Re: [OT] Mars Rover pictures
Re: [OT] Mars Rover pictures
- Subject: Re: [OT] Mars Rover pictures
- From: email@hidden
- Date: Wed, 21 Jan 2004 14:06:04 EST
In a message dated 1/19/04 11:41:08 PM, email@hidden writes:
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From the PDF above: "Radiometric calibration of both Pancam cameras will be
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performed with an absolute accuracy of 7% or better and a relative precision
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(pixel-to-pixel) of 1% or better."
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>
Does that mean that there is an error of up to 7%? Surely I have that wrong?
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This is in the world of radiometry (1100nm certainly isn't a visible
wavelength), where they would be looking at the raw flux involved... 7% sounds pretty
good to me. The question is whether they intend to subset this data to the
visible spectrum and match it to the CIE curves for human vision emulation.
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>
Secondly "Calibration will be achieved using a combination of preflight
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calibration data and in-flight images of a Pancam calibration target carried
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by the rover. The Pancam calibration target is placed within unobstructed
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view of both camera heads and will be fully illuminated by the Sun between
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at least 10:00 AM and 2:00 PM local solar time for nominal rover
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orientations."
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Surely they need a consistent light source to be able to calibrate a camera
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like this? Can anyone explain this?
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The sun with virtually no atmosphere sounds like a pretty consistant light
source to me...
C David Tobie
Product Technology Manager
ColorVision Inc
email@hidden
www.colorvision.com
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