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Computer graphics meets image fusion : the power of texture baking to simultaneously visualise 3D surface features and colour

Geert Verhoeven (UGent)
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Abstract
Since a few years, structure-from-motion and multi-view stereo pipelines have become omnipresent in the cultural heritage domain. The fact that such Image-Based Modelling (IBM) approaches are capable of providing a photo-realistic texture along the three-dimensional (3D) digital surface geometry is often considered a unique selling point, certainly for those cases that aim for a visually pleasing result. However, this texture can very often also obscure the underlying geometrical details of the surface, making it very hard to assess the morphological features of the digitised artefact or scene. Instead of constantly switching between the textured and untextured version of the 3D surface model, this paper presents a new method to generate a morphology-enhanced colour texture for the 3D polymesh. The presented approach tries to overcome this switching between objects visualisations by fusing the original colour texture data with a specific depiction of the surface normals. Whether applied to the original 3D surface model or a low-resolution derivative, this newly generated texture does not solely convey the colours in a proper way but also enhances the small-and large-scale spatial and morphological features that are hard or impossible to perceive in the original textured model. In addition, the technique is very useful for low-end 3D viewers, since no additional memory and computing capacity are needed to convey relief details properly. Apart from simple visualisation purposes, the textured 3D models are now also better suited for on-surface interpretative mapping and the generation of line drawings.
Keywords
3D surface model, Image-based modelling, Image fusion, Normal map, Surface morphology, Texture baking, SfM, MVS

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Chicago
Verhoeven, Geert. 2017. “Computer Graphics Meets Image Fusion : the Power of Texture Baking to Simultaneously Visualise 3D Surface Features and Colour.” In Isprs Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, IV-2/W2:295–302. ISPRS.
APA
Verhoeven, Geert. (2017). Computer graphics meets image fusion : the power of texture baking to simultaneously visualise 3D surface features and colour. ISPRS ANNALS OF THE PHOTOGRAMMETRY, REMOTE SENSING AND SPATIAL INFORMATION SCIENCES (Vol. IV-2/W2, pp. 295–302). Presented at the 26th International CIPA Symposium – Digital Workflows for Heritage Conservation, ISPRS.
Vancouver
1.
Verhoeven G. Computer graphics meets image fusion : the power of texture baking to simultaneously visualise 3D surface features and colour. ISPRS ANNALS OF THE PHOTOGRAMMETRY, REMOTE SENSING AND SPATIAL INFORMATION SCIENCES. ISPRS; 2017. p. 295–302.
MLA
Verhoeven, Geert. “Computer Graphics Meets Image Fusion : the Power of Texture Baking to Simultaneously Visualise 3D Surface Features and Colour.” Isprs Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. IV-2/W2. ISPRS, 2017. 295–302. Print.
@inproceedings{8530088,
  abstract     = {Since a few years, structure-from-motion and multi-view stereo pipelines have become omnipresent in the cultural heritage domain. The fact that such Image-Based Modelling (IBM) approaches are capable of providing a photo-realistic texture along the three-dimensional (3D) digital surface geometry is often considered a unique selling point, certainly for those cases that aim for a visually pleasing result. However, this texture can very often also obscure the underlying geometrical details of the surface, making it very hard to assess the morphological features of the digitised artefact or scene. Instead of constantly switching between the textured and untextured version of the 3D surface model, this paper presents a new method to generate a morphology-enhanced colour texture for the 3D polymesh. The presented approach tries to overcome this switching between objects visualisations by fusing the original colour texture data with a specific depiction of the surface normals. Whether applied to the original 3D surface model or a low-resolution derivative, this newly generated texture does not solely convey the colours in a proper way but also enhances the small-and large-scale spatial and morphological features that are hard or impossible to perceive in the original textured model. In addition, the technique is very useful for low-end 3D viewers, since no additional memory and computing capacity are needed to convey relief details properly. Apart from simple visualisation purposes, the textured 3D models are now also better suited for on-surface interpretative mapping and the generation of line drawings.},
  author       = {Verhoeven, Geert},
  booktitle    = {ISPRS ANNALS OF THE PHOTOGRAMMETRY, REMOTE SENSING AND SPATIAL INFORMATION SCIENCES},
  issn         = {2194-9050},
  keyword      = {3D surface model,Image-based modelling,Image fusion,Normal map,Surface morphology,Texture baking,SfM,MVS},
  language     = {eng},
  location     = {Ottawa, Canada},
  pages        = {295--302},
  publisher    = {ISPRS},
  title        = {Computer graphics meets image fusion : the power of texture baking to simultaneously visualise 3D surface features and colour},
  url          = {http://dx.doi.org/10.5194/isprs-annals-iv-2-w2-295-2017},
  volume       = {IV-2/W2},
  year         = {2017},
}

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