Manual Pages for UNIX Operating System command usage for man mlib_ImageConv2x2

mediaLib Library Functions               mlib_ImageConv2x2(3MLIB)



NAME
     mlib_ImageConv2x2 - 2x2 convolution

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

     mlib_status mlib_ImageConv2x2(mlib_image *dst, const mlib_image *src,
          const mlib_s32 *kernel, mlib_s32 scale, mlib_s32 cmask,
          mlib_edge edge);


DESCRIPTION
     The mlib_ImageConv2x2() function performs a 2x2  convolution
     on the source image by using the user-supplied kernel.


     The input image and the output  image  must  have  the  same
     image  type  and  have  the  same  number  of  channels. The
     unselected channels in the output image are not overwritten.
     For single-channel images, the channel mask is ignored.


     For this convolution, the key  element  of  the  convolution
     kernel is located at (0, 0) of the kernel matrix.


     It uses the following equation:

                      m-1-dm n-1-dn
       dst[x][y][i] =  SUM    SUM  src[x+p][y+q][i]*k[p][q]*2**(-scale)
                      p=-dm  q=-dn



     where m = 2, n = 2, dm = (m - 1)/2 = 0, dn = (n - 1)/2 = 0.

PARAMETERS
     The function takes the following arguments:

     dst       Pointer to destination image.


     src       Pointer to source image.


     kernel    Pointer to the convolution kernel,  in  row  major
               order.


     scale     Scaling factor.




SunOS 5.11           Last change: 2 Mar 2007                    1






mediaLib Library Functions               mlib_ImageConv2x2(3MLIB)



     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 bits with
               a  value  of  1  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_DST_FILL_ZERO
                 MLIB_EDGE_DST_COPY_SRC
                 MLIB_EDGE_SRC_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_ImageConv2x2_Fp(3MLIB),  mlib_ImageConv2x2Index(3MLIB),
     mlib_ImageConv3x3(3MLIB),       mlib_ImageConv3x3_Fp(3MLIB),
     mlib_ImageConv3x3Index(3MLIB),     mlib_ImageConv4x4(3MLIB),
     mlib_ImageConv4x4_Fp(3MLIB),  mlib_ImageConv4x4Index(3MLIB),
     mlib_ImageConv5x5(3MLIB),       mlib_ImageConv5x5_Fp(3MLIB),
     mlib_ImageConv5x5Index(3MLIB),     mlib_ImageConv7x7(3MLIB),
     mlib_ImageConv7x7_Fp(3MLIB),  mlib_ImageConv7x7Index(3MLIB),
     mlib_ImageConvKernelConvert(3MLIB),
     mlib_ImageConvMxN(3MLIB),       mlib_ImageConvMxN_Fp(3MLIB),
     mlib_ImageConvMxNIndex(3MLIB), mlib_ImageConvolveMxN(3MLIB),
     mlib_ImageConvolveMxN_Fp(3MLIB),  mlib_ImageSConv3x3(3MLIB),
     mlib_ImageSConv3x3_Fp(3MLIB),     mlib_ImageSConv5x5(3MLIB),
     mlib_ImageSConv5x5_Fp(3MLIB),     mlib_ImageSConv7x7(3MLIB),
     mlib_ImageSConv7x7_Fp(3MLIB),
     mlib_ImageSConvKernelConvert(3MLIB), attributes(5)



SunOS 5.11           Last change: 2 Mar 2007                    2