Histogram StdDev¶
Calculates the standard deviation of all pixels in a buffer, given a histogram
Comments¶
The Histogram StdDev node calculates the standard deviation of all pixel values of a buffer, given a historam to it.
If a color buffer is used, the standard deviation is calculated channel-wise.
The standard deviation is a measure of statistical dispersion, averaging the squared distance of values from the mean value. The standard deviation is a measure of how much a statistical distribution is spread out. The standard deviation is the square root of the variance.
The standard deviation is calculated according to this formula:
\(\sigma = \sqrt[]{ \frac {1}{n} \sum x^2 - \mu^2 }\)
