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Vision Systems Questions

Question Asked:

Can you tell me how to eliminate modification of ambiental light on my camera image acquisition? I have a B&W cognex camera with integrated red led light and I want to find a simple area of a black blob, but ambiental light is changing and my blob is changing his brightness.

4 Answers

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  • = Answered Questions

Brian Durand - President
I4 Solutions, LLC
bdurand [at] i4solutions [dot] us
(612) 888-6000

If the ambient light is sunlight, there isn't much you can do other than to block it. Otherwise, mount a red bandpass filter on the lens. You'll want the filter to match the wavelength of the light. For example, if the LED outputs 660 nm light, use a 660 nm bandpass filter. This will block other colors of light, hopefully enabling the camera's light to overwhelm the ambient light. If that doesn't work well, you can replace the camera's light with one more powerful, and combine that with a bandpass filter..

Andrew Long - CEO
Cyth Systems, Inc.
andy [dot] long [at] cyth.com

Dan, Let me refer you to some educational videos produced by the AIA that can explain the importance of lighting, along with other items. https://www.visiononline.org/certified-vision-professional-basic-training This might help you figure out some of the issues that you are having, and also explain the different challenges with setting up a machine vision system. Betst of Luck, A.

James Gardiner - Sales Account Manager
Metaphase Technologies Inc.
j [dot] gardiner [at] metaphase-tech.com
(215) 639-8699

As Brian @ I4 Solutions has mentioned, adding a band-pass filter with the camera to make the wavelength of the light out is the most cost effective solution.

Marino Jelavic - Vice President Sales and Marketing
Sundance Digital Signal Processing, Inc.
marjelavic [at] gmail [dot] com
(514) 684-8315

Hi Dan, a) Try histogram equalization techniques b) Try frame averaging Best regards, Marino Jelavic,

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