Kramer Electronics SP-14 - Manual (Page 14)

13
Adjustment of MEMC Cadence and Mask
Cadence Detection
[MEMC/FRC Settings ]
Time Code Settings
Input Select 3G-SDI 1
Input Adjust N/A ↓
Press select, to enter the MEMC/FRC menu
Using the up and down arrow keys move Preserve Cadence to the top of the window and press
select
[Preserve Cadence On]↑
Cadence Detect 23-30Hz Non Accepted
Cadence Detect 50-60Hz 3:2, 2:2 only
Advanced .
Cadence detection settings are important to motion compensation algorithms because the
processes required to deal with material that originated in film or film frame rates or has been down
converted for internet use are different to the processes required to motion estimate normal video
content originated with a video camera at 50 or 59.94 or 60 Frames Per Second.
Cadence correction is part of the de-interlacing process which, in order to apply the appropriate
algorithm, must determine if the original movie was shot with a film or video camera.
Terms you may find associated with this process are "cadence detection," "film mode detection,"
"reverse telecine," "inverse telecine" and "reverse 3:2 pull-down."
Advanced correction algorithms can detect almost any repeating cadence which can be the result of
splicing video and film clips together as well as careless editing in the studio.
SP-14 has default settings for the majority of content to help the MEMC process work efficiently
particularly at scene cuts. You can choose different settings if your content requires this but scene
cuts between content of different cadences may result in some linear conversion frames.
Preserve Cadence On/Off
Cadence Preserve adds a film cadence back into the frame rate converted output so that the
underlying temporal information is at a lower frame rate. This preserves the film look of content
shot with cadence. It is also able to track the need to preserve cadence or perform pure video
conversion as scene cuts are detected. For example a soccer match itself will be shot as video, but
sometimes the studio-based content such as pre and post-match interviews are shot with a cadence
to give a sharper film-like look.
With Cadence Preserve on the film look will be maintained on scenes which were shot in this style.
With Cadence Preserve off the output will always be smoother with a video-like feel.