Unsharp masking (USM) is an image sharpening technique, first implemented in darkroom photography, but now commonly used in digital image processing software. Its name derives from the fact that the technique uses a blurred, or "unsharp", negative image to create a mask of the original image. The unsharp mask is then combined with the original positive image, creating an image that is less blurry than the original. The resulting image, although clearer, may be a less accurate representation of the image's subject.
In the context of signal processing, an unsharp mask is generally a linear or nonlinear filter that amplifies the high-frequency components of a signal.
Unsharpmasking (USM) is an image sharpening technique, first implemented in darkroom photography, but now commonly used in digital image processing software...
negative (high acutance developers), or by optical means in printing (unsharpmasking). In digital photography, onboard camera software and image postprocessing...
Bilateral filter Average with limited data validity Smoothing Sharpening Unsharpmasking High-pass filter Huang, Thomas S.; Yang, George J.; Tang, Gregory Y...
enhancement technologies such as video denoising, image stabilization, unsharpmasking, and super-resolution.[citation needed] Several articles provide an...
systems use edge-detection in a way analogous to the brain, using unsharpmasking to clarify edges in photos for example. Acutance Cornsweet illusion...
is re-assembled in the darkroom, where further techniques such as unsharpmasking to enhance fine detail might also be applied. In 1986 he discovered...
pixels in the long dimension, or smaller 75×75 pixels. It also applies unsharpmask to them. Picasa automatically produces thumbnails that are a maximum...
compressed) and applies unsharpmasking with a large radius, which increases local contrast rather than sharpening. See unsharpmasking: local contrast enhancement...
Gen – CryEngine 2 Video showing SSAO in action Image Enhancement by UnsharpMasking the Depth Buffer Hardware Accelerated Ambient Occlusion Techniques...
room correction Free deconvolution Point spread function Deblurring Unsharpmasking O'Haver, T. "Intro to Signal Processing - Deconvolution". University...
within the lines. The pencil lines also have interior defects due to the roughness (tooth) of the paper. The scan also has some unsharpmasking artifacts....
digitally (focus stacking). Usually this involves the use of software with unsharpmasking, a filtering algorithm that removes out-of-focus portions of each exposure...
according to a number of properties; the most common algorithm is unsharpmasking, which has the following parameters: Amount. This controls the extent...
Mind, a studio album by the band Covenant Unlisted Securities Market Unsharpmasking, an image processing method United Socialist Movement, UK, 1934-1965...
fringing correction contrast manipulation increasing visual acuity by unsharpmasking dynamic range compression – lighten shadow regions without blowing...
used to both sharpen and blur images in a number of ways, such as unsharpmasking or deconvolution. Portraits often appear more pleasing when selectively...
High-dynamic-range imaging (HDR) Image histogram Scanning Film scanner Unsharpmasking Alternative process Bleach bypass Bromoil process Cross processing...
contrast between the light and dark creates a sharper image. (Compare unsharpmasking in digital processing). This mechanism also creates the Mach band visual...
three-part histogram, gradation curves, selective color correction, unsharpmasking, color cast removal slider, color separation, and CMYK-preview. SilverFast...
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