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Venera Images, VENERA 13 fully calibrated image
vikingmars
post Sep 14 2005, 09:26 PM
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biggrin.gif 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 !
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Guest_DonPMitchell_*
post Sep 12 2006, 01:28 AM
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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
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mcaplinger
post Sep 12 2006, 04:40 AM
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QUOTE (DonPMitchell @ Sep 11 2006, 06:28 PM) *
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.


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Disclaimer: This post is based on public information only. Any opinions are my own.
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Guest_DonPMitchell_*
post Sep 12 2006, 06:26 AM
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QUOTE (mcaplinger @ Sep 11 2006, 09:40 PM) *
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.
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dilo
post Sep 12 2006, 11:01 AM
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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):
Attached Image
Attached Image

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:
Attached Image
Attached Image


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Guest_DonPMitchell_*
post Sep 12 2006, 11:42 AM
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The images were originally 800 x 600, and the sky was later extended by 200 pixels. So the camera is perspective projection, but it is pointing downward a little. Just delete the upper 200 pixels and try. Here is the code that made the image:

CODE
//
//  Take a picture with a perspective camera
//
#define NWIDE 800
#define NHIGH 600

static void
Camera(double fTheta, double fPhi, char *sz)
{
    ML_Vector3 v;
    double x, y, z;
    ML_Image im;
    ML_Matrix3x3 matTilt;
    int i, j;

    im.NewImage(NWIDE, NHIGH, 1);
    matTilt = ML_EulerMatrix(fPhi*D_DTR, 0.0, fTheta*D_DTR, "xyz");
    y = 0.45 * double(NWIDE);
    for (i = 0; i < NWIDE; i++) {
        x = double(i - NWIDE/2) + 0.5;
        for (j = 0; j < NHIGH; j++) {
            z = -double(j - NHIGH/2) - 0.5;
            v = ML_Vector3(x, y, z);
            v = matTilt * v;
            v = s_matCamera * v;
            im.Set(SampleVector(v), i, j);
        }
    }
    im.WriteBMP(sz);
}
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Posts in this topic
- vikingmars   Venera Images   Sep 14 2005, 09:26 PM
- - Decepticon   Wow! Nice work.   Sep 14 2005, 09:31 PM
- - um3k   Very nice!   Sep 14 2005, 10:07 PM
- - hal_9000   WoW!   Sep 14 2005, 10:25 PM
- - gpurcell   QUOTE (vikingmars @ Sep 14 2005, 09:26 PM) He...   Sep 14 2005, 10:36 PM
- - tedstryk   QUOTE (vikingmars @ Sep 14 2005, 09:26 PM) He...   Sep 15 2005, 12:18 AM
- - vikingmars   Dear Tedstryk, Yes, indeed, I had to reconstruct s...   Sep 15 2005, 07:18 AM
|- - tedstryk   QUOTE (vikingmars @ Sep 15 2005, 07:18 AM) De...   Sep 15 2005, 02:31 PM
|- - tedstryk   I have updated one of my mosaics from Venera 13. ...   Sep 19 2005, 05:17 PM
- - Decepticon   Now thats cool!   Sep 19 2005, 09:45 PM
- - GregM   .   Sep 24 2005, 03:39 AM
- - Decepticon   tedstryk I was wondering if you have ever edited t...   Sep 24 2005, 05:05 AM
|- - tedstryk   QUOTE (Decepticon @ Sep 24 2005, 05:05 AM)ted...   Sep 24 2005, 12:33 PM
||- - Bob Shaw   QUOTE (tedstryk @ Sep 24 2005, 01:33 PM)Other...   Sep 24 2005, 02:48 PM
||- - dvandorn   QUOTE (Bob Shaw @ Sep 24 2005, 09:48 AM)...Su...   Sep 24 2005, 04:02 PM
||- - djellison   QUOTE (dvandorn @ Sep 24 2005, 04:02 PM)There...   Sep 24 2005, 04:05 PM
||- - Bob Shaw   QUOTE (djellison @ Sep 24 2005, 05:05 PM)I...   Sep 24 2005, 05:09 PM
|- - JRehling   QUOTE (Decepticon @ Sep 23 2005, 10:05 PM)ted...   Sep 24 2005, 04:39 PM
- - vikingmars   Looking again closely at the Venera 13 camera 1 ra...   Oct 4 2005, 08:00 PM
|- - ljk4-1   QUOTE (vikingmars @ Oct 4 2005, 03:00 PM) Loo...   Oct 4 2005, 08:29 PM
|- - Bob Shaw   QUOTE (vikingmars @ Oct 4 2005, 09:00 PM)And ...   Oct 4 2005, 10:50 PM
- - vikingmars   ...and I forgot to show you how the camera 1 pan l...   Oct 4 2005, 08:21 PM
- - vikingmars   Well ljk4-1... I don't know about the "Ve...   Oct 4 2005, 08:50 PM
|- - tedstryk   QUOTE (vikingmars @ Oct 4 2005, 08:50 PM) Wel...   Oct 4 2005, 08:59 PM
|- - ljk4-1   QUOTE (vikingmars @ Oct 4 2005, 03:50 PM) Wel...   Oct 4 2005, 09:03 PM
|- - tedstryk   QUOTE (ljk4-1 @ Oct 4 2005, 09:03 PM)I a...   Oct 4 2005, 10:21 PM
|- - JRehling   QUOTE (tedstryk @ Oct 4 2005, 03:21 PM)It als...   Oct 4 2005, 10:41 PM
|- - Bob Shaw   QUOTE (JRehling @ Oct 4 2005, 11:41 PM)My bet...   Oct 4 2005, 10:53 PM
|- - RNeuhaus   QUOTE (Bob Shaw @ Oct 4 2005, 05:53 PM)Well, ...   Oct 5 2005, 04:04 PM
|- - JRehling   QUOTE (RNeuhaus @ Oct 5 2005, 09:04 AM)The Ve...   Oct 5 2005, 04:42 PM
- - ilbasso   Wasn't there also the thought that there is su...   Oct 5 2005, 09:02 PM
- - RNeuhaus   How does the Venus has some kind of rain when the ...   Oct 5 2005, 09:11 PM
|- - tedstryk   QUOTE (RNeuhaus @ Oct 5 2005, 09:11 PM)How do...   Oct 5 2005, 09:13 PM
|- - helvick   QUOTE (tedstryk @ Oct 5 2005, 10:13 PM)There ...   Oct 5 2005, 09:49 PM
- - vikingmars   (following item #19) http://www.unmannedspaceflig...   Oct 8 2005, 05:08 PM
|- - RNeuhaus   QUOTE (vikingmars @ Oct 8 2005, 12:08 PM)(fol...   Oct 8 2005, 05:45 PM
|- - Bob Shaw   Lovely image! Bob Shaw   Oct 8 2005, 06:10 PM
- - ilbasso   Absolutely breathtaking! I'm amazed at th...   Oct 9 2005, 02:07 AM
- - BruceMoomaw   QUOTE (tedstryk @ Oct 5 2005, 09:13 PM)There ...   Oct 9 2005, 05:58 AM
- - RNeuhaus   I have found useful information about the Venera...   Oct 11 2005, 10:18 PM
- - vikingmars   (Thanks to all for your great contributions about ...   Oct 22 2005, 12:20 PM
|- - tedstryk   Here is an attempt to do similar processing with a...   Jan 8 2006, 03:28 AM
- - PhilCo126   Superb work on those 1982 Venera color panoramas...   Jan 8 2006, 04:02 PM
|- - tedstryk   QUOTE (PhilCo126 @ Jan 8 2006, 04:02 PM)Super...   Jan 9 2006, 02:33 PM
- - RNeuhaus   Very different type of terrain. Mainly rocky, no s...   Jan 9 2006, 03:08 PM
|- - JRehling   QUOTE (RNeuhaus @ Jan 9 2006, 07:08 AM)Very d...   Jan 9 2006, 08:29 PM
|- - tedstryk   QUOTE (JRehling @ Jan 9 2006, 08:29 PM)While ...   Jan 9 2006, 08:34 PM
|- - Bob Shaw   QUOTE (tedstryk @ Jan 9 2006, 09:34 PM)I have...   Jan 9 2006, 11:10 PM
|- - tedstryk   QUOTE (Bob Shaw @ Jan 9 2006, 11:10 PM)Or eve...   Jan 9 2006, 11:12 PM
|- - Bob Shaw   QUOTE (tedstryk @ Jan 10 2006, 12:12 AM)I thi...   Jan 9 2006, 11:24 PM
||- - tedstryk   Here is a Venera 14 compilation. I can't get ...   Jan 10 2006, 02:43 AM
|- - JRehling   QUOTE (tedstryk @ Jan 9 2006, 03:12 PM)I thin...   Jan 10 2006, 03:04 AM
|- - tedstryk   QUOTE (JRehling @ Jan 10 2006, 03:04 AM)Vener...   Jan 10 2006, 03:16 AM
|- - tedstryk   Here is the completed version of that set. Becaus...   Jan 10 2006, 05:02 AM
- - RNeuhaus   I think that the dust is the product of desintegra...   Jan 9 2006, 09:22 PM
|- - JRehling   QUOTE (RNeuhaus @ Jan 9 2006, 01:22 PM)So, Ve...   Jan 9 2006, 10:14 PM
|- - RNeuhaus   QUOTE (JRehling @ Jan 9 2006, 05:14 PM)I...   Jan 10 2006, 04:24 PM
|- - ljk4-1   QUOTE (RNeuhaus @ Jan 10 2006, 11:24 AM)You a...   Jan 10 2006, 04:26 PM
|- - RNeuhaus   QUOTE (ljk4-1 @ Jan 10 2006, 11:26 AM)I ...   Jan 10 2006, 04:57 PM
|- - RNeuhaus   QUOTE (RNeuhaus @ Jan 10 2006, 11:57 AM)Why s...   Jan 10 2006, 07:30 PM
|- - tedstryk   Here are two more shots. An improved horizon pan:...   Jan 11 2006, 02:49 PM
|- - paxdan   Looks to me that if you flipped the rock over it m...   Jan 11 2006, 04:02 PM
|- - tedstryk   QUOTE (paxdan @ Jan 11 2006, 04:02 PM)Looks t...   Jan 11 2006, 04:35 PM
- - BruceMoomaw   The consensus now is that what we're seeing in...   Jan 10 2006, 03:01 AM
- - tasp   { I hope I phrase this well enough } Does any one...   Jan 10 2006, 06:30 PM
|- - JRehling   QUOTE (tasp @ Jan 10 2006, 10:30 AM){ I hope ...   Jan 10 2006, 06:50 PM
|- - Michael Capobianco   Does anyone else remember the "fact" tha...   Jan 11 2006, 05:00 PM
- - Toma B   I heard about refraction in Venusian atmosphere......   Jan 11 2006, 05:13 PM
|- - tedstryk   QUOTE (Toma B @ Jan 11 2006, 05:13 PM)I heard...   Jan 11 2006, 05:41 PM
|- - helvick   QUOTE (Toma B @ Jan 11 2006, 06:13 PM)I heard...   Jan 11 2006, 06:43 PM
|- - JRehling   QUOTE (helvick @ Jan 11 2006, 10:43 AM)All in...   Jan 11 2006, 07:06 PM
|- - ljk4-1   Don Dixon made some paintings of the alleged super...   Jan 11 2006, 07:20 PM
|- - Toma B   QUOTE (ljk4-1 @ Jan 11 2006, 10:20 PM)Do...   Jan 11 2006, 07:27 PM
|- - ljk4-1   QUOTE (Toma B @ Jan 11 2006, 02:27 PM)...but ...   Jan 11 2006, 07:29 PM
- - BruceMoomaw   Yes, the first shots of Venus from Venera 9 and 10...   Jan 12 2006, 01:47 AM
|- - ljk4-1   QUOTE (BruceMoomaw @ Jan 11 2006, 08:47 PM)Ye...   Jan 12 2006, 05:53 PM
|- - ljk4-1   Soviet Veneras and Mars: first entry probes trajec...   Jan 23 2006, 05:08 PM
|- - tedstryk   Great find! I had seen the Mars 6 stuff in an...   Jan 23 2006, 06:07 PM
- - ljk4-1   Found this Soviet document from 1969 on their Vene...   Jun 3 2006, 08:34 PM
|- - DonPMitchell   QUOTE (ljk4-1 @ Jun 3 2006, 01:34 PM...   Jun 4 2006, 03:13 AM
- - Rakhir   Don, your images are amazing ! Old Soviet...   Sep 11 2006, 04:15 PM
|- - dilo   To many things are happening today... These Vene...   Sep 11 2006, 07:23 PM
- - Stu   Congratulations on being featured on SPACE.com Don...   Sep 11 2006, 10:10 PM
|- - climber   QUOTE (Stu @ Sep 12 2006, 12:10 AM) The o...   Sep 11 2006, 11:17 PM
|- - tedstryk   Congratulations! It is great to see the image...   Sep 11 2006, 11:52 PM
- - DonPMitchell   Thanks guys. NBC picked up the story too (MSNBC)....   Sep 11 2006, 11:58 PM
|- - DFinfrock   Don, Those old Venera images were always apprecia...   Sep 12 2006, 01:03 AM
- - DonPMitchell   Thanks, it was an afterthought really, but I'm...   Sep 12 2006, 01:28 AM
|- - mcaplinger   QUOTE (DonPMitchell @ Sep 11 2006, 06:28 ...   Sep 12 2006, 04:40 AM
|- - DonPMitchell   QUOTE (mcaplinger @ Sep 11 2006, 09:40 PM...   Sep 12 2006, 06:26 AM
|- - AndyG   Well done, Don. You've managed to make me bea...   Sep 12 2006, 08:40 AM
|- - dilo   Don, my first attempt to produce vertical/polar pr...   Sep 12 2006, 11:01 AM
||- - DonPMitchell   The images were originally 800 x 600, and the sky ...   Sep 12 2006, 11:42 AM
|- - mcaplinger   QUOTE (DonPMitchell @ Sep 11 2006, 11:26 ...   Sep 12 2006, 01:57 PM
|- - DonPMitchell   QUOTE (mcaplinger @ Sep 12 2006, 06:57 AM...   Sep 12 2006, 03:56 PM
- - dvandorn   Yes, thanks, Don! In particular, the "hi...   Sep 12 2006, 02:26 AM
- - RNeuhaus   I was delighted to see Don's Pictures. I could...   Sep 12 2006, 03:01 AM
|- - mars loon   Don, beautiful work. fantastic hills. I will now...   Sep 12 2006, 12:15 PM
- - Myran   You're in the news mr DonPMitchell.   Sep 12 2006, 05:36 PM
- - Tayfun Öner   A quicktime VR would be nice.   Sep 12 2006, 06:21 PM
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