Venera Images, VENERA 13 fully calibrated image Options

[vikingmars]

Here is the Venera 13 fully calibrated image, produced from raw imaging 3-filters data (note the 3 horizons at left well discernible). It was published inside "L'Astronomie Magazine" of Societe Astronomique de France.
Enjoy !

Attached thumbnail(s)

 

[Guest_DonPMitchell_*]

Thanks, it was an afterthought really, but I'm glad I did it. My brain definately sees the terrain better in perspective, even though I am not seeing an new pixels.

I added a little extra info about the project on my blog: Venus in Perspective

[mcaplinger]

I added a little extra info about the project on my blog: Venus in Perspective

Very interesting and well-done. One question: the "channel" in the mid-field of the image on your blog page seems suspiciously aligned with the edges of the image coverage. Is there really reason to think this is anything but an artifact of your processing? I wouldn't want people doing photogeology on the basis of seeing this feature if there isn't real evidence for it.

[Guest_DonPMitchell_*]

Very interesting and well-done. One question: the "channel" in the mid-field of the image on your blog page seems suspiciously aligned with the edges of the image coverage. Is there really reason to think this is anything but an artifact of your processing? I wouldn't want people doing photogeology on the basis of seeing this feature if there isn't real evidence for it.

The persective images are derived from superimposing different projections, with photoshop. I explain that on my latest blog entry. Geologists would not use an image like that to do any kind of analysis. They are just meant to convey the big picture of what the terrain looks like, in a familiar camera perspective. For photo interpretation of geology, you would look at the new unprojected images, with the improved radiometric response function, or even the individual perspective projections, like the three partitial images I show.

Soviet researches, at one time, reprojected the Venera images into the cylindrical form returned by the Viking Mars lander, to help make comparisons in a projection that planetary geologists had become use to studying.

[dilo]

Don, my first attempt to produce vertical/polar projections showed unacceptable distorsion in the lower part, due to the fact that your image isn't an equirectangular projection but is probably closer to a wide-angle image with rectilinear correction (like some processed hazard cam images from MER).
After applying to the original some "pincushion" distorsion and assuming 90 deg FOV, results appear better (vertical projections for V13 and 14 respectively):

Do not know real scale (should be a 0.5cm/pixel assuming a camera height of 1m); someone can calculate based on the probe features...
Here the corresponding pseudo-polars: