Shading Correction - Advanced Settings

This dialog box offers additional settings for the offline shading correction. You can open this dialog box from the Shading Correction dialog box. Click the Advanced... button there.

Determining the type of deterioration

In the Assumed deterioration group, select the correction method that is suitable for the shading you want to correct.

Select the Additive option to have the correction image subtracted from the source image.

Select the Multiplicative option to have the source image divided by the correction image.

Setting a calculation method for the shading correction

In the Creation of shading image by group, you set how the correction image is to be calculated.

Calculating a correction image with Polynomial fit

Select the Polynomial fit option to have the correction image calculated from the source image with the help of a two dimensional fit (Least-Square Fit). Determine how the fit is to be calculated. Choose between the Linear, Square and Cubic options. The Cubic option is preset and as a rule, the best for using with a curved surface.

Calculating a correction image with an NxN average filter

Select the NxN average filter option to have the correction image calculated from the source image with an average filter. The source image will then be so washed out, that the actual specimen information will no longer be visible.

In the Iterations field, you enter how often the average filter should be applied.

In the Size field, you set the size of the filter matrix which will be used to filter the source image. The higher these values are, the more the source image will be smoothened.

Closing the dialog box

Click the OK button to close the dialog box, and to return to the image processing dialog box. The parameters that have been set will now be used for the next shading correction.

You can restore the default settings at any time. To do this, click the Default button. Please note that the settings in the Shading Correction - Advanced Settings dialog box will also be reset if you click the Default button in the Shading Correction dialog box.

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