VENERA-10 image processing by Donald Mitchell
10 sent image telemetry for 44.5 minutes, before burning up. It scanned
a 17º section, then 184º and then 63º.
The raw image was converted to optical density according to Russian calibration data, then to linear radiance for image processing. It was interpolated with windowed sinc filter to avoid post-aliasing (a "pixilated" appearance), and the modulation transfer function ("aperture") of the camera was corrected with a 1 + 0.2*frequency**2 emphasis. This was then written out as 8-bit gamma-corrected values, using the sRGB standard gamma of 2.2. Some of the telemetry bars from the long panorama were filled in with image data from the other two sections.
The bottom image is digitally in-painted, using Bertalmio's isophote-flow algorithm, to fill in missing data.
Copyright © 2003 by Donald Mitchell. Reproduced with permission.