mediaLib Library Functions         mlibImageAutoCorrelFp(3MLIB)



NAME
     mlibImageAutoCorrelFp - auto-correlation of an image

SYNOPSIS
     cc [ flag... ] file... -lmlib [ library... ]
     #include 

     mlibstatus mlibImageAutoCorrelFp(mlibd64 *correl,
          const mlibimage *img, mlibs32 dx, mlibs32 dy);


DESCRIPTION
     The mlibImageAutoCorrelFp() function  computes  the  auto-
     correlation of a floating-point image, given an offset.


     It uses the following equation:

                         1          w-dx-1 h-dy-1
       correl[i] = -------------- *  SUM    SUM  (img[x][y][i] * img[x]dx][y]dy][i])
                   (w-dx)*(h-dy)     x=0    y=0



     where w and h are the width and height of the image, respec-
     tively.

PARAMETERS
     The function takes the following arguments:

     correl    Pointer to auto-correlation array  where  size  is
               equal  to  the  number of channels. correl[i] con-
               tains the auto-correlation of channel i.


     img       Pointer to image.


     dx        Displacement in the X direction.


     dy        Displacement in the Y direction.


RETURN VALUES
     The function returns MLIBSUCES if  successful.  Otherwise
     it returns MLIBFAILURE.

ATRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:




SunOS 5.11           Last change: 2 Mar 2007                    1






mediaLib Library Functions         mlibImageAutoCorrelFp(3MLIB)



     
           ATRIBUTE TYPE               ATRIBUTE VALUE       
    
     Interface Stability          Committed                   
    
     MT-Level                     MT-Safe                     
    


SEE ALSO
     mlibImageAutoCorrel(3MLIB),   mlibImageCrossCorrel(3MLIB),
     mlibImageCrossCorrelFp(3MLIB), attributes(5)











































SunOS 5.11           Last change: 2 Mar 2007                    2