- Thu Apr 16, 2009 8:57 pm
#70815
I apologize ahead of time for the really quick post, but here are some sample readings from the OLED touchscreen. I put an evenly spaced 5x5 square grid on the screen, and pressed each point on the grid in turn, recording a large number of samples to get a general idea of the touchpad's space.
In general it looks like the output is rotated about 45°, translated, and skewed a bit. It's also affected by pressure, but I haven't graphed that yet. I have manually calibrated the touchscreen with an algorithm that progressively takes the rotation, translation, skew, and finally pressure out of things. It does okay, but definitely needs a bit of work, and needs to be developed into something that can be autocalibrated from a few touch points.
In general it looks like the output is rotated about 45°, translated, and skewed a bit. It's also affected by pressure, but I haven't graphed that yet. I have manually calibrated the touchscreen with an algorithm that progressively takes the rotation, translation, skew, and finally pressure out of things. It does okay, but definitely needs a bit of work, and needs to be developed into something that can be autocalibrated from a few touch points.