unsharp masking


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unsharp masking

(un-sharp ) A process for amplifying fine detail in the image on a photographic plate. A positive contact copy is made through the glass on low-contrast film. The copy is blurred, containing only the large-scale features of the original image; this is the unsharp mask. When placed in contact with the back of the plate, it effectively cancels out the large-scale features, revealing the fine detail on the plate.
References in periodicals archive ?
Some techniques are used for zooming, Laplacian sharpening, contrast brightness, optical deblurring, turbulence deblurring, exposure, temperature tint, Wiener filter, bilateral filter, unsharp masking and homomorphic filter.
The crater rim and some of the rock layers needed a little unsharp masking to bring out detail.
Selective median filtering with unsharp masking technique has been presented by Patil and Raskar which removes the noise from the images but maintains the edges, which helps to better identify the leukocytes and lymphocytes during the segmentation [9].
The new method for automated particle detection involves four steps including image inversion and self-subtraction, unsharp masking based on the negative Laplacian transform [52,54], Canny Edge Detection (CED) [44], and Circular Hough Transform (CHT) [42,43].
Ensuing chapters discuss techniques such as multimodality imaging, nonlinear unsharp masking, wavelet-based feature extraction, fractal analysis, image reconstruction, and other interpolative procedures in the detection of breast, skin, and prostate cancers.
In [4], color image to be sharpened is first converted to YIQ or CIELAB color space, and then the method of unsharp masking and fuzzy morphological sharpening will be used to adjust the intensity of pixels around boundaries [4].
This book demonstrates Malin's technical skill, notably with some prints processed using unsharp masking, a very difficult process, not just the few 'mouse clicks' of today.
His darkroom techniques include dodging, burning, multiple filtration, flashing, bleaching, unsharp masking - anything it takes to make the image come alive..
Whether you are facing the arcane art of offset printing for the first time, a layout person trying to optimize the page without offending or a technology-driven person anxious to know absolutely everything about dot grain, there is no doubt Breede covers it, along with paper issues (including basis weight, M weight, ream weight, equivalent weights of paper, bulk determination, cubic area of skids or rolls), print calculations (such as total dot gain, density, opacity, printing cylinder calculations, color spaces and color calculations), prepress (including file size, scanning resolutions, unsharp masking and gray levels) and common conversions, including nonmetrics to metrics.
Included are basic tools for unsharp masking, enhancing contrast and removing artifacts created by compression.
Similar to the Kodak software, Capture One is for processing RAW image files and provides a range of image adjustments, such as gray balance, levels/curves, contrast, crop, sizing, and unsharp masking. The functions are carried out with instant feedback on the computer screen.
We have tested this new confocal system on biological specimens and have added a further improvement to the image by digital unsharp masking. As shown in panels A and B in Figure 1, the new confocal system does provide optical sections of fluorescent objects that are considerably improved over conventional epifluorescence.