Manual Pages for UNIX Operating System command usage for man mlib_ImageGradientMxN

mediaLib Library Functions           mlib_ImageGradientMxN(3MLIB)



NAME
     mlib_ImageGradientMxN - MxN gradient filter

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

     mlib_status mlib_ImageGradientMxN(mlib_image *dst, const mlib_image *src,
          const mlib_d64 *hmask, const mlib_d64 *vmask, mlib_s32 m, mlib_s32 n,
          mlib_s32 dm, mlib_s32 dn, mlib_s32 cmask, mlib_edge edge);


DESCRIPTION
     The mlib_ImageGradientMxN() function performs edge detection
     by  computing  the magnitude of the image gradient vector in
     two orthogonal directions using MxN 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.


     m        Width of the convolution kernel. m > 1.


     n        Height of the convolution kernel. n > 1.


     dm       X coordinate of the key element in the  convolution
              kernel. 0 < dm < m.



SunOS 5.11           Last change: 2 Mar 2007                    1






mediaLib Library Functions           mlib_ImageGradientMxN(3MLIB)



     dn       Y coordinate of the key element in the  convolution
              kernel. 0 < dn < n.


     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:

                MLIB_EDGE_DST_NO_WRITE
                MLIB_EDGE_DS_FILL_ZERO
                MLIB_EDGE_DST_COPY_SRC
                MLIB_EDGE_SR_EXTEND



RETURN VALUES
     The function returns MLIB_SUCCESS if  successful.  Otherwise
     it returns MLIB_FAILURE.

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



     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | Interface Stability         | Committed                   |
    |_____________________________|_____________________________|
    | MT-Level                    | MT-Safe                     |
    |_____________________________|_____________________________|


SEE ALSO
     mlib_ImageGradientMxN_Fp(3MLIB),
     mlib_ImageGradient3x3(3MLIB),
     mlib_ImageGradient3x3_Fp(3MLIB), attributes(5)











SunOS 5.11           Last change: 2 Mar 2007                    2