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Well the idea is to have a system that measures diameters from 100 microns to 10mm , it should be costless. Considering this method, it is the easier way to achieve if I deal with a halogen lamp (threshold will be 50% in that case): a telecentric backlight illumination which is simple to...

Dan, Thank your for this article, it is really good. However, I still have the same problem in getting the exact value of the threshold. [sad]

Thanks for the answer. In the attachment, you will find a draw of the method. As I am looking for an edge detection to measure my piece, the pattern of the projected light on the linear CCD is shown in the same attachment. This pattern is clearly a Fresnel diffraction one. Normally, with a...

Dear all, I have been working on a small project in machine vision. From a telecentric collimated illumination using a high power LED with a small etendue, a round object to measure covers an amount of this light and is projected on a CCD camera creating a shadow. From the pattern of intensity...