Table 2.

The feature factors that significantly correlated with beauty and roughness ratings and their constituent features.

Judgment	Factor	Features	r	Description
Beauty	4 r2 = 0.22 intensity variation	Mean correlation (d = 8) C_energy2 Roughness Mean correlation (d = 4) C_energy3	0.39 0.40 0.43 0.44 0.33	Mean intensity variation of pixel pairs at a distance of 8 pixels Presence of low spatial frequency content in the texture Tamura roughness, high if both coarseness and contrast are high Mean intensity variation of pixel pairs at a distance of 4 pixels Presence of low spatial frequency content in the texture
	6 r2 = 0.09 Gabor frequency	O2s1 O3s1 O6s1 O5s1 C_energy5	0.11 0.11 0.14 0.15 0.03	Low spatial frequencies from the Gabor domain, with different orientations Presence of low spatial frequency (Fourier) content in the texture
	9 r2 = 0.04 intensity	Avg. texture int. (d = 8) Avg. texture int. (d = 4) Avg. texture int. (d = 2) Avg. texture int. (d = 1) Average intensity	0.18 0.18 0.19 0.20 0.33	Mean over the average texture intensity; i.e., average texture intensity
	13 r2 = 0.21 saturation, intensity	Average saturation Degree of redness Regularity Average intensity R_sumVar	0.45 0.26 −0.07 0.33 −0.39	Range of the weighted sum of the GLCM secondary diagonal entries
	17 r2 = 0.08 directionality	Wedge energy 67.5 Wedge energy 60 Wedge kurtosis Wedge energy 52.5 Wedge energy 70.5	0.26 0.23 0.00 0.11 0.20	Presence of texture elements with orientation 67.5° from vertical Presence of texture elements with orientation 60° from vertical Skewness of the distribution of wedge energy features Presence of texture elements with orientation 52.5° from vertical Presence of texture elements with orientation 70.5° from vertical
Roughness	3 r2 = 0.34 uniformity	Mean angular second moment (d = 2) Mean angular second moment (d = 1) Mean angular second moment (d = 4) Mean angular second moment (d = 8) Mean entropy (d = 2)	−0.44 −0.43 −0.45 −0.45 0.58	Mean over the sum of squared GLCM entries. A measure of uniformity Mean entropy
	9 r2 = 0.13 intensity	Avg. texture int. (d = 8) Avg. texture int. (d = 4) Avg. texture int. (d = 2) Avg. texture int. (d = 1) Average intensity	−0.39 −0.40 −0.40 −0.39 −0.47	Mean over the average texture intensity; i.e., average texture intensity

The first column lists the judgments. The second column lists the number of the feature factor, and a label attached to these factors, based on the most relevant features. The third column lists the features with the highest absolute loadings on each of the relevant feature factors. The fourth column lists the correlation coefficients per feature, to confirm the relevance of these features, and to ascertain the directionality of the relationship to the ratings. The fifth column provides a brief description of the features.