Diff Graphs

##YUV Values/ Difference#

Filter Domain: Y, U, V Channels

Filter Name(s): YDIF, UDIF, VDIF

This QCTools filter selects two successive frames of video and subtracts the values of one from the other in order to find the change, or difference, between the two frames (measured in pixels). This information is meaningful in that it indicates the rapidity with which a video picture is changing from one frame to the next. Aside from scene-change scenarios, a video picture should not undergo dramatic changes in these values unless an artifact is present. A scene-change would present as a short but dramatic spike in the graph, and that is normal. Other YUV Difference spikes may be present in cases where picture problems are visible. Often, head problems with corrupted frames will result in large YUV Difference values/graph spikes.

YDIF = Difference of Y Channel between two frames
UDIF = Difference of U Channel between two frames
VDIF = Difference of V Channel between two frames