[Bug 746006] videofilter: Support for convolution based filter to remove speckle noise

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=746006

Sanjay NM <sanjay.nm at samsung.com> changed:

           What    |Removed                     |Added
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 Attachment #299067|0                           |1
        is obsolete|                            |

--- Comment #6 from Sanjay NM <sanjay.nm at samsung.com> ---
Created attachment 303342
  --> https://bugzilla.gnome.org/attachment.cgi?id=303342&action=edit
videofilters: Added filter to remove speckle noise

Added a filter to remove speckle noise.
It support NV, RGB format and is tested with below pipelines

gst-launch-1.0 filesrc location=pm.mp4 ! decodebin ! videoconvert !
"video/x-raw, format={RGB}" ! despeckle ! videoconvert ! ximagesink
gst-launch-1.0 filesrc location=pm.mp4 ! decodebin ! videoconvert ! despeckle !
videoconvert ! ximagesink

Incorporated all previous comments
Request to please review

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