Posted: Wed Jun 19, 2002 4:55 pm Post subject: Color Sens
HI mzsonmez
I would illuminate the beans with a colored light source, which leads to a high contrast between the good and the decayed beans.
After that, use matlabs image processing algorithms to detect the decayed areas (within matlab, you can perform such 'effects' you likely know as emboss, or relief by solving FFT)
The only problem maybe the speed of detection.
If the illumination gives you a high contrast, maybe you dont need image processing -> just use a filter (same wavelength as the resulting contrast)
and a photo diode (its sensitivity must be in the range of the filter wavelength) -> with a simple circuit you can trigger some kick-out mechanismus.
p.s.: you can simply produce a multicolor source holding the backside of a cdrom into a smal ray of sunlight (not for UV).