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Unsharp masking applied to lower part of image. 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 ...
Masking in darkroom photography can be used with more than one mask for the image by putting the original image and the mask together to come out with the single print. The advantages of masking is that this process sharpens the image and if done correctly, the contrast of the image could change when the image prints out.
Edge enhancement is an image processing filter that enhances the edge contrast of an image or video in an attempt to improve its acutance (apparent sharpness).. The filter works by identifying sharp edge boundaries in the image, such as the edge between a subject and a background of a contrasting color, and increasing the image contrast in the area immediately around the edge.
In image processing, a kernel, convolution matrix, or mask is a small matrix used for blurring, sharpening, embossing, edge detection, and more. This is accomplished by doing a convolution between the kernel and an image. Or more simply, when each pixel in the output image is a function of the nearby pixels (including itself) in the input image ...
The process of data erasure involves masking all information at the byte level through the insertion of random 0s and 1s in on all sectors of the electronic equipment that is no longer in use. [1] This software based method ensures that all data previous stored is completely hidden and unrecoverable, which ensures full data sanitization.
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