Epsilon photography is a form of

computational photography Computational photography refers to digital image capture and processing techniques that use digital computation instead of optical processes. Computational photography can improve the capabilities of a camera, or introduce features that were no ...

wherein multiple images are captured with slightly varying camera parameters (each image varying the parameter by a small amount ''ε'', hence the name) such as

aperture In optics, the aperture of an optical system (including a system consisting of a single lens) is the hole or opening that primarily limits light propagated through the system. More specifically, the entrance pupil as the front side image o ...

, exposure, focus, film speed and viewpoint for the purpose of enhanced post-capture flexibility. The term was coined by Prof. Ramesh Raskar. The technique has been developed as an alternative to light field photography that requires no specialized equipment. Examples of epsilon photography include focal stack photography,

High dynamic range High dynamic range (HDR), also known as wide dynamic range, extended dynamic range, or expanded dynamic range, is a signal with a higher dynamic range than usual. The term is often used in discussing the dynamic ranges of images, videos, audio o ...

(HDR) photography,

lucky imaging Lucky imaging (also called lucky exposures) is one form of speckle imaging used for astrophotography. Speckle imaging techniques use a high-speed camera with shutter speed, exposure times short enough (100 ms or less) so that the changes in ...

, multi-image

panorama A panorama (formed from Greek language, Greek πᾶν "all" + ὅραμα "view") is any Obtuse angle, wide-angle view or representation of a physical space, whether in painting, drawing, photography (panoramic photography), film, seismic image ...

stitching and confocal stereo. The common thread for all the aforementioned imaging techniques is that multiple images are captured in order to produce a composite image of higher quality, such as richer color information, wider-field of view, more accurate

depth map In 3D computer graphics and computer vision, a depth map is an Digital image, image or Channel (digital image), image channel that contains information relating to the distance of the Computer representation of surfaces, surfaces of scene objec ...

, less noise/blur and greater resolution. Since Epsilon photography at times may require the capture of hundreds of images, recently an alternative called Compressive Epsilon Photography was proposed where one captures only a select few images instead and generates the rest of the images of the stack by making use of prior information about the scene or relationship among the images in the stack. The reconstructed stack of images can be used as before for novel photography applications such as

light field A light field, or lightfield, is a vector-valued function, vector function that describes the amount of light flowing in every direction through every point in a space. The space of all possible ''light rays'' is given by the Five-dimensional space ...

recovery, depth estimation, refocusing and synthetic aperture photography.

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