I did some research and found out that this is a Poppler bug and is
related to this bug :

http://lists.freedesktop.org/archives/poppler-bugs/2007-February/000828.html
also https://bugs.launchpad.net/ubuntu/+source/poppler/+bug/199916

In order to fix the above bug the interpolation default  was turned off
(interpolate = gFalse in Gfx.cc)

The core problem is that the cairo backend only seems to do either full
bilinear interpolation or none (nearest neighbour) while it should
ALWAYS filter during minification and either interpolate or edge smooth
during magnification. Until this is available they should put the
interpolation default back on.

-- 
Evince doesn't anti-alias graphics
https://bugs.launchpad.net/bugs/248355
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