## NAME

         uniform_noise - Add uniform noise to an image

## SYNOPSIS

         #include "CVIPnoise.h"

         Image *uniform_noise(Image *imageP,float *var,float *mean);

          <imageP> - pointer to Image structure
          <var> - variance of noise distribution
          <mean> - mean or average value of distribution

## PATH

         $CVIPHOME/NOISE/noise.c

## DESCRIPTION

         Uniform type noise is simply generated according to:

                     1/a-b   for a<=Gi<=b
              hi =
                     0 elsewhere

         where Gi is the grey-level value of the ith  pixel,  'a'  is
         the  minimum  and 'b' is the maximum gray level value of the
         noise.

## RETURN VALUES

         The uniform_noise()  function  returns  the  modified  Image
         pointer on success, and returns a NULL pointer on failure

## BUGS

         none

## EXAMPLE

          #include <CVIPtoolkit.h>
          #include <CVIPimage.h>
          #include <CVIPconvert.h>
          #include <CVIPview.h>
          #include "CVIPnoise.h"
          #define VIEWER "picture"
          #define VIDEO_APP "SunVideo &"

          void main()
          {
          Image *cvipImage;
          IMAGE_FORMAT format;
          char *inputfile,*outputfile;
          float var=100.0;
          float mean=2;
          setDisplay_Image(VIEWER, "Default");

          print_CVIP("\n\t\tEnter the Input File Name:  ");
          inputfile =(char *) getString_CVIP();
          format = getFormat_CVIP(inputfile);
          cvipImage = read_Image(inputfile, 1);
          view_Image(cvipImage, inputfile);
          free(inputfile);
          /* the following call adds gamma noise to the input image
          with the variance equal to 100.0 and the mean
          equal to 0.5.We can use the function uniform_noise_setup so
          that the user can specify the inputs  */
          cvipImage = uniform_noise(cvipImage,&var,&mean);
          print_CVIP("\n\t\tEnter the Output File Name:  ");
          outputfile = getString_CVIP();
          view_Image(cvipImage,outputfile);
          write_Image(cvipImage,outputfile,CVIP_NO,CVIP_NO,format,1);
          free(outputfile);
          }

## SEE ALSO

         gamma_noise(3),     gaussian_noise(3),     neg_exp_noise(3),
         rayleigh_noise(3), speckle_noise(3)

## AUTHOR

         Copyright (C) 1992, 1996 SIUE -  by  Scott  E.  Umbaugh  and
         David Lyons.