A light field is the information about light that is required to record, store and recreate a hologram.
Light Field vs Images Traditional videos and images only record information about light intensity or chromacity. A light field records the direction that the light rays are traveling in space along with their intensity.
7DAn ideal light field recording includes 7 parameters known as dimensions. The image is taken from a large number of positions that completely surround the scene in the light field. Each position is recorded in 3D space as a viewing position (Vx, Vy, Vz). Images are captured from each position from a variety of viewing directions recorded as (θ, φ). Time and light intensity are recorded as (t,λ). The hologram is thus captured in 7D as (Vx, Vy, Vz, θ, φ,t,λ).
Plenoptic FunctionThe five dimensions related to viewing position (Vx, Vy, Vz) and viewing direction (θ, φ) are parameters to an equation known as a 5D Plenoptic Function.
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