Add rollingsum filter for frame analysis based on column mean deviation

- Implements GStreamer element that analyzes pixel columns
- Drops frames when column mean deviates from rolling baseline
- Configurable window size, column index, stride, and threshold
- Includes design documentation and build script
- Tested successfully with IDS uEye camera source

gst/rollingsum/CMakeLists.txt

@@ -0,0 +1,28 @@
+set (SOURCES
+  gstrollingsum.c
+  )
+    
+set (HEADERS
+  gstrollingsum.h)
+    
+include_directories (AFTER
+  ${ORC_INCLUDE_DIR})
+
+set (libname gstrollingsum)
+
+add_library (${libname} MODULE
+  ${SOURCES}
+  ${HEADERS})
+  
+target_link_libraries (${libname}
+  ${ORC_LIBRARIES}
+  ${GLIB2_LIBRARIES}
+  ${GOBJECT_LIBRARIES}
+  ${GSTREAMER_LIBRARY}
+  ${GSTREAMER_BASE_LIBRARY}
+  ${GSTREAMER_VIDEO_LIBRARY})
+  
+if (WIN32)
+  install (FILES $<TARGET_PDB_FILE:${libname}> DESTINATION ${PDB_INSTALL_DIR} COMPONENT pdb OPTIONAL)
+endif ()
+install(TARGETS ${libname} LIBRARY DESTINATION ${PLUGIN_INSTALL_DIR})