A Three-Frame Algorithm for Estimating Two-Component Image Motion
IEEE Transactions on Pattern Analysis and Machine Intelligence
Motion analysis from first-order properties of optical flow
CVGIP: Image Understanding - Special issue on purposive, qualitative, active vision
Performance of optical flow techniques
International Journal of Computer Vision
Depth from defocus: a spatial domain approach
International Journal of Computer Vision
Hypergeometric Filters for Optical Flow and Affine Matching
International Journal of Computer Vision
Degraded Image Analysis: An Invariant Approach
IEEE Transactions on Pattern Analysis and Machine Intelligence
Recovering Affine Motion and Defocus Blur Simultaneously
IEEE Transactions on Pattern Analysis and Machine Intelligence
IEEE Transactions on Pattern Analysis and Machine Intelligence
Robustly estimating changes in image appearance
Computer Vision and Image Understanding - Special issue on robusst statistical techniques in image understanding
Estimation of motion parameters from blurred images
Pattern Recognition Letters
Depth from Defocus vs. Stereo: How Different Really Are They?
International Journal of Computer Vision - Special issue on computer vision research at the Technion
Depth from defocus estimation in spatial domain
Computer Vision and Image Understanding
Computing Optical Flow with Physical Models of Brightness Variation
IEEE Transactions on Pattern Analysis and Machine Intelligence
A Computational Framework for Determining Stereo Correspondence from a Set of Linear Spatial Filters
ECCV '92 Proceedings of the Second European Conference on Computer Vision
Simultaneously Recovering Affine Motion and Defocus Blur Using Moments
ICPR '00 Proceedings of the International Conference on Pattern Recognition - Volume 3
Sequential homotopy-based computation of multiple solutions to nonlinear equations
ICASSP '95 Proceedings of the Acoustics, Speech, and Signal Processing, 1995. on International Conference - Volume 02
Globally optimal rational approximation using homotopy continuationmethods
IEEE Transactions on Signal Processing
Artificial parameter homotopy methods for the DC operating point problem
IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems
Rational filter design for depth from defocus
Pattern Recognition
Pattern Recognition Letters
Hi-index | 0.01 |
This paper presents a homotopy-based algorithm for a simultaneous recovery of defocus blur and the affine parameters of apparent shifts between planar patches of two pictures. These parameters are recovered from two images of the same scene acquired by a camera evolving in time and/or space and for which the intrinsic parameters are known. Using limited Taylor's expansion one of the images (and its partial derivatives) is expressed as a function of the partial derivatives of the two images, the blur difference, the affine parameters and a continuous parameter derived from homotopy methods. All of these unknowns can thus be directly computed by resolving a system of equations at a single scale. The proposed algorithm is tested using synthetic and real images. The results confirm that dense and accurate estimation of the previously mentioned parameters can be obtained.