| Data Set Abstract |
This data set includes sub-sampled versions of Viking Orbiter
images that are intended to facilitate rapid viewing of the image
collection. The image data in these browse images have been
reduced in size by sub-sampling the original image by a factor of
4 in both lines and samples. Thus, the data volume has been
reduced by a factor of 16. A Viking Orbiter browse image contains
264 lines and 300 samples. A filtering procedure was used in
generating the browse images because Viking Orbiter images
commonly contain noisy data or are missing data. The brightness
value of a pixel in a browse image is the median brightness value
of an array of 4 by 4 pixels from the original image. If the 4 by
4 array of original pixels contained zero values, those zero
value pixels were not used in determining the median value. Of
course, if the entire 4 by 4 array contained zero value pixels,
the corresponding pixel in the browse image was assigned a zero
value. |
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