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Old 18th December 2020, 21:25   #20  |  Link
poisondeathray
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Join Date: Sep 2007
Posts: 5,346
Quote:
Originally Posted by nji View Post
Think of the numbers as the "characteristic values" of the frames they stand for.
The question is how the deduping algorithms define "sequence of similar":
Are the neighboured frames compared, or is the first frame of the sequence
the reference to compare the others to?

They usually compare similarity characteristics either difference from previous, or difference to next. Usually only small areas are sampled, not entire frame for speed purposes . The "%" value is what is used for the threshold

As mentioned earlier, for dedup it's only directly adjacent frame

Position
10 difference from 11
11 difference from 12
.
.
.
An example from a log looks like this

Code:
frm 22: diff from frm 23 = 2.1809% at (160,352)
frm 23: diff from frm 24 = 3.5938% at (256,448)
frm 24: diff from frm 25 = 2.9563% at (128,352)
frm 25: diff from frm 26 = 3.1458% at (160,352)
frm 26: diff from frm 27 = 3.4811% at (256,448)
frm 27: diff from frm 28 = 0.2851% at (416,256)
frm 28: diff from frm 29 = 3.4487% at (256,448)
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