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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 |
FFT Inverse FFT Display Power Spectrum Swap Quadrants Select Largest Square Select Longest Line Autocorrelation Make LEED into FFT Inverse FFT of LEED |
Computes the
inverse Fourier transform. You can filter or mask spots on the
transformed (frequency domain) image and do an inverse transform to
produce an image which only contains the frequencies selected or which
suppresses the frequencies selected. Use NIH Image's editing and selections
tools to draw black or white areas that mask portions of the
transformed image. Black areas (pixel value=255) will pass the
corresponding frequencies and white areas (pixel value=0) will filter
out the corresponding frequencies. It is not, however, possible to both
pass and filter during the same inverse transform.
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Steve Barrett November 2014 |
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