Obtaining the Bidirectional Texture Reflectance of Human Skin by means of a Kaleidoscope Jude Radloff Research Project Presentation Supervised by Shaun.

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Presentation transcript:

Obtaining the Bidirectional Texture Reflectance of Human Skin by means of a Kaleidoscope Jude Radloff Research Project Presentation Supervised by Shaun Bangay and Adéle Lobb. Part of the Virtual Reality Special Interests Group (VRSIG). Computer Science Honours – Rhodes University 28 July 2004

Today’s Presentation Objective Background to reflectance measurement Introduction to the Kaleidoscope technique Investigation of various configurations – simulated Practical implementation Next step in research process Questions

Objective : Increased realism of simulated real-world surfaces. Ultimately human skin, being a highly complex surface. Currently focusing on preparation. Bidirectional Texture Function (BTF) describes how INCOMING light is REFLECTED OFF a surface, and how this VARIES over the surface BTF ( θi, Φi, θo, Φo, u, v ) NB light’s interaction with a surface

Han and Perlin, 2003 Proposed a novel technique in measuring reflectance by means of a kaleidoscope Kaleidoscope’s reflective properties allow a sample to be viewed from a variety of directions - without the need for mechanical movement. Potentially: »More economical (time / finance) »More accurate, because of less calibration »Simpler »Easier to use

Kaleidoscope System Setup

Investigation of configurations - by simulation Considerations : Field of View Levels of Reflection Number of Sides Angle of Taper Alternative Configurations –Non-tapered –Additional mirror(s) beneath sample

Taper causes interreflections, which results in a virtual sphere

In a non-tapered configuration, the result is a tiled sample image

Experimental configuration: Tapered cylinder – each level of reflection containing a single distorted image

Recent development : Physical implementation of selected configurations based on our findings in the AFRIGRAPH paper On display today : 3-sided non-tapered kaleidoscope 4-sided tapered kaleidoscope 4-sided tapered kaleidoscope with extended reflective base – this novel configuration is expected to result in an even richer BTF measurement

Next Step… Set up camera and projector as described in the Han and Perlin paper (2003). Build up BTF database of view-illumination pair digital images. VIEW ILLUMINATION

Questions?