Main features | More detailed features |
---|---|
Grey-level histogram | Mean, variance, skewness, kurtosis, percentiles (1, 10, 50, 90, 99%) |
Grey-level co-occurrence matrix (GLCOM) | Angular second moment, contrast, correlation, entropy, sum entropy, sum of squares, sum average, sum variance, inverse difference moment, difference entropy, difference variance (for four directions and five interpixel distances (offsets; n = 1–5)) |
Grey-level run-length matrix (GLRLM) | Run-length non-uniformity, grey-level non-uniformity, long run emphasis, short run emphasis, fraction of image in runs (for four angles) |
Wavelet transform | Energies of wavelet transform coefficients in sub-bands LL, LH, HL, HH |