Fast Checkerboard Demodulation for digital Schlieren imaging

Version 1.0.0.1 (22.8 KB) by S Wildeman

Track optical distortions in a checkerboard pattern with high accuracy in real-time using the FCD method

https://github.com/swildeman/fcd

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Updated 9 Dec 2018

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Collection of functions for tracking optical distortions in a checkerboard pattern (or any other 2D periodic pattern) using 2D Fourier demodulation. Can be used for e.g. Synthetic/Background-oriented Schlieren (BOS) imaging or lens calibration. All functions are well documented and some usage examples are included.

Features:
- Robust full-field 2D distortion tracking with high dynamical range
- Can typically track displacements as small as 0.01 pixels and up to about 4 pixels (For larger displacements phase unwrapping may be required. A basic implementation for this is included.)
- Can resolve high virtual strains: up to about 0.7 px/px.
- Returns dense vector fields (one vector per pixel)
- Includes several schemes for integrating gradient fields (some of them support ROIs).
- Very fast due to extensive use of FFT
- Includes a live preview function
- Runs on GPU without modifications

More info: https://arxiv.org/abs/1712.05679

Cite As

Wildeman, Sander. “Real-Time Quantitative Schlieren Imaging by Fast Fourier Demodulation of a Checkered Backdrop.” Experiments in Fluids, vol. 59, no. 6, Springer Nature, May 2018, doi:10.1007/s00348-018-2553-9.

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MATLAB Release Compatibility

Created with R2016b

Compatible with any release

Platform Compatibility

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Version	Published	Release Notes
1.0.0.1	9 Dec 2018	updated citation info and extended description
1.0.0.0	18 May 2018	updated github link added a figure to the description

To view or report issues in this GitHub add-on, visit the GitHub Repository.

MLA	Wildeman, Sander. “Real-Time Quantitative Schlieren Imaging by Fast Fourier Demodulation of a Checkered Backdrop.” Experiments in Fluids, vol. 59, no. 6, Springer Nature, May 2018, doi:10.1007/s00348-018-2553-9.
APA	Wildeman, S. (2018). Real-time quantitative Schlieren imaging by fast Fourier demodulation of a checkered backdrop. Experiments in Fluids, 59(6). Springer Nature. Retrieved from https://doi.org/10.1007%2Fs00348-018-2553-9
BibTeX	@article{Wildeman_2018, doi = {10.1007/s00348-018-2553-9}, url = {https://doi.org/10.1007%2Fs00348-018-2553-9}, year = 2018, month = {may}, publisher = {Springer Nature}, volume = {59}, number = {6}, author = {Sander Wildeman}, title = {Real-time quantitative Schlieren imaging by fast Fourier demodulation of a checkered backdrop}, journal = {Experiments in Fluids} }