A Globally Optimal Data-Driven Approach for Image Distortion Estimation

author: Yuandong Tian, School of Computer Science, Carnegie Mellon University
published: July 19, 2010,   recorded: June 2010,   views: 628
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Slides

Slides
0:00 A Globally Optimal Data-driven Approach for Image Distortion Estimation
0:11 Distortions in the real world
0:38 Problem statement - 1
0:51 Problem statement - 2
1:20 Distortion model
2:00 Related work
3:06 Spaceship returning to the Earth - 1
3:16 Spaceship returning to the Earth - 2
3:34 Spaceship returning to the Earth - 3
3:46 Spaceship returning to the Earth - 4
3:58 Spaceship returning to the Earth - 5
3:59 Spaceship returning to the Earth - 6
4:13 Similar operations for images - 1
4:18 Similar operations for images - 2
4:22 Similar operations for images - 3
4:54 Similar operations for images - 4
4:56 The three components of our algorithm
5:22 NN in image vs. parameter space - 1
5:37 NN in image vs. parameter space - 2
6:06 The three components of our algorithm
6:18 The pull-back operation H
6:51 Non-invertible distortions
7:49 The distribution of training samples
8:01 Training sample distribution - 1
8:11 Training sample distribution - 2
8:23 Training sample distribution - 3
8:39 Training sample distribution - 4
8:49 Number of training samples
10:05 Simulations
10:35 Drift-free video tracking - 1
11:02 Drift-free video tracking - 2
11:08 Drift-free video tracking - 3
11:17 Drift-free video tracking - 4
11:24 Drift-free video tracking - 5
11:55 Water distortions
12:16 Bases for water distortion
12:56 Correcting water distortions
13:31 Video rectification/Surface reconstruction
14:21 Video rectification
14:38 Video tracking - 1
14:53 Video tracking - 2
15:24 Cloth deformation
15:40 Cloth tracking
15:54 Paper bending
16:05 Summary

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Description

Image alignment in the presence of non-rigid distortions is a challenging task. Typically, this involves estimating the parameters of a dense deformation field that warps a distorted image back to its undistorted template. Generative approaches based on parameter optimization such as Lucas-Kanade can get trapped within local minima. On the other hand, discriminative approaches like Nearest-Neighbor require a large number of training samples that grows exponentially with the desired accuracy. In this work, we develop a novel data-driven iterative algorithm that combines the best of both generative and discriminative approaches. For this, we introduce the notion of a “pull-back” operation that enables us to predict the parameters of the test image using training samples that are not in its neighborhood (not ε-close) in parameter space. We prove that our algorithm converges to the global optimum using a significantly lower number of training samples that grows only logarithmically with the desired accuracy. We analyze the behavior of our algorithm extensively using synthetic data and demonstrate successful results on experiments with complex deformations due to water and clothing.

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