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Table 1 Features extracted from the US images

From: Beef quality parameters estimation using ultrasound and color images

Gradient
- mean µ*
- std deviation σ*
Co-occurrence matrix
- correlation*
- homogeneity*
- contrast*
- energy*
Gray Level
- mean
- contrast ratio
Histogram
- percentile (each 20%)
- skewness
Fourier transform
- variance coefficient
- power percentile (× 5)
Local Binary Pattern (LBP)
- correlation
- homogeneity
- contrast
- energy
  1. Features marked with * were computed in four directions given by angles (45°,90°,135°,180°)