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| File Edit Options Process Analyze Video Macros Stacks SEM SPM Windows Help |
Sharpen Shadow Find Edges Rank Filters Dither Convolve PlugIn Filters
Enhance Contrast Equalize Fix Colors Differential Curvature Unsharp Mask Hough Transform |
Does spatial
convolutions using kernels read from a text file or text window.
Kernels can be up to 63 x 63 in size. Output pixel values are clipped
to 8-bits unless Scale Convolutions is checked in the Preferences dialog box. Use NIH Image's built-in text editor to
create or examine these kernels. As an example,
use the New
command to open a blank text window, enter (or paste) the following
kernel, then use the Convolve command to try it out.
This is a 9 x 9 'Mexican hat' filter which will do both smoothing and edge detection in one operation. Each line should be terminated with a carriage return, and the coefficients should be separated by one or more spaces, or a tab. Note that kernels, such as this one, can be opened and displayed as an image using the Import (Text) command. |
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Steve Barrett November 2014 |
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