# Deep Learning-Based Imagery Style Evaluation for Cross-Category Industrial Product Forms
## 3 Constructing NTTSSD Paradigms for Imagery Style of Industrial Product Forms
### Quantifying the Imagery Style of Industrial Product Forms Based on Kansei Engineering
#### 3.1.1 Acquisition of Cross-Category Industrial Product Forms
\begin{tabular}{c c c c c c c} \hline \hline \multicolumn{2}{c}{**Number of Surveyed Users**} & \multicolumn{2}{c}{**124 Female**} & \multicolumn{2}{c}{**119 Male**} \\ \hline \multirow{3}{*}{\begin{tabular}{c} **Sample** \\ **Number** \\ \end{tabular} } & \begin{tabular}{c} **The Proportion** \\ **of Naturalness** \\ **(\%)** \\ \end{tabular} & \begin{tabular}{c} **The Proportion** \\ **of Technology** \\ **(\%)** \\ \end{tabular} & \begin{tabular}{c} **The Proportion** \\ **of Toughness** \\ **(\%)** \\ \end{tabular} & \begin{tabular}{c} **The proportion** \\ **of Steadiness** \\ **(\%)** \\ \end{tabular} & \
\begin{tabular}{c} **The Proportion** \\ **of Softness (\%)** \\ \end{tabular} &
\begin{tabular}{c} **The Proportion** \\ **of Dynamism** \\ **(\%)** \\ \end{tabular} \\ \hline
13 & 12.35 & 55.14 & 19.75 & 6.17 & 2.06 & 4.53 \\
14 & 2.88 & 44.44 & 36.63 & 3.29 & 0.41 & 12.35 \\
15 & 4.53 & 62.55 & 12.34 & 8.23 & 1.65 & 10.70 \\
16 & 2.47 & 45.27 & 35.80 & 4.12 & 0.41 & 11.93 \\
17 & 3.70 & 14.40 & 70.78 & 3.70 & 0 & 7.42 \\
18 & 0.82 & 6.59 & 78.19 & 1.23 & 0.82 & 12.35 \\
19 & 2.88 & 18.52 &Constructing the NTTSSD Paradigms for Imagery Style Mapping Across Cross-Category Industrial Products  
In product design, contour line (_l_) is used to describe the overall appearance of the product, combining key shape features such as curves, straight lines, folds, arcs, and slanted lines. It clearly defines the form and structure of the product, and the geometric features of the product can be visually conveyed through the contour line, helping the user to quickly understand its basic form. Another important feature is the edge transition angle (\(\theta\)), which describes the angular characteristics of the product's outer edges. Whether the edges are rounded or sharp directly affects the product's visual impression and functional properties. Visual direction (_d_) emphasizes the product's orientation and clarity in spatial layout. The representation of contour lines (indicated by red lines), edge transition angles (indicated by green lines), and visual directions (indicated by yellow arrows) across six imagery styles in product forms is shown in Figure 5. In the Naturalness style, the contour lines are predominantly composed of freeform curves. Edge transitions featuring large radii with an absence of sharp angles and no clear visual direction are observed. In the Technology style, the contour lines are mainly angular, comprising a mix of straight and curved segments. Edge transitions mostly consist of blunt angles, and a visual direction is present but not strongly emphasized. In the Toughness style, the contour lines are dominated by straight lines, with sharp edge transitions and a clearly defined, though not highly emphasized, visual direction. In the Steadiness style, horizontal and straight contour lines dominate. Edge transitions are characterized by small fillets or rounded corners, and obtuse angles are common. No clear visual direction is present. In the Softness style, contour lines are primarily composed of arcs. Edge transitions feature large radii and smooth curves, with no clear directionality. In the Dynamism style, contour lines combine flowing curves and diagonal lines, where edge angles are freely varied, and a strong visual direction emerges. Additionally, since complex shapes may appear ambiguous in user evaluations, visual curvature (k), an invariant feature for visual recognition of multi-scale images, is classified  
\begin{table}
\begin{tabular}{c} **The Proportion** \\ **of Syotness (\%)** \\ \end{tabular} \\ \hline
26 & 0 & 10.00 & 5.00 & 85.00 & 0 & 0 \\ \hline
27 & 0 & 7.50 & 15.00 & 75.00 & 2.50 & 0 \\ \hline
28 & 60.00 & 17.50 & 0 & 2.50 & 20.00 & 0 \\ \hline
29 & 2.50 & 12.50 & 0 & 82.50 & 2.50 & 0 \\ \hline
30 & 2.50 & 5.00 & 7.50 & 0 & 0 & 85.00 \\ \hline
31 & 12.50 & 10.00 & 12.50 & 0 & 0 & 65.00 \\ \hline
32 & 85.00 & 0 & 2.50 & 0 & 5.00 & 7.50 \\ \hline
33 & 75.00 & 5.00 & 0 & 2.50 & 10.00 & 7.50 \\ \hline
34 & 17.50 & 0 & 0 & 2.50 & 77.50 & 2.50 \\ \hline
35 & 12.50 & 5.00 & 0 & 5.00 & 77.50 & 0 \\ \hline
36 & 17.50 & 7.50 & 0 & 0 & 67.50 & 7.50 \\ \hline
37 & 2.50 & 5.00 & 0 & 72.50 & 20.00 & 0 \\ \hline
38 & 2.50 & 7.50 & 0 & 70.00 & 20.00 & 0 \\ \hline
39 & 10.00 & 77.50 & 7.50 & 0 & 0 & 5.00 \\ \hline
40 & 0 & 5.00 & 80.00 & 15.00 & 0 & 0 \\ \hline \hline \end{tabular}