Main functionalities

Image import and export, internal for ppm/pgm, other formats through openCV
Image histogram, normalized histogram, cumulative histogram
Image color space transformations: RGB (sRGB, Adobe RGB), HSV, HSI, Lab, Luv, XYZ
Image transforms: several wavelets, steerable pyramid, Fourier (using FFTW and KISS FFT)
Image convolution using FFT (by FFTW lib)
Deconvolution: Wiener, Richardson-Lucy combined with several regularization schemes
Noise filtering: wavelet shrinkage, non-local means
Contrast enhancement: histogram equalization, Multiscale Retinex
Analysis: Canny edge detector, Steger line detector, watershed, Hough transform, Histogram of Oriented Gradients, Distance transform, Thinning