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MER Raw Image Naming System
Can anyone shed light on the naming system JPL uses for their raw image filenames? This is what I have figured out on my own: Eg: 2 P 126553081 ESF 0200 P 2100 L6 M1 .JPG 2 = MER-2 (Spirit aka MER-A) P = Pancam 9-digit decimal number = seconds since Jan 1, 2000 so: '126553081' would be 4-Jan-04 17:36. (4 hours slow though ??) ESF/EFF/EDS = ? -- I note EFF is the predominant type; files are larger 4-digit decimal number = ? ('0200' in this case) P = ? 4-digit decimal number = ? ('2100' in this case) L = Left 'eye' 6 = Filter number 6 M1 = ? (I don't think Mer-1, as that is Opportunity) Thanks for any insight. Mark PS Thanks v. much Joe for filter information... "Joe Knapp" wrote in gy.com: .... There is in that collection a series of shots of the color wheel, with file names: http://marsrovers.jpl.nasa.gov/galle...53017ESF0200P2 100L2M1.JPG .... That is a series of three shots, from MER 1 (M1), left camera (L), filters L2, L5 and L6 which is roughly red, green, blue. |
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MER Raw Image Naming System
"mlm" wrote in message ... Can anyone shed light on the naming system JPL uses for their raw image filenames? This is what I have figured out on my own: ... ESF/EFF/EDS = ? -- I note EFF is the predominant type; files are larger Very good reverse engineering! As for the acronyms above, this is a guess, but the rovers can do a few preprocessing steps before compressing the images for transmission: Flat field correction (EFF?): The MER flight software includes the capability to remove the low-frequency flat-field falloff that occurs near the edges of the camera images. This intensity falloff is removed by applying an angularly dependent, cubic correction function to the image data. Subframing (ESF?): When acquiring images, it is often the case where only a specific portion of the image is of interest. For these cases, the flight software allows the option to extract and downlink a subframed region of the image. This subframing option allows full resolution data to be downlinked at a lower data volume than a full image and is expected to be used extensively. The user specifies a choice of hardware and/or software subframing techniques. Image Downsampling (EDN?): All MER images can be spatially downsampled to a user-specified image size using a user-specified hardware or software downsampling technique. The software techniques include nearest neighbor computation of the mean, computation of the mean with outlier rejection, and median averaging. The hardware techniques include the 4 1 binning option described earlier. Image downsampling will be heavily used during the surface mission for both engineering and science purposes due to the significant reduction in downlink volume over a full-size image. The autonomous surface navigation system will rely on the 4 1 hardware binning capability to acquire images in rapid fashion. For example, consider: http://marsrovers.jpl.nasa.gov/galle...0P2302L2M1.JPG red http://marsrovers.jpl.nasa.gov/galle...0P2302L5M1.JPG green http://marsrovers.jpl.nasa.gov/galle...0P2302L6M1.JPG blue That's three photos of the same scene, with the EDN pics being 1:4 the size of the EFF pic. According to a camera document: "The approach for such a panorama will be to acquire red-filter images at full resolution in both eyes, along with green- and blue-filter images at reduced resolution (using compression and/or downsampling) in the left eye." |
#3
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MER Raw Image Naming System
"Joe Knapp" wrote in
gy.com: "mlm" wrote in message ... Can anyone shed light on the naming system JPL uses for their raw image filenames? This is what I have figured out on my own: ... ESF/EFF/EDS = ? -- I note EFF is the predominant type; files are larger For example, consider: http://marsrovers.jpl.nasa.gov/galle...52133EFF0200P2 302L2M1.JPG red http://marsrovers.jpl.nasa.gov/galle...52167EDN0200P2 302L5M1.JPG green http://marsrovers.jpl.nasa.gov/galle...52191EDN0200P2 302L6M1.JPG blue That's three photos of the same scene, with the EDN pics being 1:4 the size of the EFF pic. According to a camera document: "The approach for such a panorama will be to acquire red-filter images at full resolution in both eyes, along with green- and blue-filter images at reduced resolution (using compression and/or downsampling) in the left eye." That makes sense. Maybe JPL will put this info in a FAQ or somewhere on their MER site. Mark |
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