Mitsubishi P91DW User Manual download pdf (Page 172)

Chapter 5: Analysis Tools

5-71

Manual Background

Using this option, different region(s) of the image representative of different background

densities can be specified. Further, the user can specify exactly which objects of interest

should correspond to which background objects.

To manually specify the background, use the buttons beneath the BACKGROUND

heading in the Spot Denso toolbox to draw a box (or ellipse or freehand drawing)

around an area representative of background density. If the background varies across an

image, draw several background objects in order to represent each of the various

background levels.

Next, specify the object(s) from which each background density should be subtracted. To

associate a background with an object(s), select the object(s) and the background as

described in Selecting Objects above. When all are selected, click on the LINK

BCKGRD button in the Spot Denso toolbox. All the objects will assume the color of

the background object, indicating that they are associated with each other.

Using Manual Background to Assign Different Background Values to Different Objects:

Objects1-5 are linked to B1; 6-7 to B2; 8-9 to B3

In the Spot Density data window, these objects now show a non-zero background

density value in the BACK column.

To disassociate an object from its background, select the object and click on the UNLINK

BCKGRD button. The object reverts to its original color, indicating that it is no longer

associated with any background box or ellipse. The object's value in the data window

changes and its entry in the BACK column returns to zero.

Note: If AUTO BACKGROUND is active, manual background settings will be

overridden.

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Mitsubishi P91DW User Manual Page 172