The Sobel operator performs a 2-D spatial gradient measurement on an image and so emphasizes regions of high spatial frequency that correspond to edges. Typically it is used to find the approximate absolute gradient magnitude at each point in an input grayscale image. In theory at least, the ...
Luminosity is an absolute measure of radiated electromagnetic power (light), the radiant power emitted by a light-emitting object. LuminousFlux In photometry, luminous flux or luminous power is the measure of the perceived power of light. LuminousIntensity In photometry, luminous intensity is a ...
The term linear density is most often used when describing the characteristics of one-dimensional objects, although linear density can also be used to describe the density of a three-dimensional quantity along one particular dimension. Luminance ** Luminosity Luminosity is an absolute measure of ...