lysfeltteori

Lysfeltteori, often translated as light field theory or scene field theory, is a theoretical framework used in computer graphics and computer vision to represent and reconstruct three-dimensional scenes. It describes a scene as a collection of light rays that pass through every point in space at every possible direction. Essentially, it's a way to capture the entire light information of a scene.

The core idea is to parameterize all light rays. A ray can be defined by its position in 3D space, its direction of travel, and its color or intensity. By sampling these rays across different viewpoints and directions, a comprehensive representation of the scene's illumination and geometry can be built. This can be visualized as a 5D function, where two dimensions represent spatial position and two represent viewing direction, with the fifth dimension being the light intensity.

Lysfeltteori has found applications in various areas. It is fundamental to the concept of plenoptic functions, which are used in integral imaging and light field cameras. These cameras can capture multiple views of a scene simultaneously, enabling effects like refocusing images after capture or creating 3D visualizations. Researchers have also explored its use in rendering complex lighting effects, simulating light transport, and even in understanding the human visual system. While computationally intensive, the theoretical elegance of lysfeltteori provides a powerful way to think about and manipulate light in digital environments.