Glossary
Searchable terminology from accessibility, web standards, and related fields.
9 results found in Image Processing.
- Deconvolution
- A computational process that reverses the blurring effects of convolution in an optical or imaging system. In the context of visual accessibility, deconvolution is used to pre-process images displayed…
- Image Segmentation (Region Segmentation)
- A computer vision technique that partitions a digital image into multiple distinct regions or segments based on shared characteristics such as color, intensity, or texture. In accessibility applicatio…
- Phase-Based Motion Processing (Phase-Based Video Motion Processing, Phase-Based Motion Magnification)
- A family of computer vision techniques that decompose video frames into complex steerable pyramids and analyse changes in the temporal phase of each scale and orientation to recover motion, including …
- Point Spread Function (PSF)
- A mathematical description of how a single point of light is spread or blurred by an optical system such as the human eye. The point spread function characterizes the degree and pattern of distortion …
- Pre-compensation (Display Pre-compensation, Image Pre-compensation)
- A technique in which images displayed on a computer screen are mathematically modified in advance to counteract the visual aberrations of the viewer's eye. Rather than relying on corrective lenses or …
- Precompensation (Display Precompensation, Image Precompensation)
- A technique in visual accessibility that pre-modifies displayed images in a way that is opposite to the optical distortion introduced by a user's eye, so that the image arriving at the retina more clo…
- Spatiotemporal Saliency (Spatiotemporal Saliency Estimation, Spatio-Temporal Saliency)
- A computer vision technique that estimates, for each pixel in a video, how visually important it is at a given moment by combining spatial contrast (features that stand out within a frame) with tempor…
- Watershed Algorithm (Watershed Segmentation, Watershed Transform)
- An image segmentation technique inspired by geographical hydrology, where the gradient magnitude of an image is treated as a topographical surface. The algorithm simulates water flowing downhill from …
- Zernike Polynomials (Zernike Coefficients, Zernike Modes)
- A set of mathematical functions used to describe the shape of optical wavefronts, commonly employed in ophthalmology and optometry to characterise the optical aberrations of the human eye. Each Zernik…