Et voila!

Edge detection on a clear black & white image, using an "USB microscope cam".

Next:

• Detection of rectangles (Components) and circles (Fiducials).
• Compute centroid.
• Compute angle deviation for rectangles.
• Make real scale grid for calibration.

Brainstorm:

• Test type of ilumination (Red leds or white leds). Actually the microscope use 3 white leds.
• Use hardware system FPGA+CAM (DE0 Nano) or software system (OpenMV) as an independent detection module. Expensive but beautifull.