Manual

June 2004 Isis® Sonar User's Manual, Volume 2 85
Histogram
(area, continued)
Original and Current track four parameters:
#Clrs, Min, Max, and
Bits.
•
#Clrs — These are the number of unique pixel values in
the image.
•
Min and Max — These are the lowest and highest pixel
values found in the image, respectively. See page 83
for a more detailed discussion of min/max.
•
Bits — These are the number of bits of all of the data in
the contact window, logicalled OR'd together and
expressed in hexadecimal notation, that are present in
the image. For example:
0x7FF8 = (0 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0) binary
0x7F80 = (0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0) binary
The most-significant bit is always zero because the data will
always be unsigned. The unused bits, marked with x's above, will
normally be set to zero. When you crop an area of interest in the
Target image to work with in Enhance, histograms pertain just to
the cropped area.
Appendix E: Using the Target Utility