I am having trouble using the stereo vision toolboxes through DuoDIC, an open-source MATLAB toolbox.

Hello,

After calibrating my cameras and imaging my test sample's deformation, I was successfully able to go through the calibration process via the Stereo Camera Calibrator App. The following steps of DuoDIC involved me first using Ncorr (another open-source MATLAB toolbox for 2D Digital Image Correlation) to image the sample's deformation in two separate 2D configurations. I was also able to complete that successfully. The third step of DuoDIC involves me transforming the pairs of corresponding image points from the speckle images obtained in step 2 into 3D points and surfaces, using the calibration parameters already computed in step 1.

However, after reconstruction, MATLAB generated this 3D plot which I believe should show the spatial distribution of the tracked surface. But I am not seeing recognizable surfaces, but rather, what seems like to me, artifacts. I thought there was a problem with my deformation imaging, so I imaged a static tube instead and see if the software would recognize its shape. However the problem persists.

Please let me know what you think I should do next to troubleshoot and point me in the right direction! Thank you!

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All the best

Static tube during imaging (from camera 1's angle. Camera 2's angle is slight different by 10degrees):

3D re-constructed result (XY plane is the image plane):

[Qu Cao]

Do you minding sharing the stereo camera parameters and the images hjere so that we can assist you with the issue?

[Yi Yi]

Sure, the Ncorr camera parameters are: Subset radius = 27, Subset spacing 3, high deformation (strain propagation enabled) with manual seeding. I already tried changing the high deformation settings around but to no avail.

The images are actually just a series of the tube being static. In my latest test trial, I just had 3 images of the static tube because I wanted to see if the deformation is causing my data plot to go wrong. The 6 images (3 from camera 1 and 3 from camera 2) are below:

camera_1:

camera 2:

(The pictures are from a 240fps video. They aren't the same photo. Just the tube is static.)

Thank you so much!

[Qu Cao]

Thank you for sharing the images. Could you also share the stereo camera parameters you obtained from the calibration app?