Applying dehalo on a single snapshot ?

lisztfr9 · 12th April 2014, 11:37

Hi,

I was wondering how to apply Dehalo on a vlc snapshot, so i could create a video but it's cumbersome, i was rather playing with the Gimp.

In the Gimp, edge detection seems not able to extract the high contrast VHS artifacts (halo) from other edges... i need to know how to apply any smoothing to the appropriate region only.

Thanks, L

Edit, for the moment i'm coming up with a technique for smoothing the edges, through an edge mask, never mind. It's the opposite of "smart sharpening."

lisztfr9 · 15th April 2014, 13:42

I tried it with 5, 5 (first parameters, rx, ry)

First, applied anisotropic smoothing (Gimp) to both, then a bit sharpening, and 75% of auto contrast level.

The problem is that halo are difficult to extract, for example it's not always located in high contrast area (right arm of SL). It's related to edges, but if you diminish the edge contrast the whole image get soften.

Anyway the processed image is 3 times lighter than the original...

L

Bloax · 15th April 2014, 14:01

AviSynth does support image sources, or is that not what you're looking for?

Because to apply the dehalo filters for avisynth to an image you'd just do ImageSource("blah") instead of your usual video source filter and then apply the filters as per usual.

12th April 2014, 11:37	#1 \| Link
lisztfr9 Registered User Join Date: Apr 2010 Posts: 175	Applying dehalo on a single snapshot ? Hi, I was wondering how to apply Dehalo on a vlc snapshot, so i could create a video but it's cumbersome, i was rather playing with the Gimp. In the Gimp, edge detection seems not able to extract the high contrast VHS artifacts (halo) from other edges... i need to know how to apply any smoothing to the appropriate region only. Thanks, L Edit, for the moment i'm coming up with a technique for smoothing the edges, through an edge mask, never mind. It's the opposite of "smart sharpening." Last edited by lisztfr9; 12th April 2014 at 14:55.

15th April 2014, 13:42	#2 \| Link
lisztfr9 Registered User Join Date: Apr 2010 Posts: 175	dehaloing has a cost I tried it with 5, 5 (first parameters, rx, ry) First, applied anisotropic smoothing (Gimp) to both, then a bit sharpening, and 75% of auto contrast level. The problem is that halo are difficult to extract, for example it's not always located in high contrast area (right arm of SL). It's related to edges, but if you diminish the edge contrast the whole image get soften. Anyway the processed image is 3 times lighter than the original... L Attached Images

15th April 2014, 14:01	#3 \| Link
Bloax The speed of stupid Join Date: Sep 2011 Posts: 317	AviSynth does support image sources, or is that not what you're looking for? Because to apply the dehalo filters for avisynth to an image you'd just do ImageSource("blah") instead of your usual video source filter and then apply the filters as per usual.