High frequency flicker in DV at DVinfo.net

Alvise Tedesco · September 30th, 2007, 06:09 PM

Hi all.
Testing DV 25f on XH-A1 vs. my DVXa.
I see a very troublesome flickering on fine straight lines (vertical, horizontal it doesn't matter). Lowering sharpness a lot does reduce it, but then I prefer my DVX, also with his noise on dark areas.
Any suggestion? Coring? H detail? V detail?
I see nobody mention this problem. Is it because it isn't an issue when shooting hdv?
Thanks

Eric Weiss · September 30th, 2007, 06:30 PM

Yes, I find that same issue as well in DV. The A1 is made for HDV.
Shoot in HDV and downconvert to SD for the best results.

Bill Ravens · September 30th, 2007, 09:59 PM

try encoding to a progressive(deinterlaced) output

Simon P Lowe · October 1st, 2007, 05:31 AM

Hello, I think I can help.
This camera does not work at its best when shooting in SD. This is because the lens and imaging sensors are designed for HD pictures, these high frequencies need to be suppressed before down conversion. The camera uses simple inadequate downconversion filtering which you see as aliasing in your picture.
The problem can be resolved by fitting an optical diffuser on the lens. Try a 1/4 Black Promist or similiar.
Simon.

Alvise Tedesco · October 1st, 2007, 06:19 AM

Unfortunately a ProMist isn't effective, I think. I already mounted my M2 adapter and it doesn't solve the problem.
Thanks for answering

September 30th, 2007, 06:09 PM	#1
Alvise Tedesco Regular Crew Join Date: Nov 2005 Location: Milan/Italy Posts: 63	High frequency flicker in DV Hi all. Testing DV 25f on XH-A1 vs. my DVXa. I see a very troublesome flickering on fine straight lines (vertical, horizontal it doesn't matter). Lowering sharpness a lot does reduce it, but then I prefer my DVX, also with his noise on dark areas. Any suggestion? Coring? H detail? V detail? I see nobody mention this problem. Is it because it isn't an issue when shooting hdv? Thanks

September 30th, 2007, 06:30 PM	#2
Eric Weiss Major Player Join Date: Mar 2007 Location: Philly,PA Posts: 360	Yes, I find that same issue as well in DV. The A1 is made for HDV. Shoot in HDV and downconvert to SD for the best results.

September 30th, 2007, 09:59 PM	#3
Bill Ravens Join Date: Nov 2001 Location: santa fe, nm Posts: 3,264 Images: 10	try encoding to a progressive(deinterlaced) output

October 1st, 2007, 05:31 AM	#4
Simon P Lowe New Boot Join Date: May 2005 Posts: 7	Hello, I think I can help. This camera does not work at its best when shooting in SD. This is because the lens and imaging sensors are designed for HD pictures, these high frequencies need to be suppressed before down conversion. The camera uses simple inadequate downconversion filtering which you see as aliasing in your picture. The problem can be resolved by fitting an optical diffuser on the lens. Try a 1/4 Black Promist or similiar. Simon.

October 1st, 2007, 06:19 AM	#5
Alvise Tedesco Regular Crew Join Date: Nov 2005 Location: Milan/Italy Posts: 63	Unfortunately a ProMist isn't effective, I think. I already mounted my M2 adapter and it doesn't solve the problem. Thanks for answering