I have a video captured from a Video8 tape. A friend of a friend did the capture and whilst I don't know what the cause is, a new transfer isn't currently possible, so I have to work with what I have. The video has a 10px line at the top over the image that is semi-transparant, you can see the video below it.
Most of the time it's purple:
Some times it's green:
Other times it's not there at all.
Is there anything I can do to fix this, rather than just cropping it out and losing those 10 lines? Using AviSynth, video is lossless UT Video.
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Problem with v channel inversion
You can filter the top by cropping, inverting the v channel, stackvertical back onto the original. But you won't find a strip not quite matching from probably from chroma subsampling and some compression artifacts / rounding. You can crop 1px values if you use YV24, but the edge blurring occurred farther in the past. Maybe you can reduce it father buy applying a denoiser through a mask
This is for the image, you would adjust for the video
Code:ImageSource("EIsatm9.png") converttoyv24() a=last a crop(0,0,0,-131,true) a1=last a crop(0,11,0,0,true) a2=last u_chroma = UToY(a1) v_chroma = VToY(a1).invert() YToUV(u_chroma, v_chroma) MergeLuma(a1) a1f=last stackvertical(a1f,a2)
Other times it's not there at all. -
Another way to hide it is to reflect colors from lower in the frame up over the bad colors:
Code:STRIP_HEIGHT = 14 top = Crop(0,0,width,STRIP_HEIGHT) bottom = Crop(0,STRIP_HEIGHT,width,STRIP_HEIGHT).FlipVertical() top = MergeChroma(top, bottom) Overlay(last, top)
Or stretch the chroma from below the bad strip up over the bad strip:
Code:STRIP_HEIGHT = 14 strip = Crop(0,STRIP_HEIGHT,width,STRIP_HEIGHT).BilinearResize(width, STRIP_HEIGHT*2) Overlay(last, strip, mode="chroma")
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[Attachment 45072 - Click to enlarge]
[Attachment 45070 - Click to enlarge]
I believe the top strip has its R and G channels swapped.
But there are other issues (level shifts, gradients) that will make actual repair very difficult.Last edited by raffriff42; 1st Apr 2018 at 08:39.
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