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Issue 139: Stereo PIV implementation#157

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MatTolladay wants to merge 17 commits intoShrediquette:mainfrom
MatTolladay:mat/implementation-of-stereo-PIV-2D3C-issue-139
Draft

Issue 139: Stereo PIV implementation#157
MatTolladay wants to merge 17 commits intoShrediquette:mainfrom
MatTolladay:mat/implementation-of-stereo-PIV-2D3C-issue-139

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@MatTolladay
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This adds a script and a set of functions to help generate 3-D velocity fields using PIV with data from two cameras.
It is incomplete but the Stereo_PIVlab_commandline.mlx script and the get_tan_angles function document what is missing and what needs to be resolved in order to complete the calculation.

The script will load and process images to calibrate the cameras including their relative positions and orientations. It then provides the coordinates of the set of charuco points from a calibration image
The transforms to adjust the images are computable. they now need to be applied prior to piv analysis
Piv analysis is complete now comes the velocity corection component
principle point converted to a world point.
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