RandomJ: Gamma
General Description
This plugin enables one to contaminate images with random numbers generated using a gamma random variable.
Dialog Description
Order. The order parameter of the probability density function of the gamma random variable:
where α is the order. In this case, the order must be an integer larger than zero.
Insertion. The random numbers can be inserted into the image either additively or multiplicatively.
Implementation Details
The generator is based on [1] and uses the Uniform plugin as a source of uniform random numbers. Since the uniform number generator is initialized with a seed derived from the system's current time in milliseconds, the sequence of random numbers will be different for each run of this plugin, provided there is a time interval of at least one millisecond between the runs.
References
| [1] | W. H. Press, S. A. Teukolsky, W. T. Vetterling, B. P. Flannery. Numerical Recipes in C: The Art of Scientific Computing. 2nd ed., Cambridge University Press, Cambridge, 1992. |
| [2] | A. Leon-Garcia. Probability and Random Processes for Electrical Engineering. Addison-Wesley Publishing Company, Reading, MA, 1989. |