Affine optic flow
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업데이트 날짜: 2016/3/4
An affine (or first-order) optic flow model has 6 parameters, describing image translation, dilation, rotation and shear. The class affine_flow provides methods to estimates these parameters for two frames of an image sequence.
The class implements a least-squares fit of the parameters to estimates of the spatial and temporal grey-level gradients. This is an extension of the well-known Lucas-Kanade method. The images are either sampled conventionally, on a rectilinear grid, or on a log-polar grid. In the latter case, the class may iteratively refine its estimates by moving the sampling grid to track the motion. Options to specify a region of interest and smoothing and sampling parameters are provided.
The file includes a demonstration of the class, and test images for this. The functions for smoothing images and estimating gradients may be useful independently, and log-polar sampling functions are included (and are available separately in submission 27023).
David Young (2023). Affine optic flow (https://www.mathworks.com/matlabcentral/fileexchange/27093-affine-optic-flow), MATLAB Central File Exchange. 검색됨 .
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- Image Processing and Computer Vision > Computer Vision Toolbox > Tracking and Motion Estimation > Motion Estimation >
- Image Processing and Computer Vision > Image Processing Toolbox > Image Filtering and Enhancement > ROI-Based Processing >
- Engineering > Electrical and Computer Engineering > Optics >
받음: Log-polar image sampling, Extended array indexing, Gradients with Gaussian smoothing
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Fixed bug which caused error when sample step was greater than 1.
Minor corrections to comments.
Changed order of arguments in gsmooth2 and gradients_xyt.
Changed from a function to a class, for more efficient application to image sequences. (Argument checking etc. can be moved outside a loop, and some intermediate computations can be saved for later use.)
Fixed bug in use of ROI, allowed ROI in conjunction with log-polar sampling, simplified gradient computation by using exindex, minor changes to demo.