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Know Your Limits: Accuracy of Long Range Stereoscopic Object Measurements in Practice
Peter Pinggera1, 2, David Pfeiffer1, Uwe Franke1, and Rudolf Mester2, 3
1Environment Perception, Daimler R&D, Sindelfingen, Germany
2VSI Lab, Computer Science Dept., Goethe University Frankfurt, Germany
3Computer Vision Laboratory, Dept. EE, Linköping University, Sweden
Abstract. Modern applications of stereo vision, such as advanced driver assistance systems and autonomous vehicles, require highest precision when determining the location and velocity of potential obstacles. Subpixel disparity accuracy in selected image regions is therefore essential. Evaluation benchmarks for stereo correspondence algorithms, such as the popular Middlebury and KITTI frameworks, provide important reference values regarding dense matching performance, but do not sufficiently treat local sub-pixel matching accuracy. In this paper, we explore this important aspect in detail. We present a comprehensive statistical evaluation of selected state-of-the-art stereo matching approaches on an extensive dataset and establish reference values for the precision limits actually achievable in practice. For a carefully calibrated camera setup under real-world imaging conditions, a consistent error limit of 1/10 pixel is determined. We present guidelines on algorithmic choices derived from theory which turn out to be relevant to achieving this limit in practice.
LNCS 8690, p. 96 ff.
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© Springer International Publishing Switzerland 2014