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6.4.4
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NOTICE: Relation between the size of image and the size of cursor box
In case using the CD measurement function on live or frozen SEM images, the size of
image is 1280 x 960 pixels in Full Screen mode and 640 x 480 pixels in Small Screen
mode. The size of pixel itself is the same for both screen modes. The same
parameter set results the same cursor box size for both screen modes.
Measurement is applied to the image displayed on the image screen, even when it is
an image captured with larger image resolution, i.e. 2560 x 1920 pixels.
In the other hand in case using the CD measurement function on the SEM Data
Manager, measurement is applied to the original image, not to the present displayed
image. Using the larger size, i.e. 2560 x 1920 pixels image will results smaller
measurement error caused by pixel size limitation (refer to 6.4.3.4) even the display
size is small, i.e. 640 x 480 pixels.
And it results different size of cursor box on different size of image for the same
parameter set. For example the cursor box size on 2560 x 1920 pixels images is 4
times smaller than that on 640 x 480 pixels images if the same parameter set is used.
It may be reasonable because if the same measurement error caused by pixel size
limitation is expected, the larger image size allows to include wider specimen area
using lower magnification.
But if you prefer to use similar cursor box size for images with different size, it is
recommended to set and register parameter set for each of image size, and select a
parameter set to fit to the present image size under measurement.
The vertical length of box cursor is limited to 480 lines even when using 1280 x 960 or
2560 x 1920 images. It is because too eliminate to result too long processing time
which may caused by too much lines to be calculated.