You can apply a sharpen filter during snapshot acquisition or in the live-image. Use this dialog box to set the parameters for the sharpen filter.
Opening the dialog box
You can open this dialog box via the camera control. In the Camera Control tool window's toolbar, click the Acquisition Settings button. Select the Camera > Sharpness entry in the tree view.
See also
Description of dialog box
Exactly what happens?
You can increase the impression of sharpness in the acquired image during the image acquisition. The unsharp masking filter method is used for this. This is done by initially blurring the source image with a smoothing filter. The blurred image is subtracted from the source image. The difference between the two images contains the biggest intensity differences in the source image, namely edges and lines. The image showing the difference is added to the source image. The resulting image appears sharper and more detailed because the contrast is increased in the edges and lines.
Setting the parameters for the sharpen filter
Select the algorithm that you want to use for smoothing the image from the Sharpness filter list.
If you select the NxN entry, a mean filter is used as a smoothing filter. With an NxN-filter, the intensity values are averaged over a circular image segment.
If you select the Gaussian entry it averages over a circular image segment, like with the NxN-filter. In contrast to the NxN-filter, the pixels are weighted differently during the calculation of the average value. The intensity values of the pixels that are closer to the central pixel, have more weight than the intensity values of the pixels that are further away.
Switching off the sharpen filter
If you select the None entry from the Sharpness filter list, the sharpen filter is switched off for the image acquisition.
Specifying the filter parameters
The Stretch Factor parameter determines how much the edges are emphasized in the resulting image.
The Radius parameter determines the size of the image segment that is used for the smoothing of the image.
The unsharp masking filter method can also amplify image noise. Use the Threshold parameter to reduce this effect. All differences between the source image and the smoothed image that are smaller than the specified threshold value are ignored. This way, big differences in intensity are clearly emphasized in the image and small differences in intensity are not changed.
Sharpness filter in diffraction mode
In Diffraction display mode, the sharpness filter is deactivated by default because a sharpness filter can cause artifacts to appear in the image. Clear the check box if you want to apply the sharpness filter in diffraction mode.
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