Video Artifacts

Scene light

A scene begins with physical light rather than pixels. Sources emit spectral radiance; geometry and media determine where it travels; surfaces absorb, reflect, scatter, or emit it; and the viewpoint selects the rays that can enter an imaging system.

Light travels from a source, interacts with a surface, and reaches an imaging viewpointA light source illuminates two points on an object. Reflected rays travel from those points through a viewpoint aperture and cross onto an image plane, illustrating the boundary between scene lighting and projection.LIGHT SOURCEINCIDENT LIGHTSURFACEVIEW / PROJECTION01020304
  1. 01Light sourceSpectrum, radiance, size, and direction describe the emitted light
  2. 02Illumination geometryDistance, orientation, occlusion, and media determine the incident light
  3. 03Surface interactionMaterial and surface geometry absorb, reflect, scatter, or emit light
  4. 04View geometryViewpoint, visibility, and projection determine which rays enter the imaging system