RAC test compressed panoramic images

Return to Mark Lemmon home page.

Anaglyphs:

The two data sets shown have undergone identical processing except that the second set was processed through the SSI/RAC compresser using 10:1 arithmetic compression. Quality compression should improve the compression ratio at the same overall qulaity due to the compressibility of the sky.

The images were created from 6 quarter-frames for each "eye" and are resampled at 1 mrad / pixel for the larger images. The field of view is about 80 degrees by 26 degrees. The downlink volume for the uncompressed image set is 4.95 Mbits and for the 10:1 compressed set it is 0.50 Mbits (allowing 10% margin for overlap in each case).

A hypothetical pan could be 180 degrees, 2 tiers, stereo, 10:1 (2.2 Mbits) plus 180 degress 1 tier, no stereo, 20:1 compressed (0.3 Mbits) for a total of 2.5 Mbits. [Both stereo and the lower tier are likely to be impractical looking over the lander deck / solar panels.]

Uncompressed (shown as an IDL-compressed (quality=100) JPEG). Click for uncompressed TIFF or click the image for larger format JPEG.

10:1 compressed SSI/RAC JPEG (shown as an IDL-compressed (quality=90) JPEG). Click for uncompressed TIFF or click the image for larger format JPEG.

Single image

Here is a comparison of 5, 10, and 20 to 1 compression on a single image.

Uncompressed

5:1 (RMS error 2.7%)

10:1 (RMS error 4.5%)

20:1 (RMS error 5.9%)

Uncompressed (again)