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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°)