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GOES-12 launch HDTV video footage
Feb 2002
visualization information
The GOES-12 launch was filmed in HDTV resolution by ???, Dennis got the HDTV videotape which we couldn't play, so Jesse arranged with Smokey (AMNH) to capture the frames and send them back to us.
There was an irritating scratched line that was running through several hundred frames of the footage:
I fixed it with a small IDL program that identified the bad line with an fft along each line (see goes9 noise test) and replaced with interpolation between the nearest lines in the field. The scratch is entirely gone, but unfortunately there remains some defect in the imagery below where the scratched line was that appears to be a spatial offset and/or brightness contrast difference.
Following Mark's After Effects advice, I deinterlaced the sequence. Photoshop also has a deinterlace filter that deinterlaces by discarding either the even or odd lines and interpolating back to full vertical resolution. I compared the output of the Photoshop deinterlace with the output After Effects to try to determine what After Effects was doing.
It turns out that After Effects deinterlaces by taking either the odd or even field and vertically interpolating it back to the interlaced vertical resolution. I tried two different After Effects settings, both imported the sequence as a 30 fps sequnce with 'upper field first' set in the "File > Interpret footage > main" dialog box. For the first setting, I exported the sequence as a 60 fps file sequence. In that case After Effects just assigned the the odd field of the first input frame (with duration = 1/30th sec) to the first frame of the output sequence (with duration = 1/60th sec) and the even field of the first input frame to the second output frame. For the second setting, I exported the sequence as a 30 fps file sequence. After Effects just used the odd fields of the input sequence for that case. Here are examples of the Photoshop and After Effects deinterlace from an area of the image that shows the NOAA seagull logo on the rocket.
original interlaced |
photoshop retain odd lines deinterlace |
after effects 60 fps, frame 0 |
after effects 30 fps |
photoshop retain even lines deinterlace |
after effects 60 fps, frame 1 |
|
Here is a 12MB photoshop file with the even field in one layer and the odd field in another. As expected, since the clouds and rocket are moving but the ground and trees are not, there is no simple offset of the fields that will bring the whole frame into alignment.
I recommend we choose either the odd fields or even fields and discard the others. It doesn't seem this sequence is important enough to spend alot of time correcting.
various resolution quicktimes of the launch:
