*Build 3D Abstractions with Wireframes DOI: http://dx.doi.org/10.5772/intechopen.96141*

#### **Figure 4.**

{6,9,86,46,49,126} from [22], *S*<sup>8</sup> further add two more images {89,129} to the list, *S*<sup>10</sup> includes {8,10,12,88,90,48,50,52,128,130}, and *S*<sup>12</sup> further adds images {92,132} to the latter. The resulting 3D line sketches from both sides of the house are aligned by using common lines. This completed sketch is finally aligned to the Ground Truth in order to measure the precision. Note that this experiment takes into account just a the variation of the number of images in the dataset [22]. The results show that the method [2] obtains more usable results for a low number of images, and the results of method [1] are only more adequate than method [2] when the number of images gets close to a dozen. The spatial lines are colored attending to its

*Figure from [2]. Quantitative comparison using the sets S*<sup>6</sup> *and S*8*. This figure is better viewed on a screen with a 4x zoom. (a) Sample of the set. (b) and (c) [2] against S*6*, resulting in 175 lines. (d) and (e) Same superposed onto the Ground Truth mesh. (f) Histogram of distances to Ground Truth with [1] method. The maximum distance to be accounted is set to be 0.8, already considered as outlier. (g) Sparse atomic lines returned by [1] method. (h) to (l) [1] against the set S*8*, with 294 segments. (m) and (n) same measurements*

distance to the surface of the Ground Truth mesh.

*for the result by [1]. (o) shows the histogram for this latter result.*

**Figure 3.**

*Applications of Pattern Recognition*

**52**

*Figure from [2]. Quantitative comparison using the sets S*<sup>10</sup> *and S*12*. This figure is better viewed on a screen with a 4x zoom. (a), (b) and (c) [2] against S*10*. The obtained 475 lines have been discretized in points. The distance from each point in the cloud to the surface of the Ground Truth mesh is represented in colors. (d) and (e) Same superposed onto the Ground Truth mesh. (f) Histogram of distances to Ground Truth with the [2] method. The maximum distance to be accounted is set to be 0.8, already considered as outlier. (g) Sparse atomic lines returned by the method [1]. It has been aligned with the Ground Truth mesh. (h) to (l) Same for the method [2] against the set S*12*, with 556 segments. (m) and (n) same measurements for the result by [1]. (o) shows the histogram for this latter result.*
