Selective surface normal estimation for volume rendering

CELEBI O. C., ÇEVİK U.

INTELLIGENT AUTOMATION AND SOFT COMPUTING, cilt.23, sa.1, ss.95-102, 2017 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 23 Sayı: 1
  • Basım Tarihi: 2017
  • Doi Numarası: 10.1080/10798587.2016.1139260
  • Dergi Adı: INTELLIGENT AUTOMATION AND SOFT COMPUTING
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.95-102
  • Anahtar Kelimeler: Volume rendering, surface smoothing, normal estimation, staircase effect, VISUALIZATION, DISPLAY, CT
  • Çukurova Üniversitesi Adresli: Evet

Özet

Three-dimensional volumetric data is discrete by nature. It does not preserve continuous surface. Therefore, to render surfaces realistically, the normal vectors must be predicted before processing the image. During the rendering, if the normals are averaged directly, then the sharp edges are smoothed out as well. In this paper, we show how to avoid over-smoothing problems by analyzing a few neighbor voxels, and selectively averaging the normals to keep details, within a predefined kernel.