Directional derivative - A directional derivative measures the instantaneous rate at which a function changes at a point when its input moves in a specified direction.
Dirichlet boundary condition - A Dirichlet boundary condition specifies the value of an unknown function on a selected boundary of a mathematical domain.
Dirichlet distribution - The Dirichlet distribution is a probability distribution over vectors of proportions that sum to one.
Disocclusion - Disocclusion is the process by which a previously hidden part of a scene becomes visible when the viewpoint or scene changes.
Disparity map - A disparity map records the positional differences of corresponding scene points between two images, usually a stereo pair.
Distance map - A distance map is an image or grid in which each location stores its distance to a specified set of locations, such as the nearest background pixel, object...
Distant supervision - Distant supervision creates training signals by connecting unlabeled examples with an external source of information, rather than manually labeling every...
Divergence - In vector calculus, divergence measures the local net outward flow of a vector field per unit volume, or per unit area in two dimensions.
Division model (Fitzgibbon) - The division model associated with Fitzgibbon is a compact mathematical model of radial lens distortion.
Document retrieval - Document retrieval is the process of finding documents that are relevant to a user's information need within a collection.
Domain (spatial) operation - In the supplied computational-photography glossary, a domain (spatial) operation changes where image information is sampled: an output pixel obtains its...
Downhill simplex - Downhill simplex is a derivative-free optimization method commonly referring to the Nelder - Mead algorithm.
Drift (tracking) - Tracking drift is the progressive departure of a visual tracker's estimated target location or representation from the intended target.
Dynamic range - Dynamic range is the ratio between the largest and smallest meaningful signal levels in a specified system or scene.
Edge detection - Edge detection identifies locations in an image where intensity, color, or another image quantity changes in a way associated with a boundary.
Edge-directed interpolation - Edge-directed interpolation estimates missing image samples by adapting to local edge structure.
Edge enhancement - Edge enhancement changes an image to make transitions near edges more pronounced.
Edge-preserving filter - An edge-preserving filter processes an image while trying to avoid blurring important transitions between regions.
Edge-preserving smoothing - Edge-preserving smoothing reduces selected image variations while trying to retain meaningful boundaries between regions.
Edge-spread function - An edge-spread function, or ESF, describes how an imaging system represents a sharp step boundary as a profile of image values across that boundary.
Efros - Leung texture synthesis - Efros - Leung texture synthesis is an example-based method that grows a new texture image one pixel at a time using a supplied texture sample.
Egocentric vision - Egocentric vision studies visual information captured from the perspective of the person or agent performing an activity.
Eigenmoments - Eigenmoments are image descriptors obtained by applying eigenanalysis to a space of geometric image moments.
Electronic image stabilization - Electronic image stabilization reduces unwanted apparent camera motion by digitally adjusting captured images or video frames.
Elliptical weighted average (EWA) - Elliptical weighted average, or EWA, filtering estimates a resampled image or texture value by combining samples within an elliptical footprint using...
Epipolar geometry - Epipolar geometry describes the geometric relationship between two views of a three-dimensional scene taken from different camera positions.
Error level analysis - Error level analysis, or ELA, is an image-inspection technique that visualizes differences between a lossy-compressed image and a recompressed version of it.
Essential matrix - The essential matrix is a three-by-three matrix that represents the epipolar relationship between two calibrated camera views.
Euclidean transformation - A Euclidean transformation preserves distances and angles while changing the position or orientation of a geometric object.
Euler angle - An Euler angle is one of a sequence of angles used to describe a three-dimensional orientation through successive rotations about specified axes.
Eulerian video magnification - Eulerian video magnification is a video-processing technique that makes subtle changes over time easier to see by amplifying selected temporal variations at...
Exemplar inpainting (Criminisi) - Exemplar inpainting, in the Criminisi approach, fills a selected missing or unwanted image region by copying suitable patches from an available source region.
Expand (pyramid operator) - Expand is an image-pyramid operator that maps a smaller image level onto a larger sampling grid, typically doubling each spatial dimension and applying an...
Exposure bracketing - Exposure bracketing is the capture of several images of the same scene using deliberately different exposure settings.
Exposure fusion - Exposure fusion combines differently exposed images of a scene into a single display-oriented image by favoring useful content from each input.
Eye tracking - Eye tracking measures eye position or movement and often estimates where a person is looking over time.
Facial age estimation - Facial age estimation uses an algorithm to predict a person's age or age range from a face image.
Fast marching method - The fast marching method is a numerical technique for computing arrival times of a front that advances monotonically through a domain.
Feature descriptor - A feature descriptor is a numerical representation of selected characteristics of an image, image region or detected feature.
Feed-forward stylization - Feed-forward stylization is the generation of a stylized image by passing an input through a trained model, without running a separate image-optimization...
Feret's diameter - Feret's diameter is a size measurement obtained from the separation of parallel lines that enclose an object's outline, like the jaws of a caliper.
FFT solver - An FFT solver is a numerical solution method that uses the fast Fourier transform to simplify a suitably structured problem.
Fitness function - A fitness function evaluates how well a candidate solution meets the goals of an optimization task.
Flash / no-flash photography - Flash / no-flash photography uses a pair of images of the same scene, one captured with flash and one using ambient light, to support a combined or improved...
Focal stacking - Focal stacking, commonly called focus stacking, combines photographs taken at different focus settings into a composite with a greater range of apparently...
Focus peaking - Focus peaking is a camera or display aid that highlights image edges judged likely to be in focus.
Forensics - Forensics is the systematic examination of evidence to investigate what happened and support justified conclusions.