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CPP100
SECTION 6
CPP1OPS
25/10/06
www.snellwilcox.com
Version 1 Issue 6
6.9
Shot Change detection
The presence of a shot change is detected by the analysis of picture difference between frames and fields.
Film material, which is frame based, will generate a strong intra frame correlation i.e. there will be no motion
differences between fields, which originate from the same film frame.
On the other hand, video originated material, which has individual fields representing different points in time
has no frame correlation. Nevertheless, at the presence of a shot change the integrated field and frame
difference outputs will show a distinctive pattern, which can be correlated, to identify the exact field where the
shot change occurs.
The shot change flag is a single line active high immediately after the shot change and is cleared at the end of
the following field.