Back to articles
Articles
Volume: 30 | Article ID: art00006
Image
Realistic Image Degradation with Measured PSF
  DOI :  10.2352/ISSN.2470-1173.2018.17.AVM-149  Published OnlineJanuary 2018
Abstract

Training autonomous vehicles requires lots of driving sequences in all situations[1]. Typically a simulation environment (software-in-the-loop, SiL) accompanies real-world test drives to systematically vary environmental parameters. A missing piece in the optical model of those SiL simulations is the sharpness, given in linear system theory by the point-spread function (PSF) of the optical system. We present a novel numerical model for the PSF of an optical system that can efficiently model both experimental measurements and lens design simulations of the PSF. The numerical basis for this model is a non-linear regression of the PSF with an artificial neural network (ANN). The novelty lies in the portability and the parameterization of this model, which allows to apply this model in basically any conceivable optical simulation scenario, e.g. inserting a measured lens into a computer game to train autonomous vehicles. We present a lens measurement series, yielding a numerical function for the PSF that depends only on the parameters defocus, field and azimuth. By convolving existing images and videos with this PSF model we apply the measured lens as a transfer function, therefore generating an image as if it were seen with the measured lens itself. Applications of this method are in any optical scenario, but we focus on the context of autonomous driving, where quality of the detection algorithms depends directly on the optical quality of the used camera system. With the parameterization of the optical model we present a method to validate the functional and safety limits of camera-based ADAS based on the real, measured lens actually used in the product.

Subject Areas :
Views 51
Downloads 14
 articleview.views 51
 articleview.downloads 14
  Cite this article 

Christian Wittpahl, Hatem Ben Zakour, Matthias Lehmann, Alexander Braun, "Realistic Image Degradation with Measured PSFin Proc. IS&T Int’l. Symp. on Electronic Imaging: Autonomous Vehicles and Machines,  2018,  pp 149-1 - 149-6,  https://doi.org/10.2352/ISSN.2470-1173.2018.17.AVM-149

 Copy citation
  Copyright statement 
Copyright © Society for Imaging Science and Technology 2018
72010604
Electronic Imaging
2470-1173
Society for Imaging Science and Technology