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46 MicroMAX System User Manual Version 6.C
In addition to intensity-scaling, you also need to be concerned about how the array pixels
map to the video display. The 756×486 resolution of a typical video monitor corresponds
well with the array size of a MicroMAX:782Y, MicroMAX:782YHS or
MicroMAX:512BFT
In the case of a MicroMAX:1300YHS or a MicroMAX:1300YHS-DIF, the number of
array
pixels far exceeds the number of monitor pixels and mapping must be considered
more carefully. The WinX software’s Video Focus mode (accessed from the
Acquisition Menu) provides a Pan function that allows any one of nine different subsets
of the array image to be selected for viewing on the video monitor with only a single-
frame delay. An associated zoom function provides 1x, 2x, or 4x viewing. At 1x, the
entire array image is displayed, but at reduced resolution (pixels are discarded and fine
detail could be lost). At 2x, the mapping is 1:1 and the image portion selected by the Pan
function is provided. The regions overlap, allowing the entire array image to be examined
with no loss of resolution. At 4x, array pixels are enlarged so that a smaller part of the
array image is displayed as selected by the Pan function.
Once proper focus has been achieved, the user can transfer to norm
al data-acquisition
operation. The video output remains operative, but with a more limited and fixed view
because of the resolution limitation of RS-170 video. Although this view is sufficient to
cover the image from a small CCD array in its entirety, it will not cover all the pixels
from a large array. Instead, a subset from the center of the image will be shown. For
example, in the case of the MicroMAX:1300YHS, the monitor would display the
756×486 area from the center of the CCD image as shown in
Figure 16.
1300 × 1030
756 × 486 RS-170
(EIA) monitor
image from center
of CCD image
Figure 16. Monitor Display of CCD Image Center Area
Note: With a 16-bit A/D converter (not a standard option), the composite video output is
disabled during data acquisition.
In post-acquisition processing the WinView/32 ROI (Region of Interest) capability
allows any
portion of an acquired image to be displayed on the computer monitor.
Again, note that the described video output behavior applies specifically
for the
WinView/32 software only. Other application software may provide different video
output capabilities.