Color-Based Road Detection and its Evaluation on the KITTI Road Benchmark
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1 Color-Based Road Detection and its Evaluation on the KITTI Road Benchmark Bihao WANG 1,2, Vincent Frémont 1,2, Sergio Alberto Rodríguez Florez 3,4 1 Université de Technologie de Compiègne (UTC) 2 CNRS Heudiasyc UMR Université Paris-Sud 4 CNRS Institut d Eléctronique Fondamentale UMR
2 Outline Introduction Road detection system System overview Binary map method Confidence map method Evaluation Perspective 2
3 Outline Introduction Road detection system System overview Binary map method Confidence map method Evaluation Perspective 3
4 Introduction Objective: Environment Understanding Traffic Safety Collision avoidance Traffic Efficiency Path planning Method: Appearance character Primary detection from intrinsic image Geometric structure Plan extraction by stereo vision Likelihood distribution 4
5 Introduction KITTI-Road Benchmark [Fritsch2013] 2 Dataset: Urban Unmarked road Urban Marked two way road, Urban Marked Multiple lane road Result presentation Perspective View, Bird-Eye View Evaluation F1-measure, Accuracy, Average Precision, etc. 2 Jannik Fritsch, Tobias Kuehnl, and Andreas Geiger, "A new performance measure and evaluation benchmark for road detection algorithms", International Conference on Intelligent Transportation Systems, IEEE
6 Outline Introduction Road detection system System overview Binary map method Confidence map method Evaluation Perspective 6
7 Outline Introduction Road detection system System overview Binary map method Confidence map method Evaluation Perspective 7
8 Road Detection System Overview [Wang2013] 1 1 Bihao Wang and Vincent Frémont. Fast road detection from color images, IEEE Intelligent Vehicles Symposium (IV), ,
9 Pre-processing Road Detection System Pre-processing: Intrinsic image 9
10 Pre-processing Road Detection System p I θ χ = U [ ρ1, ρ2, ρ3] = ( χ, χ ) log-chrom 1 2 ρ 1,2,3 3 log(,, / ) = RGB R B G U = 1/ 2, 1/ 2,0; 1/ 6, 1/ 6,2/ 6 T Intrinsic image [Finlayson2009] 3 θ( η min ) I θ = χ cosθ + χ sinθ 1 2 I θ (grayscale 10) 3 Finlayson, Graham D., Mark S. Drew, and Cheng Lu. "Entropy minimization for shadow removal." International Journal of Computer Vision 85.1 (2009):
11 Road Detection System Primary Detection Primary Detection: Confidence interval classification 11
12 Road Detection System Primary Detection Selected samples from hypothetic road area [Alvarez2011] 4 follow a Gaussian distribution. Confidence Level: 1 α = 0.7, 0.8, 0.9, IR = 1, if λ1 Iθ ( p) λ2 Confidence Interval: I R = 0, otherwise p : pixel Primary detection result: I R 4 Alvarez, J.M.A. and Lopez, A.M., "Road detection based on illuminant invariance", Intelligent Transportation Systems, IEEE Transactions on, 12(1),
13 Road Detection System Plane Extraction Plane Extraction: V-disparity map 13
14 Road Detection System Plane Extraction In V-disparity map, road profile can be described as : v = a v+ b Ground plane extraction result I G for each pixel p if [ ±ε ] then, I p v v G = 1; else, I = 0. G ε v The range of variance for ground plane extraction of each row in the image is positive related to its distance to the camera. v 14
15 Road Detection System Integration Processing Integration Processing 15
16 Road Detection System Integration Processing I R Primary road detection result from intrinsic image I G Ground plane extraction result from stereo vision (V-disparity) Iroad = IR IG Intersection calculation Free road surface detection result 16
17 Outline Introduction Road detection system System overview Binary map method Confidence map method Evaluation Perspective 17
18 Improvements Binary Map Narrowed confidence interval for primary detection Set I R as ROI to speed up V-disparity accumulation Refinement of road profile in V-disparity map Dynamic bound for Plane extraction: ε = c v Compensation of the holes caused by disparity map. v Before After 18
19 Outline Introduction Road detection system System overview Binary map method Confidence map method Evaluation Perspective 19
20 Pre-detection Plane extraction Confidence Map u+ 1 v+ 1 L( uv, ) I (, i j)/9 R = i= u 1 j= v 1 R = median( ( p )) v ex : L = 5 / 9 = The pixels whose neighbors are mostly pre-detected as road area have a higher likelihood of being on the road surface. For each row of the image: L( uv, ) = 1 ( uv, ) / R 1 LG = LG (1 + sgn( LG)) 2 G I v v v --- road profile --- eliminate negative value --- deviation 20
21 Confidence Map Likelihood combination L( uv, ) = L( uv, ) L( uv, ) c R G Confidence map outperforms binary map in non flat ground scene. It avoids the ambiguity of road profile in V-disparity map. 21
22 Outline Introduction Road detection system System overview Binary map method Confidence map method Evaluation Perspective 22
23 Evaluation URBAN - BEV Space F max In the comparison, binary map detection (BM) performs the best in the measurement of Recall and False Negative Rate, and the Second in F1-measure. 5 T. Kuehnl, F. Kummert, and J. Fritsch., Spatial ray features for real-time ego-lane extraction. In Proc. IEEE Intelligent Transportation Systems, Jose M. Alvarez, Theo Gevers, Yann LeCun, and Antonio M. Lopez., Road scene segmentation from a single image. In ECCV 2012, volume 7578 of Lecture Notes in Computer Science, pages Springer Berlin Heidelberg,
24 Evaluation UM Perspective space * F max AP Acc. Prec. Rec. FPR FNR BL BM CM UMM Perspective Space* F max AP Acc. Prec. Rec. FPR FNR BM CM BL UU Perspective Space * F max AP Acc. Prec. Rec. FPR FNR BL BM CM The confidence map method (CM) outperforms the improved binary map method (BM) on the measurement of Precision Both BM method and CM method outperform the Baseline result on the F1-Measure and Accuracy Current CM method still need to be improved to face more complex environment * Perspective space evaluation is applied on training dataset 24
25 Evaluation Binary Map It provides a straightforward information of free road area without training * Confidence Map It can cope with more complex environment like non-flat road. * Procedure of finding a proper threshold for confidence map through PR curve on training dataset. 25
26 Outline Introduction Road detection system System overview Binary map method Confidence map method Evaluation Perspective 26
27 Perspective Automatic seeds selection New likelihood construction On-road obstacle detection Tracking of road structure 27
28 28
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