hogelongitude

Hogelongitude is a term used in the study of hogel-based representations of light fields. It denotes a scalar angular coordinate that specifies the position around the central optical axis within a single hogel, a small two-dimensional tile that collects a subset of light rays from a scene. In this context, hogel longitude, together with hogel latitude, parametrizes the angular domain sampled by the hogel.

Definition and range: Hogel longitude is typically expressed in degrees or radians. A common convention maps longitude to the interval [-180°, 180°) or [-π, π) radians. It is paired with hogel latitude, which maps the vertical angular direction, and together they index rays within the hogel. Many implementations discretize longitude into a fixed number of samples, forming a grid over the angular domain to guide sampling and reconstruction.

Applications and notes: In light-field rendering and plenoptic photography, hogels organize ray data for efficient storage and computation. Hogel longitude affects how rays are interpolated when reconstructing a view from neighboring hogels, influencing angular resolution and potential aliasing. The term hogel appears primarily in specialized literature and software that implement hogel-based light-field representations.

See also: longitude, latitude, light field, plenoptic camera, hogel.