Perseverance Imagery, technical discussion of processing, cameras, etc. |
Perseverance Imagery, technical discussion of processing, cameras, etc. |
Feb 22 2021, 02:26 AM
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#101
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Member Group: Members Posts: 219 Joined: 14-November 11 From: Washington, DC Member No.: 6237 |
Putting this here, for reference as the payload of the JSON feed link for Perseverence raws (see source in other thread here)
https://mars.nasa.gov/rss/api/?feed=raw_ima...;&extended= Looks like there's a ton of good data in addition to just the (PNG! Bayer color separated!) images This is for the first image shown on the page at the moment. CODE "images": [ { "extended": { "mastAz":"UNK", "mastEl":"UNK", "sclk":"667129493.453", "scaleFactor":"4", "xyz":"(0.0,0.0,0.0)", "subframeRect":"(1,1,1280,960)", "dimension":"(1280,960)" }, "sol":2, "attitude":"(0.415617,-0.00408664,-0.00947025,0.909481)", "image_files": { "medium":"https://mars.nasa.gov/mars2020-raw-images/pub/ods/surface/sol/00002/ids/edr/browse/rcam/RRB_0002_0667129492_604ECM_N0010052AUT_04096_00_2I3J01_800.jpg", "small":"https://mars.nasa.gov/mars2020-raw-images/pub/ods/surface/sol/00002/ids/edr/browse/rcam/RRB_0002_0667129492_604ECM_N0010052AUT_04096_00_2I3J01_320.jpg", "full_res":"https://mars.nasa.gov/mars2020-raw-images/pub/ods/surface/sol/00002/ids/edr/browse/rcam/RRB_0002_0667129492_604ECM_N0010052AUT_04096_00_2I3J01.png", "large":"https://mars.nasa.gov/mars2020-raw-images/pub/ods/surface/sol/00002/ids/edr/browse/rcam/RRB_0002_0667129492_604ECM_N0010052AUT_04096_00_2I3J01_1200.jpg" }, "imageid":"RRB_0002_0667129492_604ECM_N0010052AUT_04096_00_2I3J01", "camera": { "filter_name":"UNK", "camera_vector":"(-0.7838279435884001,0.600143487448691,0.15950407306054173)", "camera_model_component_list":"2.0;0.0;(46.176,2.97867,720.521);(-0.701049,0.00940617,0.713051);(8.39e-06,0.0168764,-0.00743155);(-0.00878744,-0.00869157,-0.00676256);(-1.05782,-0.466472,-0.724517);(-0.702572,0.0113481,0.711523);(-448.981,-528.002,453.359)", "camera_position":"(-1.05782,-0.466472,-0.724517)", "instrument":"REAR_HAZCAM_RIGHT", "camera_model_type":"CAHVORE" }, "caption":"NASA's Mars Perseverance rover acquired this image of the area in back of it using its onboard Rear Right Hazard Avoidance Camera. \n\n This image was acquired on Feb. 21, 2021 (Sol 2) at the local mean solar time of 15:37:11.", "sample_type":"Full", "date_taken_mars":"Sol-00002M15:37:11.985", "credit":"NASA/JPL-Caltech", "date_taken_utc":"2021-02-21T02:16:26Z", "json_link":"https://mars.nasa.gov/rss/api/?feed=raw_images&category=mars2020&feedtype=json&id=RRB_0002_0667129492_604ECM_N0010052AUT_04096_00_2I3J01", "link":"https://mars.nasa.gov/mars2020/multimedia/raw-images/?id=RRB_0002_0667129492_604ECM_N0010052AUT_04096_00_2I3J01", "drive":"52", "title":"Mars Perseverance Sol 2: Rear Right Hazard Avoidance Camera (Hazcam)", "site":1, "date_received":"2021-02-21T23:12:58Z" }, (with syntax color): Here's hoping that one of you skilled characters can make good use... |
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Nov 10 2022, 10:51 PM
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#102
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Senior Member Group: Members Posts: 2520 Joined: 13-September 05 Member No.: 497 |
We have had some inquiries over the years about color calibration for the Mars2020 cameras. For WATSON, the best I can offer is the attached image from the calibration dataset (see https://www.researchgate.net/publication/34...ibration_Report ) This image was taken with 100 msec exposure time, 8-bit linear divide by 8 encoding, and is Bayer-interpolated but otherwise straight out of the camera. It was illuminated by a commercial halogen worklamp (Britek Halo Flood Twin 1200S) with two 500 watt bulbs with a stated color temperature of 3150K. The light source was not calibrated and the geometry was not recorded.
The target is a commercial "Macbeth ColorChecker" ( https://en.wikipedia.org/wiki/ColorChecker ) made by X-Rite and purchased sometime around 2010, I'm guessing. These charts have gone though a variety of manufacturers (they're now made by Calibrite) and I don't know how their colors may have varied; we made no attempt to measure this one. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Nov 19 2022, 07:27 AM
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#103
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Senior Member Group: Members Posts: 2430 Joined: 30-January 13 From: Penang, Malaysia. Member No.: 6853 |
....For WATSON, the best I can offer is the attached image from the calibration dataset (see SHERLOC WATSON Camera Pre-delivery Characterization and Calibration Report... Thanks for that information (from me and others) Were you involved in testing the other cameras such as the NavCams pre launch? If so, is there any publicly available information that you could share (such as released calibration reports / calibration targets used for any of the other M20 cameras) |
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