mediaLib Library Functions           mlibImageGradient3x3(3MLIB)



NAME
     mlibImageGradient3x3 - 3x3 gradient filter

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

     mlibstatus mlibImageGradient3x3(mlibimage *dst, const mlibimage *src,
          const mlibd64 *hmask, const mlibd64 *vmask, mlibs32 cmask, mlibedge edge);


DESCRIPTION
     The mlibImageGradient3x3() function performs edge detection
     by  computing  the magnitude of the image gradient vector in
     two orthogonal directions using 3x3 gradient filtering.


     It uses the following equation:

       dst[x][y][i] = ( SH(x,y,i)**2 ] SV(x,y,i)**2 )**0.5



     where SH() and SV() are the horizontal and vertical gradient
     images  generated  from  the  corresponding  channel  of the
     source image by correlating it with the supplied  orthogonal
     (horizontal and vertical) gradient masks.

PARAMETERS
     The function takes the following arguments:

     dst      Pointer to destination image.


     src      Pointer to source image.


     hmask    Pointer to horizontal mask in row-major order.


     vmask    Pointer to vertical mask in row-major order.


     cmask    Channel mask to indicate the channels  to  be  con-
              volved,  each  bit of which represents a channel in
              the image. The channels corresponding to 1 bits are
              those  to be processed. For a single channel image,
              the channel mask is ignored.


     edge     Type of edge condition. It can be one of  the  fol-
              lowing:



SunOS 5.11           Last change: 2 Mar 2007                    1






mediaLib Library Functions           mlibImageGradient3x3(3MLIB)



                MLIBEDGEDSTNOWRITE
                MLIBEDGEDSFILZERO
                MLIBEDGEDSTCOPYSRC
                MLIBEDGESREXTEND



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

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



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


SEE ALSO
     mlibImageGradient3x3Fp(3MLIB),
     mlibImageGradientMxN(3MLIB),
     mlibImageGradientMxNFp(3MLIB), attributes(5)

























SunOS 5.11           Last change: 2 Mar 2007                    2