Illusory gloss on Lambertian surfaces.

Effects of contrast adjustment on visual gloss of natural textures

We propose a novel subband-based S-curve transformation for increasing the perceived contrast of images, and use it to explore the relation between perceived gloss and perceived contrast of natural textures. The proposed transformation makes minimal assumptions on lighting conditions and does not require prior knowledge of surface geometry. Through a series of subjective experiments with both c...

Estimating Surface Reflectance from Images

Motivation: Physical surfaces such as metal, plastic, or paper have different optical qualities that lead to different characteristics in images. Information on the reflectance of a visual surface can be a valuable cue for inferring the properties or identity of a material. Such information is necessary to render a surface realistically in computer graphics and could also allow a vision algorit...

Lambert series and conjugacy classes in GL

A Glossy Simultaneous Contrast: Conjoint Measurements of Gloss and Lightness

Interactions between the albedo and the gloss on a surface are commonplace. Darker surfaces are perceived glossier (contrast gloss) than lighter surfaces and darker backgrounds can enhance perceived lightness of surfaces. We used maximum likelihood conjoint measurements to simultaneously quantify the strength of those effects. We quantified the extent to which albedo can influence perceived glo...

Extracting Shape and Reflectance of Lambertian, Specular, and Hybrid Surfaces

All existing shape extraction techniques that are based on photometric measurements rely on assumed surface reflection properties. We propose a method for determining the shape of surfaces whose reflectance properties may vary from Lambertian to specular without prior knowledge of the relative strengths of the Lambertian and specular components of reflection. The object surface is illuminated u...