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  • I like the idea, but it seems like you'd need some really really good lighting conditions. In the example image where there is both can and bottle for example this seems a bit hard to make the distinction. Commented Apr 17, 2012 at 0:20
  • In your example, notice how the specularity for the plastic label is much more diffuse than the very bright spots on the can? That's how you can tell. Commented Apr 17, 2012 at 0:38
  • 1
    I see, which kind of color space representation would you use in this case to capture specularity in your algorithm? This seems quite tough to get in RGB or HSV Commented Apr 17, 2012 at 0:55
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    What if the light source was behind the can? I think you would not see the highlight. Commented Feb 23, 2014 at 22:17