[gstreamer-bugs] [Bug 635646] New: [opencv] Add cvcalchist element for calculating histogram [PATCH]

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=635646
  GStreamer | gst-plugins-bad | unspecified

           Summary: [opencv] Add cvcalchist element for calculating
                    histogram [PATCH]
    Classification: Desktop
           Product: GStreamer
           Version: unspecified
        OS/Version: All
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: josh at joshdoe.com
         QAContact: gstreamer-bugs at lists.sourceforge.net
      GNOME target: ---
     GNOME version: ---


Created an attachment (id=175134)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=175134)
Patch to add cvcalchist

Added the element cvcalchist which wraps the OpenCV function cvCalcHist. Only
8- and 16-bit monochrome video is supported at this time. By default the
element will not alter the data, but if "draw-histogram" is true, then a crude
histogram will be drawn over the image.

I've included a test program under tests/examples/opencv that draws a text
histogram to the console using the "histogram" message.

Please review the patch, as I'm sure there are some issues. I wasn't sure of a
nice way to handle RGB histograms, especially in terms of how to package the
data in a message, so I left that alone for the time being. Also note I'm
developed this under Windows, but hopefully I've modified the Makefiles
appropriately.

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