I seek an object’s footprint but I am getting signal-processing artifacts (or maybe just noise) in the force measurement. This is per firmware 0.14.32.
To ensure that object surface irregularities aren’t the cause, I inflated a balloon and pressed it onto the pad (per photo). That should result in a uniform pressure (and force) across the contact area.
I did this several times with different balloons. The data below is typical and from a single frame. In the 2D plot, the variations are apparent. To help visualize this a bit more, see the 3D plot.
Here is a 45 second video on Dropbox which makes the anomalies very apparent.
The relevant API statements follow:
//Set the frame content to scan force data
senselSetFrameContent(handle, FRAME_CONTENT_PRESSURE_MASK | FRAME_CONTENT_CONTACTS_MASK);
senselSetContactsMask(handle, CONTACT_MASK_ELLIPSE | CONTACT_MASK_BOUNDING_BOX);
I would appreciate any pointers to help reduce the variations for this isotropic sample.