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Table 5 Image features extracted from lung nodule images

From: Semantic characteristic grading of pulmonary nodules based on deep neural networks

Texture features [30,31,32]

Haralick features calculated from gray-level co-occurrence matrices, such as Autocorrelation, Contrast, Correlation, Cluster Prominence, Cluster Shade, Dissimilarity, Energy, Entropy, Homogeneity, Maximum probability, Sum of squares, Sum average, Sum variance, Sum entropy, Difference variance, Difference entropy and so on

Image entropy

Geometric features

Centroid, MajorAxisLength, MinorAxisLength, Eccentricity, Orientation, ConvexArea, FilledArea, EulerNumber, EquivDiameter, EquivDiameter, Solidity, Extent, Perimeter, PerimeterOld

Hu's invariant moments [33]

Intensity features

mean, variance, skewness