Image Filtering

Convolution and correlation, predefined and custom filters, nonlinear filtering, edge-preserving filters

Functions

imfilter N-D filtering of multidimensional images
normxcorr2 Normalized 2-D cross-correlation
fspecial Create predefined 2-D filter
wiener2 2-D adaptive noise-removal filtering
padarray Pad array
freqz2 2-D frequency response
fsamp2 2-D FIR filter using frequency sampling
ftrans2 2-D FIR filter using frequency transformation
fwind1 2-D FIR filter using 1-D window method
fwind2 2-D FIR filter using 2-D window method
convmtx2 2-D convolution matrix
imguidedfilter Guided filtering of images
nlfilter General sliding-neighborhood operations
medfilt2 2-D median filtering
ordfilt2 2-D order-statistic filtering
stdfilt Local standard deviation of image
rangefilt Local range of image
entropyfilt Local entropy of grayscale image
bwareafilt Extract objects from binary image by size
bwpropfilt Extract objects from binary image using properties

Apps

Image Region Analyzer Explore and filter regions in binary image
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