How to remove Moire patterns from a video clip?

Question

How to remove Moire patterns from a video clip?

I have a clip of a greetings card that has motion applied so the card rotates slightly as I zoom out. As you can imagine, it's a stunningly dramatic effect! The moire patterning is awful. I tried applying the de-interlacing to that highlighted clip (in the timeline) but it hasn't improved. Any suggestions please? Thanks, Keith

iMac desktop, Mac OS X (10.6.4), learning FCE

Posted on Aug 23, 2010 4:38 PM

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Answer 1

Zak Ray

Level 4

3,469 points

Aug 23, 2010 4:41 PM in response to Keith Worsley-Brown

Are you working in DV? Try changing your sequence settings to AVCHD 1080i60.

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Answer 2

Aug 23, 2010 6:31 PM in response to Zak Ray

Hi Zak, yes I'm in DV. Would I make this change to sequence seetings just for this project?

Please tell me how to change sequence settings. I tried right clicking on the sequence in the Browser and chose "Load sequence presets" but the AVCHD you suggested is not listed as an option. Please advise, thank you. Keith

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Answer 3

Zak Ray

Level 4

3,469 points

Aug 23, 2010 6:35 PM in response to Keith Worsley-Brown

Well it depends on what you're doing. In this case, you're working with photos, so I suggested changing your sequence to HD. If you're working with a DV camera or DV footage, then you would want to stick with the DV preset.

What version of FCE are you running? If you don't have an AVCHD preset, is there an HDV one?

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Answer 4

Aug 23, 2010 7:15 PM in response to Zak Ray

hi Zak. I have FCE 4.0.1, using DV. The only presets are 6 Apple intermediate Codex options, 4 DV NTSC and 4 PAL.

For this project I can live with the moire effect if it's not easy to overcome, but I was curious about dealing with this "interlacing" "staircase" break-up effect in the future. I recall some earlier discussions about this on the forum, but I can't locate the threads using the search options.

Thank you very much for your help.

Keith.

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Answer 5

Zak Ray

Level 4

3,469 points

Aug 23, 2010 7:22 PM in response to Keith Worsley-Brown

The 1920x1080 60i preset is the one you want (thought it was called AVCHD, my bad).

As for deinterlacing, it depends on your output. If you're going to a DVD or TV, leave it as is. If you're going to the web, you can deinterlace.

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Answer 6

Aug 23, 2010 7:57 PM in response to Zak Ray

Thanks Zak. I burn DVDs for my family to play on TV so I've leave as it is, like you said. I appreciate your help. Keith

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Answer 7

theory14

Level 1

15 points

Aug 24, 2010 7:05 PM in response to Keith Worsley-Brown

I had the same type of problem with a number of photos I added to a video. Based on suggestions from this forum, I ended up adding a little bit of anti-aliasing to the photos and the moir went away. This seems initially counterintuitive, but the blurring gets the lines and such in the images to not land right on interlacing lines. The end result is great -- the pictures in the DVD look far better and sharper with the blurring than without.

It was suggested to try the following:
- Channel Blur: Effects -> Video Filters -> Blur -> Channel Blur
- Anti-Alias: Effects -> Video Filters -> Stylize -> Anti-Alias

Play with each of this and different amounts of blur to see what works best for your particular case.

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Answer 8

Aug 24, 2010 8:30 PM in response to theory14

Thanks for this suggestion. I think I remember reading about that before and, as you say, it seems strange but is certainly worth a try. I appreciate your contribution to this. Keith

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