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What (who) is Difference of Gaussians - definition
Difference of Gaussians
In imaging science, difference of Gaussians (DoG) is a feature enhancement algorithm that involves the subtraction of one Gaussian blurred version of an original image from another, less blurred version of the original. In the simple case of grayscale images, the blurred images are obtained by convolving the original grayscale images with Gaussian kernels having differing width (standard deviations).
Just-noticeable difference
AMOUNT THAT A STIMULUS MUST BE CHANGED TO BE DETECTED
Jnd; Differential threshold; Difference threshold; Just-noticable difference; Difference limen; Just noticeable difference; Just noticeable differences
In the branch of experimental psychology focused on sense, sensation, and perception, which is called psychophysics, a just-noticeable difference or JND is the amount something must be changed in order for a difference to be noticeable, detectable at least half the time (absolute threshold). This limen is also known as the difference limen, difference threshold, or least perceptible difference.
Relative change and difference
TECHNIQUES USED TO COMPARE TWO QUANTITIES
Percent error; % difference; Percent Difference; %difference; %ch; Relative difference; Percentage change; Percent change; Relative percent difference; Percentage increase; Relative change; Percent difference; Δ%; %CH; Percentage difference; Percent discrepancy; Log point; Log change
In any quantitative science, the terms relative change and relative difference are used to compare two quantities while taking into account the "sizes" of the things being compared. The comparison is expressed as a ratio and is a unitless number.
