Xing Mei ; Xun Sun ; Mingcai Zhou ; Shaohui Jiao ; Haitao Wang ; Xiaopeng...
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Transcript of Xing Mei ; Xun Sun ; Mingcai Zhou ; Shaohui Jiao ; Haitao Wang ; Xiaopeng...
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Xing Mei ; Xun Sun ; Mingcai Zhou ; Shaohui Jiao ;
Haitao Wang ; Xiaopeng Zhang Samsung Advanced Institute of Technology, China Lab
Computer Vision Workshops, 2011 IEEE
On Building an Accurate Stereo Matching System on
Graphics Hardware
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Outline• Introduction• Related Works• Algorithmn• CUDA Implementation• Experimental Results• Conclusion
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Introduction
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IntroductionDense two-frame stereo matching
• Compute a disparity map from stereo images.• Broad applications: 3D reconstruction, view interpolation
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Related Works
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Related Works• Local methods• Compute each pixel’s
disparity independently over a local support region.• Fast but inaccurate.
•Global methods• Solve the stereo problem in
an energy minimization process.• Accurate but slow due to
time-comsuming global optimizer.(GC,BP)
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Related Works• Propagation-based methods• Produce quasi-dense or dense disparity results from a set of seed pixels.
• Relatively fast but sensitive to early wrong matches• use segmented regions as guided propagation unit• expensive cost
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Related Works• Introduce a simple guided unit for propagation
: pixel-wise 1D line segments. • No image segmentation required here.• Simple, fast and accurate
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Algorithmn
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Algorithmn• Framework
Multi-step Disparity Refinement
Scanline Optimization
Cross-based Cost Aggregation
AD-Census Cost InitializationInput: Stereo images
Output: Disparity map
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Algorithmn
Multi-step Disparity Refinement
Scanline Optimization
Cross-based Cost Aggregation
AD-Census Cost InitializationInput: Stereo images
Output: Disparity map
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Disparity Cost Computing• Cost mesure : AD, BT, gradient-based measures, non-
parametric transforms(rank/census[3])......• Combination : SAD + gradient[6] , AD + Census• AD (Absolute Distance)• Constant color assumption• Repetitive structures
• Census • Encodes local image structures • Textureless regions
[3] H. Hirschmuller and D. Scharstein. “Evaluation of stereo matching costs on images with radiometric differences.”IEEE TPAMI, 31(9):2009.[6] A. Klaus, M. Sormann, and K. Karner. “Segment-based stereo matching using belief propagation and a self-adapting dissimilarity measure.” ICPR,2006.
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AD-Census Cost Initialization+• p : pixel• d : level• >> a robust function on variable 𝑐
•
• pd = (x-d,y) in the right image
• : Hamming distance[22]
[22] R. Zabih and J. Woodfill. “Non-parametric local transforms for computing visual correspondence.” In Proc. ECCV, 1994.
d
Left I Right I
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Census Transform
1 1 0 0 0
1 1 0 0 0
1 1 X 0 0
0 0 0 1 1
1 1 1 1 1
121 130 26 31 39
109 115 33 40 30
98 102 78 67 45
47 67 32 170 198
39 86 99 159 210
1 1 0 0 0 1 1 0 0 0 1 1 0 0 0 0 0 1 1 1 1 1 1 1Census transform window :
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Census Hamming Distance
• Left image
• Right image
Hamming Distance = 3
1 1 0 0 0 1 1 0 0 0 1 1 0 0 0 0 0 1 1 1 1 1 1 1
1 1 1 0 0 1 1 0 0 1 0 1 0 0 0 0 0 1 1 1 1 1 1 1
XOR
0 0 1 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0
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AD-Census Cost Initialization
+
• > >> a robust function on variable 𝑐
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AD-Census Cost Initialization
• AD-Census measure produces proper disparity results for both repetitive structures and textureless regions.
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Algorithmn
Multi-step Disparity Refinement
Scanline Optimization
Cross-based Cost Aggregation
AD-Census Cost InitializationInput: Stereo images
Output: Disparity map
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• Cross construction
• Line ending points P1, P2 for P are located when rule 1 or 2 are violated:R1: Color self-similarity in the line region: smooth depth assumption
R2: Arm length limitation: avoid over-smoothness
Cross-based Cost Aggregation[23]
[23] K. Zhang, J. Lu, and G. Lafruit. “Cross-based local stereo matching using orthogonal integral images.” IEEE TCSVT,2009.
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Cross-based Cost Aggregation
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Cross-based Cost Aggregation• Enhance cross construction(use pixel p’s left arm and the endpoint pixel pl as an example)
• • •
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Cross-based Cost Aggregation• Cost aggregation
• Run this step for 4 iterations to get stable cost values. • For iteration 1 and 3, aggregated horizontally and then vertically. • For iteration 2 and 4, aggregated vertically and then horizontally.
• Reduce the errors at depth discontinuities.
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Cross-based Cost Aggregation
• Our aggregation method can better handle large textureless regions and depth discontinuities.
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Cross-based Cost Aggregation
[21] K.-J. Yoon and I.-S. Kweon. “Adaptive support-weight approach for correspondence search.” IEEE TPAMI, 2006.[23] K. Zhang, J. Lu, and G. Lafruit. “Cross-based local stereo matching using orthogonal integral images.” IEEE TCSVT,2009.
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Algorithmn
Multi-step Disparity Refinement
Scanline Optimization
Cross-based Cost Aggregation
AD-Census Cost InitializationInput: Stereo images
Output: Disparity map
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Scanline Optimization[2]
• 4 scanline optimization processes are performed independently.• 2 horizontal directions• 2 vertical directions
𝐶2
𝐶𝑟
𝐶𝑟𝐶𝑟
𝐶𝑟
[2] H. Hirschmuller. Stereo processing by semiglobal matching and mutual information.” IEEE TPAMI, 2008.
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r : directionp-r : the previous pixel along the same direction𝑃1, 𝑃2 : penalize the disparity changes between neighboring
pixels. (𝑃1 ≤ 𝑃2 ) [8]
Scanline Optimization
[8]S. Mattoccia, F. Tombari, and L. D. Stefano. “Stereo vision enabling precise border localization within a scanline optimization framework.” In Proc. ACCV, pages 517–527, 2007.
pp-rr
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Scanline Optimization• The final cost :
• The disparity with the minimum 𝐶2 value is selected as pixelp’s intermediate result.
𝐶2
𝐶𝑟
𝐶𝑟𝐶𝑟
𝐶𝑟
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Algorithmn
Multi-step Disparity Refinement
Scanline Optimization
Cross-based Cost Aggregation
AD-Census Cost InitializationInput: Stereo images
Output: Disparity map
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Multi-step Disparity Refinement• Outlier Handling• Outlier Detection• Iterative Region Voting• Proper Interpolation
• Depth Discontinuity Adjustment• Sub-pixel Enhancement
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Outlier Handling--Detection• The outliers : 𝐷𝐿(p) != 𝐷R(p − (𝐷𝐿(p), 0)) • Outliers are further classified into occlusion and mismatch
points
• p intersect its epipolar line and 𝐷R is checked• If no intersection p is labelled as “occlusion”, otherwise “mismatch”
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Outlier Handling--Iterative Region Voting• Construct cross-based regions and a robust voting scheme
•
• Sp : • 𝜏𝑆, 𝜏𝐻 : threshold values
• 5 iterations
dd
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Outlier Handling--Proper Interpolation• occlusion• The pixel with the lowest disparity value is selected for interpolation• It’s most likely comes from the background
• mismatch points• The pixel with the most similar color is selected for interpolation.
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Depth Discontinuity Adjustment• For each pixel p on the disparity edge, two pixels p1, p2 from
both sides of the edge are collected. • 𝐷𝐿(p) is replaced by 𝐷𝐿(p1) or 𝐷𝐿(p2) if one of the two pixels
has smaller matching cost than 𝐶2(p,𝐷𝐿(p)).
𝐷𝐿(P1
)𝐷𝐿(P) 𝐷𝐿(P2
)
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• Quadratic polynomial interpolation
•
•
• With 3*3 median filter
Sub-pixel Enhancement[20]
[20] Q. Yang, L. Wang, R. Yang, H. Stewenius, and D. Nister. “Stereo matching with color-weighted correlation, hierarchical belief propagation and occlusion handling.” IEEE TPAMI, 2009.
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Multi-step Disparity Refinement
• The average error percentages after performing each refinement step.
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CUDA Implementation
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CUDA Implementation• Compute Unified Device Architecture (CUDA) is a
programming interface for parallel computation tasks on NVIDIA graphics hardware.• The computation task is coded into a kernel function. • The allocation of the threads is controlled with two hierarchical
concepts: grid and block.• A kernel creates a grid with multiple blocks, and each block
consists of multiple threads. Kernel
Grid
Block
Thread
Thread
…
Block …
Grid …
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CUDA Implementation• Cost Initialization: • Parallelize with × 𝑊 𝐻 threads. • Organize into a 2D grid and the block size is set to 32× 32. • Each thread computes a cost value for a pixel at a given disparity. • For census transform, a square window is require for each pixel, which
requires loading more data into the shared memory for fast access.Kernel
Grid
Block
Thread
…
32X32 …
Grid
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CUDA Implementation• Cross-based Cost Aggregation: • A grid with × 𝑊 𝐻 threads.• Cross construction : block size is 𝑊
or 𝐻 to efficiently handle a scan line • Cost aggregation : block size is 32X32• Data reuse with shared memory is
considered in both steps.
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CUDA Implementation• Scanline Optimization: • This step is different, because the process is sequential in the scanline direction and
parallel in the orthogonal direction.• 𝑊 × 𝐷 or × 𝐻 𝐷 threads
• Disparity Refinement: • 𝑊 × 𝐻 threads
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Experimental Results
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Experimental Results• Device : A PC with Core 2 Duo 2.20GHz CPU and NVIDIA
GeForce GTX 480 graphics card• Settings parameters:
• Source : Middlebury http://vision.middlebury.edu/stereo/ HHI database(book arrival) Microsofy i2i database(Ilkay)
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Experimental Results
• The GPU-friendly system brings an impressive 140× speedup.• The average proportions of the GPU running time for the four
computation steps are 1%, 70%, 28% and 1% respectively. • The iterative cost aggregation step and the scanline
optimization process dominate the running time.
Tsukuba Venus Teddy Cones
CPU 2.5 4.5 15 15
GPU 0.015 0.032 0.095 0.094
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Experimental Results
• First row: disparity maps generated with our system. • Second row: disparity error maps with threshold 1. • Errors in unoccluded and occluded regions are marked in black and gray respectively.
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Experimental Results
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Experimental Results• video
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Experimental Results
Snapshots on ’book arrival’ stereo video
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Experimental Results
Snapshots on ’Ilkay’ stereo video
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Conclusion
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Conclusion• Contributions • Present a near real-time stereo system with accurate disparity results.• Combine some known techniques without sacrificing performance and
parallelism to obtain the high quality disparity map.
• Future works• Improve to apply it in real world applications • Robust parameter setting methods
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