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Lighting Equipment Questions
Is there a light combination that can take pictures of light brown plastic bottle with water droplets to detect if the cap is on straight or if it is crooked? Cap is just slightly darker than bottle. Water droplets are causing problems. Can a blue light help or an IR backlight?
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If space allows, a back light would make it easier. An IR wavelength, say 850 nm, may or may not help "see through" the water. Be sure your camera is sensitive enough in the near IR range, with any internal IR filter removed. Shorter wavelengths (closer to 800 than 900 nm) transmit better through typical lenses. You might also find that a polarizer/analyzer combination helps.
If the requirement is to solely look at the orientation of the cap then you could use a laser line across the top of the cap to visualize the general height profile of the cap as it is pass by a given point. This generated height map will tell you if the cap is tilted.
John, We may be able to assist you with this application, The following is an application that we have done. http://smartvisionlights.com/applications/water-bottle-cap-seal-fill-inspection If you have further questions about this, please feel free to contact Chris Gray at firstname.lastname@example.org, or call our office at 231-722-1199 and ask for Sean in Tech support, Regards, Dave Spaulding