BRDF Slices: Accurate Adaptive Anisotropic Appearance Acquisition

Filip, Jiřı́; Vávra, Radomír; Haindl, Michal; Id, Pavel; Krupika, Mikula; Havran, Vlastimil

doi:10.1109/cvpr.2013.193

Cited by 33 publications

(50 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Section 7 compares the proposed method with two interpolation methods that work with nearly-uniformly distributed samples, using simulated-and real-measurement scenarios. We also compare our method with a previous adaptive method [2]. Finally, Section 8 discusses advantages and limitations of the method and Section 9 concludes the paper.…”

Section: Introductionmentioning

confidence: 99%

“…[2] which uses slices to capture the main features of 2D subspaces of the BRDF. Values on the slices are measured adaptively to minimize the number required.…”

Section: Related Workmentioning

confidence: 99%

“…To adaptively place samples, we use an enhanced version of the heuristic which was first introduced in Ref. [2].…”

Section: Adaptive Sampling Along the Slicesmentioning

confidence: 99%

“…Sampling the BRDF subspace only along the slices greatly reduces the number of samples needed (see Ref. [2]). Another saving is made by choosing only certain subspaces (e.g., by limiting values of θ i , θ v to multiples of 15…”

Section: Introductionmentioning

confidence: 99%

“…We build upon the method in Ref. [2] which measures the BRDF by one-dimensional slices, but substantially extend its contributions.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Adaptive slices for acquisition of anisotropic BRDF

Vávra

Filip

2018

Comp. Visual Media

View full text Add to dashboard Cite

BRDF continues to be used as a fundamental tool for representing material appearance in computer graphics. In this paper we present a practical adaptive method for acquisition of anisotropic BRDF, based on sparse adaptive measurement of the complete four-dimensional BRDF space by means of one-dimensional slices, which form a sparse fourdimensional structure in the BRDF space, and can be measured by continuous movements of a light source and sensor. Such a sampling approach is advantageous especially for gonioreflectometer-based measurement devices where the mechanical travel of a light source and a sensor imposes a significant time constraint. In order to evaluate our method, we have performed adaptive measurements of three materials and we simulated adaptive measurements of thirteen others. This method has one quarter the reconstruction error of that resulting from regular non-adaptive BRDF measurements using the same number of measured samples. Our method is almost twice as good as a previous adaptive method, and it requires from two to five times fewer samples to achieve the same results as alternative approaches.

show abstract

Section: Introductionmentioning

confidence: 99%

“…[2] which uses slices to capture the main features of 2D subspaces of the BRDF. Values on the slices are measured adaptively to minimize the number required.…”

Section: Related Workmentioning

confidence: 99%

“…To adaptively place samples, we use an enhanced version of the heuristic which was first introduced in Ref. [2].…”

Section: Adaptive Sampling Along the Slicesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…We build upon the method in Ref. [2] which measures the BRDF by one-dimensional slices, but substantially extend its contributions.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Adaptive slices for acquisition of anisotropic BRDF

Vávra

Filip

2018

Comp. Visual Media

View full text Add to dashboard Cite

show abstract

In search of the lost polychromy of English medieval alabaster panels in the Southwest of France

Mounier

Schlicht

Mulliez

et al. 2020

Color Research & Application

View full text Add to dashboard Cite

Summary Polychrome alabaster carvings, representing religious scenes, constitute England's major contribution to European mediaeval sculpture. During the period between 1350 and 1550, large number of alabaster carvings were produced in the Midlands. Despite their massive destruction during the English Reformation (ca.1534), more than 2500 of them still survive, either legally exported or sold clandestinely to the Continent. With more than 100 panels still existing, the Bordeaux region holds one of the largest concentrations of these reliefs. Most of them have unfortunately lost their medieval polychromy, but 20 can still provide valuable information. They are currently studied in our multidisciplinary research program “ALBATRES” (Polychromie, pigments, perception: les albâtres anglais de la fin du Moyen Âge conservés sur le territoire aquitain. Labex LaScArBx project [2018‐2020]). Focused on the panels' polychromy, the project links art history, archaeometry, optical and 3D engineering, and experimental archeology. The first aim is to obtain complete information on the materials and techniques used by medieval painters. The second consists in studying the functions of polychromy and its perception, by determining and interpreting the selection criteria and aesthetic uses of colors and gilding. The polychrome remains of the Aquitaine corpus are studied by means of visual examination, macrophotographic documentation, and noninvasive portable spectroscopic analyses (reflectance spectroscopy by fiber optics in visible and infrared ranges, fluorimetry, etc.). They reveal, among others, the presence of cinnabar, red lead, red ochre, copper green pigments, yellow ochre, gold, lead white, and others. The results allow the production of model samples to help understand the medieval color organization before proposing the coloring of a real copy of one of the studied panels (Virgin's Assumption, Musée d'Aquitaine, Bordeaux). The shape and the appearance of the color rendering could be improved thanks to a special device built at the IOGS to develop a shader that approximates as closely as possible the appearance of the panels. Finally, all information will be integrated on 3D model panels for better appreciation of the carvings and the artistic taste of medieval spectators.

show abstract