Parallel Pencil Drawing Stylization via Structure-Aware Optimization

SRNPD: Spatial rendering network for pencil drawing stylization

“…The comparison to closely related methods. The first row is the comparison with the work of Lu et al, the second row is the comparison with the work of Chen et al, and the third row shows the comparison with the work of Zhang et al…”

“…The second row of Figure shows the comparison with the work of Chen et al Since their method spent too many efforts on underline structure maintaining, their method preserves too much structure that it will destroy the geometry information of the original image (see the part marked by a red rectangle in Figure e). On the other hand, the proposed method successfully handled this question, which can be seen from the zoomed‐in part marked by a red rectangle in Figure f.…”

“…The first row is the comparison with the work of Lu et al, 7 the second row is the comparison with the work of Chen et al, 8 and the third row shows the comparison with the work of Zhang et al 5 pencil drawing result; however, they cannot well illustrate the geometry information of the original image. We can see that the wrinkles in the red hat worn by the old lady are lost in the result of Lu et al 7 in Figure 7b, whereas the result of the proposed method shown in Figure 7c well preserves these wrinkles, which makes it look more realistic than the result of Lu et al 7 The second row of Figure 7 shows the comparison with the work of Chen et al 8 Since their method spent too many efforts on underline structure maintaining, their method preserves too much structure that it will destroy the geometry information of the original image (see the part marked by a red rectangle in Figure 7e). On the other hand, the proposed method successfully handled this question, which can be seen from the zoomed-in part marked by a red rectangle in Figure 7f.…”

“…Way et al generated a colored pencil with some novel non‐photorealistic rendering methods based on analyzing an artist's actual drawing process and calculated a global colored pencil stroke orientation with radial basis functions. Chen et al focused on how to maintain the underline structure of the input image while converting it into the pencil drawing style.…”

“…A good pencil drawing has to vividly exhibit the inner structure of a scene that cannot be achieved by common existing methods . In addition, the current pencil drawing of an artist usually looks real, which requires that a pencil drawing generation method has to generate a realistic pencil drawing result; however, the current pencil drawing stylization methods cannot realize it. Pencil drawing artists usually first draw some main coarse strokes to depict the main composition of the drawing and then gradually add smaller strokes to further refine the contours.…”