Subtract Background - JEOL JSPM-5200 Instructions Manual

６ ANALYSIS OPERATION
6.6.7

Subtract Background...

If the brightness (background) of the image changes in a certain direction, make
correction for this change.
• Whole Plane
Corrects the tilt of the entire image as a single plane.
Clicking OK starts correction.
• Select Plane
Corrects the tilt of a square area specified by the mouse, as a single plane.
Clicking OK starts correction.
• DC Offset
Computes the offset of the brightness of the overall screen, and corrects it.
Clicking OK starts correction.
• Non Linear X
This function corrects the image using a polynomial approximation if the image is
curved in the X direction. Specify the degree of the polynomial equation using
Polynomial Degree. You can specify a degree between 3 and 9.
Clicking OK starts correction.
• Non Linear Y
This function corrects the image using a polynomial approximation if the image is
curved in the Y direction. Specify the degree of the polynomial equation using
Polynomial Degree. You can specify a degree between 3 and 9.
Clicking OK starts correction.
• Line Averaging
This function corrects the following kinds of images by fitting the average value
obtained for each line in the X direction as the average value of the height over the
entire screen.
Clicking OK displays a Threshold bar chart, so specify the height range over which
the average is to be computed, while referring to the preview. Clicking OK in the
bar chart starts correction.
6-32
In almost all cases, there is no need to set Threshold.
Z
Original
Z
Corrected
Threshold
Threshold
TMPM5200-2