Mars Perseverance Rover camera calibration targets

Eric Fossum wrote:

Jack Hogan wrote:

fvdbergh2501 wrote:

Jack Hogan wrote:

fvdbergh2501 wrote:

Yep. But I still think that MTF Mapper "lensgrid" chart would work better if you do not obscure it with a tripod leg

Is that the MTF Mapper default chart? Congrats Frans, you are a valiant contributor to the mission!

Yes, the "lensgrid" chart is now the default chart I recommend.

Excellent. Interesting how in the paper they use MTF at Nyquist as a sharpness metric. And they define Nyquist as 0.35 c/p, probably because of the Bayer CFA. This is comparable to what Jim uses at times I believe.

I don't think they use CFA on the Kodak ILT CCD on the Mast-Z cameras. The filters are all on the filter wheel. Not that the ensuing discussion is wrong, just not pertinent to the initial conversation.

The Springer article linked by Frans gives details about the spectral capabilities of the two Mastcam-Z cameras amongst many other details.

it says:

Each camera uses a Kodak KAI-2020 CCD with 1600×1200 active pixels and an 8 position filter wheel that contains an IR-cutoff filter for color imaging through the detectors’ Bayer-pattern filters, a neutral density (ND) solar filter for imaging the sun, and 6 narrow-band geology filters (16 total filters).

Fig 24 gives relative CCD response (I assume: of the bare sensor without the filter wheel) The ND filter would yield approximately this response, There is no empty filter or fully transparent filter on the 8 position wheel. For stereo color photography, the IR cutoff filter (~ 680nm) would be used: Fig 20 with resulting quantum efficiencies curves R0-R ... L0-B.  Stereo view is also possible with the 805nm narrow band filter L1/R1 available on both cameras.

Single camera, narrow spectral band, views can be obtained  by filters L2 ... L6 on the L camera and with R2 ... R6 filters on the R camera: Fig 20.