 3D inference device configured to use the first image to generate a second 3D inference image by applying the first 3D inference method or a second 3D inference method of the plurality of 3D inference methods to the first image, wherein
• the processor of the evaluation device is configured to evaluate the quality of the second 3D inference image by:
• estimating said plurality of similarity metrics between said first image and said second 3D inference image, and
• evaluating the quality index of the second 3D inference image by using the digital model and said plurality of estimated similarity metrics, and
• said assistance system is configured to use the second 3D inference image as a function of the estimated quality index.