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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 or radio .
Audio engineers use dynamic range to describe the ratio of the amplitude of the loudest possible undistorted signal to the noise floor, say of a microphone or loudspeaker. [18] Dynamic range is therefore the signal-to-noise ratio (SNR) for the case where the signal is the loudest possible for the system. For example, if the ceiling of a device ...
Dynamic range is a significant factor in the quality of both the digital and emulsion images. Both film and digital [dubious – discuss] sensors exhibit non-linear responses to the amount of light, and at the edges of the dynamic range, close to underexposure and overexposure the media will exhibit particularly non-linear responses. The non ...
Tone mapped high-dynamic-range (HDR) image of St. Kentigern's Church in Blackpool, Lancashire, England. In photography and videography, multi-exposure HDR capture is a technique that creates high dynamic range (HDR) images (or extended dynamic range images) by taking and combining multiple exposures of the same subject matter at different exposures.
In radiography, exposure latitude and dynamic range are equivalent. [2] [3] It is the range of exposures that can be recorded as useful densities on a radiographic film for interpretation. [4] In film-screen radiography, exposure latitude range from 10:1 to 100:1. In digital chest radiography, exposure latitude can more than 100:1.
In photography, exposure range may refer to any of several types of dynamic range: The light sensitivity range of photographic film, paper, or digital camera sensors. The luminosity range of a scene being photographed. The opacity range of developed film images; The reflectance range of images on photographic papers.
Dynamic range (or exposure range) is the range of light levels a camera can capture, usually measured in f-stops, EV (exposure value), or zones (all factors of two in exposure). It is closely related to noise: high noise implies low dynamic range. Tone reproduction is the relationship between scene luminance and the reproduced image brightness.
Often, the motivation is to achieve consistency in dynamic range for a set of data, signals, or images to avoid mental distraction or fatigue. For example, a newspaper will strive to make all of the images in an issue share a similar range of grayscale. Normalization transforms an n-dimensional grayscale image : {} {,..