how to discard "blurred" frames automatically?

[_ck_]

I noticed that quite a few filters for avisynth/virtualdub detect "blurry" frames (ie. frames with high motion). Most filters in this area are used to detect/deinterlace video.

But instead, I'd like to DISCARD (delete) any frame with motion or high motion (over a certain amount?) and leave me with the low motion or still frames.

Is there ANY way to accomplish this in an automated way?

Thanks for any help/ideas!

[Zarxrax]

Well, avisynth has some sort of functions that can determine the motion in a frame, and I guess you could use that, but I highly doubt it would work anywhere near as well as what it sounds like you want.

Why on earth would you want to do this though?

[Daodan]

I don't think you want to discard them...ar you'll have desync in this case. All I can think of is for you to replace them with a similar one that you like. For this use freezeframe() (manually, I don't know of an automated version).(still, this will probably lead to some jerkiness).

[_ck_]

No I definitely do want do discard them, this is to help sort through thousands of frames that are worthy for stills. Audio won't even be an issue ;)

It occured to me that any frame with a high amount of area that needs to be deinterlaced will most likely not be suitable for stills. High interlace = typically lots of motion = blurry in a still.

As an avisynth newbie (but not a programming newbie) can someone give me a general framework of code that would do this? I can't seem to find the function related to detecting/determining motion...

[hanfrunz]

you could separate the fields with separatefields(). Then use a resizer to get the correct resolution. So you don't have any deinterlacing artefacts.


separatefileds()
lanczosresize(width,2*height)

[foxyshadis]

Unless you selecteven/selectodd, there'll be constant vertical jitter unless you bob properly, or manually compensate for the field shift.

[_ck_]

you could separate the fields with separatefields(). Then use a resizer to get the correct resolution. So you don't have any deinterlacing artefacts.


You are missing my point entirely.

I just want to use the detection of frames that have large areas of de-interlace required to discard them. If you look at any "smart" deinterlace filter with a preview mode to show the areas that need deinterlace, they are the parts in high motion.

A virtually still image has almost no areas needing deinterlace, those are the ones i want to keep because the subject matter will typically be in perfect focus and unblurred (not in motion).

I'll see if I can post some examples...

[hanfrunz]

ahh okay i see you want frames without motionblur, and detect the motion by using deinterlace-motion-detection-methods. You could use the conditionalfilter() to compare to frames or fields. If the difference is high you have motion if it is low you have less.

[_ck_]

Ah thanks for pointing me in the right direction...

[Mug Funky]

i had a script that would write an image file when it encountered a completely not interlaced frame (this was to reassemble progressive credits from a stupid converted master that disney gave us)

i lost the script, and in your case it'd output tens of thousands of pictures anyway.

but it can be done :)