Noise reduction

(redirected from Despeckle)

noise reduction

[′nȯiz ri‚dək·shən]
(engineering acoustics)
A process whereby the average transmission of the sound track of a motion picture print, averaged across the track, is decreased for signals of low level; since background noise introduced by the sound track is less at low transmission, this process reduces noise during soft passages.

Noise reduction

Reducing the level of unwanted sound by any of several means of acoustical treatment.

noise reduction, NR

The difference in decibels between the average sound pressure levels produced in two rooms by a sound source in one of them.
References in periodicals archive ?
2) Quality control functions such as image rotation, image deskew, despeckle, and background suppression.
Cheng, "Comparison of despeckle filters for breast ultrasound images," Circuits, Systems, and Signal Processing, pp.
Thus, we propose to despeckle an SAR image by minimizing the L0-norm of the difference of average of the image.
9653 respectively, after the despeckle, gaussian (3%) attacks.
The methods are - Spatial for high frequency or fine noise, Threshold for light grain, Temporal for heavy or large grain and noise patterns, and Despeckle for uneven grain and/or noise.
Available effects include Adding Text, Anti-Alias, Average, Contrast, Deskew, Despeckle, Emboss, Gamma Correct, Grayscale, Hue, Intensity, Invert, Median, Mosaic, Motion Blur, Oilify, Posterize, Saturation, Sepia Tone, Sharpen, Solarize, Stamp, and more.
I used the program's despeckle filter to soften the apparent graininess.
Images can be processed (Add Noise, Anti-alias, Average, Brightness, Color Resolution, Contrast, Despeckle, Emboss, Gamma Correct, Gaussian Filter, Grayscale, Hue, Intensity Detect, Invert, Median, Mosaic, Motion Blur, Oilify, Posterize, Remove Redeye, Saturation, Sharpen, Shear, Solarize), and the functions can be applied directly from the context menu, offering a very streamlined experience.
Adjustments to brightness and contrast, as well as blur, mask, and despeckle filters can also be applied - all through easy-to-understand controls in the context-sensitive Measurements.
The program includes enhanced optical character recognition (OCR), page deskew & despeckle, blank page removal, barcode recognition and other image processing workflow processes.