[X] My Assistant

[jamescanvin]

A preview of the Duck Bay panorama.

Nice job - this is hand coloured, right?

I don't think so. It looks like James assembled this one from the tracking site thumbnails.

I'm glad to have that preview btw James. I look forward to the official release next Friday..

Nico

but from the lens geometry it does look like a colorized sol952 navcam panorama
Very good job on the colorization. kudos, James !

I'd say the opposite Bernhard, Navcam needs less frames to cover that area...

Nico

I see - he took the navcam pan as the red channel (it's response is dominated by IR/red, and resolution will be much sharper than L2 thumbs). Then he used the L7's and L5's that are down and the L7 and L5 thumbs for the remaining areas, scaled to navcam resolution.

I assume he blacked out portions of the navcam that are not covered by L5/7 - that's why we see 16 degree blocks.

Is that it, James?

Your all on the right track but not quite there.

To make this I took the thumbnails (64x64 each) from the tracking site and used the tracking data to create a Hugin pan file. (Note the rover quaternian appears a little off in the database at the moment so the horizon isn't flat.)

Then I ran my normal image matching / colouring software on the pan/images to create a full colour mini panorama.



This however has a much lower resolution than the existing navcams, so the next step is to use the pan as a colour layer over the navcam pan (also made using the tracking data so the two match in geometry.)

Then as Fred says, I cut out (poorly, must try harder next time.) just the coloured region from the navcam pan to retain the 'feel' of a pancam pan.



The good news is most of this happens automatically in my software, so you can all expect prompt 'preview' panoramas in the future before the full images are even downlinked from the rover.

James

[fredk]

Very nice, James. So do I understand correctly that you take the luminance values from the navcam pan, and the hue and saturation values from the scaled up thumbnail pan?

Do you think it would be any improvement to instead do as I originally wrote, namely taking navcam as the red channel, L5 thumbs as green and L7 thumbs as blue (or whatever combination you prefer)? I'm just thinking that these pans are always dominated by the red channel, of course, so could this approach improve the "colour resolution"? Or would this be equivalent to what you're doing?

What's interesting is that if you just tried to superimpose a set of pancams onto a navcam, I think you'd have trouble getting the alignment right since the navcams contain considerable geometrical distortion. Is this accounted for in your approach in generating the projected navcam pan? Or is it negligible at the resolution of the thumbnails anyway? I suppose Michael Howard has sorted all this out with his pancam/navcam combos.

[jamescanvin]

Very nice, James. So do I understand correctly that you take the luminance values from the navcam pan, and the hue and saturation values from the scaled up thumbnail pan?

That's right, similar to what other have done colouring MI's using pancam images.

Do you think it would be any improvement to instead do as I originally wrote, namely taking navcam as the red channel, L5 thumbs as green and L7 thumbs as blue (or whatever combination you prefer)? I'm just thinking that these pans are always dominated by the red channel, of course, so could this approach improve the "colour resolution"? Or would this be equivalent to what you're doing?

I don't think that really improves things, your not really gaining any colour resolution as the green and blue channels that make the colour are still at the lower resolution. And you end up effectively loosing spacial resolution as now two channels containing the low resolution data dominate over the higher red channel.

Another issue is simplicity for me. I have some quite sophisicated routines that i've developed over the last year for making nice colour pans that work on individual pancam pointings (plus knowledge of how they fit together) not on the whole pan. So just adding the green and blue to a red navcam results in some serious colour gradients.

Here is a simple attempt at this showing the problems,

What's interesting is that if you just tried to superimpose a set of pancams onto a navcam, I think you'd have trouble getting the alignment right since the navcams contain considerable geometrical distortion. Is this accounted for in your approach in generating the projected navcam pan? Or is it negligible at the resolution of the thumbnails anyway? I suppose Michael Howard has sorted all this out with his pancam/navcam combos.

The navcams arn't that bad. I didn't take any into account doing this.

I think the biggest problem is that the navcam isn't in the same position as the pancam so at close range you end up with a small stereo effect. It's more evident in the 'navcams in red channel' attempt in this post (another problem with it!), in fact that image may work as an anaglyph! (Probably the wrong way around, left pancam is to the left of the left navcam so the pancams should be red (i think), you'll have to turn the glasses around. I don't have my glasses to check)

EDIT: Cross post with Mike - glad we agree

James