PID Controller using video analysis

[matheus08]

Hi,

I am developing a PID controller, using video analysis.

The system works as follows: A potential difference is applied to an actuator that deforms mechanically. A camera captures the shift and sends a signal to the controller.

However, it is necessary to convert the image data into an electrical signal.

How can I do this?

[paw510]

This is a general software question, nothing to do with the instrument control thread.

It might need a quite complex algorithm to be reliable, depending on the geometry, image quality etc.  Why not use a simple strain gauge ?