Planetary Imaging

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15 Νοε 2013 (πριν από 3 χρόνια και 6 μήνες)

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Webcam


Why Planetary Imaging?


Planetary Webcams


Webcam Modification


Taking a Planetary Image


Taking Planetary Video


Processing The Video


Animations



It can be done from every location


It can be done almost all month


During one night changes can be seen


It is easy


It is cheap


It is beautiful



Favorite webcam is the Philips SPC900/880



Other possibilities:


Philips ToUCam series


Microsoft Lifecam


More possibilities can be found at:


http://www.pmdo.com/wwhich.htm


Physical Modifications


Removal of the webcam lens


Attaching a nose piece


Attaching an IR/UV cutoff filter (optional)


SW/Middleware modification


Restore factory defaults


Optimize colors (for dark environment)


Set Color RAW mode


Detail tutorial available here:


http://www.astronomyshed.co.uk/forum/viewtopic.p
hp?f=19&t=2724


You have to be registered to this forum to access


Things to consider:


F length
-

with most webcams the best results will
be achieved at f/25
-
f/30


f = (Telescope F X Barlow)/aperture


Thus recommended barlow for you scope is?


Length of the video


What is the planet rotation period?


How many details are visible on the planet?


How large is the planet in the FoV?


Camera FPS?


Planning


Moons locations


Jupiter moons location calculator


Features location


GRS calculator


Mars emulation


WinJUPOS


FoV simulation


FoV calculator


Getting the planet into the FoV


Start with a larger FoV eyepiece get the planet
centered


Move to a lower eyepiece


re
-
center the planet


Align the red
-
dot or finder scope


Add the barlow to the eyepiece and re
-
center the
planet and align the red
-
dot or finder scope


Switch to the Webcam


Make sure the Webcam exposure and gain are at max


Try to play with the focus till an image comes in to
view

Note
: we are trying to find in the best scenario an object of ~50 arcsec



Focus


Bathinov mask


Creating a Bmask


http://astrojargon.net/MaskGenerator.aspx


Using a BMask


point to a bright star


using the finder scope only


get the 3 lines to meet at a single point


Using the finder scope move back to the planet


Return to the planet using the finder only


Settings (different webcams have different
settings):


Exposure and gain should be:


Gain over 80%


Exposure should be the highest that still shows details
but not burning the image


Gamma should be zero


Trial and error is the best way to learn your
webcam best settings


3 main considerations:


Seeing & transparency


Collimation


Focus


3 tips:


Do focus and then collimation X2


Lower the blue channel to about half the exposure
of the others


Get more than 1500 frames


Capture SW:


Free


SharpCap


FireCapture


wxAstroCapture


License


BackyardEOS


Sample video:


Sample processing:


Processing Steps:


Centering the images or Aligning the frames


Stacking


Wavelets


Post
-
processing


Color alignment


RGB balance


Brightness


Contrast


Gamma


Centering the images or Aligning the frames


Centering the frames will result in a video without
moves where all frames are aligned.


This might result in omitting moons from the FoV


Possible processing tools:


Castrator
or
AutoStakkert

v2.1


PIPP


Registax

(v5.1 or v6.0)



Stacking


Stacking takes all frames and performs statistical
image improvement


Possible processing tools:


AutoStakkert

v2.1


Registax

(v5.1 or v6.0)



Wavelets


Using the statistical information collected during
the stacking to increase the details in the image


Possible processing tools:


Registax

(v5.1 or v6.0)



Post
-
processing


Color alignment


RGB balance


Brightness


Contrast


Gamma


Possible processing tools:


Registax

(v5.1 or v6.0)


GIMP


Image Analyzer


Photoshop (not a freeware)


My way for processing:


Start with PIPP for alignment


Use AutoStakkert for stacking


Then apply wavelets with Registax 6.0


Post processing


Registax


GIMP



Sample:


Sample:


Sample:


Sample:


Sample:


Planning


Mainly using WinJUPOS


Capture large amount of consecutive videos


Process each video as discussed


Combine the results using:


GIMP / Photoshop


Output is GIF


PIPP /
Registax


Output is AVI