I image wood textured surface covered with glass.
Camera positioned perpendicular to imaged surface
Illumination done using Parallel light source.
Light falls perpendicular to imaged surface.
When there is no glass camera shows image with uniformal brightness across the
field – what I would expect.
When image overlaid with glass camera depicts bright spot right in the centre of
As it is shown here:
What causes bright spot? Is it reflection of light source? But there is no
source, all light rays a parallel and fall perpendicularly to the surface. What
causes bright spot?
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