After inspection with Snellium tools, it may be difficult to give sense to the obtained results. Is the value we got for the MTF acceptable? Is the observed image distortion indicate a defect ? are questions you may ask yourself.
As an answer to these questions, we developed what we call the Degradation Model. It acts as an image processing filter, that will degrade an image in a similar way that a windshield would do.
The Snellium's Degradation Model is based on the experimental images and the metrics our software measures: the Modulation Transfer Function and Digital Image Correlation. From this information, a particular configuration of the model is built for each inspected windshield.
Once built, the model can be applied to any image or video, to reproduce the way it would have been perceived if seen through the windshield.
ADAS Software Test
The main interesting output of the Degradation Model is that it can be used to evaluate the impact of the windshield on the ADAS software.
The procedure is simple: you take street footage and you look at how the ADAS software behaves with it. Then, you simulate the windshield effect on the footage with the Degradation Model, and you look again at the performances of the ADAS software. The comparison will show you how the windshield impacts the ADAS software.
The principal advantage of this method is that it is inexpensive: with one footage, you can do the test for an arbitrary number of windshields, allowing you to easily inspect the impact of the various defects and problems the windshield may have.