# Light field

The light field is a vector function that describes the amount of light flowing in every direction through every point in space. It is a four-dimensional function that includes not only the usual three spatial dimensions, but also the dimension of time. The light field contains all the information that is needed to reconstruct an image of a scene. It includes both the intensity of the light and its polarization.

#### What is 4D light field?

A 4D light field, also known as a plenoptic function, is a mathematical function that describes the distribution of light in three-dimensional space. It is a function of four variables, three spatial variables and one angular variable. The angular variable represents the direction of the light, and the three spatial variables represent the position of the light. The 4D light field can be used to represent the light from a scene in a single image, or it can be used to represent the light from a scene in multiple images.

### What is light field image?

A light field image is a type of image that captures both the intensity and the direction of light in a scene. This allows for a more realistic representation of the scene than what is possible with a traditional 2D image.

Light field images are created by using a light field camera, which is a special type of camera that is equipped with a microlens array. This array of tiny lenses captures light from multiple directions, which is then used to create a 3D image.

Light field images have a number of applications, such as in virtual reality and augmented reality. They can also be used for more traditional photography applications, such as creating images with a shallow depth of field.

### How does a light field work?

A light field is a vector function that describes the light intensity and direction at every point in space. It is typically represented as a 4D function, with the four dimensions being the spatial coordinates x,y,z and the fourth dimension being the light frequency or wavelength.

Light fields are used in many different fields, including computer graphics, vision, and photography. In computer graphics, light fields are used to create realistic images of objects and scenes. In vision, light fields are used to study how the human visual system works. In photography, light fields are used to capture the three-dimensional structure of a scene.

Light fields are typically represented as a 4D function. The four dimensions are the spatial coordinates x,y,z and the fourth dimension is the light frequency or wavelength.

The light field of a point source is a 4D function that describes the light intensity and direction at every point in space. The light field of a point source is a spherical wave. The light field of a point source is a plane wave if the source is infinitely far away.

The light field of a line source is a 4D function that describes the light intensity and direction at every point in space. The light field of a line source is a cylindrical wave.

The light field of a plane source is a 4D function that describes the light intensity and direction at every point in space. The light field of a plane source is a plane wave

### What is 3D light field?

In computer graphics, a light field is a collection of light vectors that can be used to produce an image of a scene. The light field of a scene can be captured using a light field camera, which is a camera that is equipped with a microlens array. The light field of a scene can also be simulated using computer graphics techniques.

Light fields can be used to create images that have a natural look and feel, as well as images that have a more artificial look. In computer graphics, light fields are often used to create images that are realistic, but not necessarily photo-realistic. Who bought Lytro? In 2014, Lytro was bought by Google.