mediaLib Library Functions               mlibImageThresh4(3MLIB)



NAME
     mlibImageThresh4 - image thresholding

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

     mlibstatus mlibImageThresh4(mlibimage *dst, const mlibimage *src,
          const mlibs32 *thigh, const mlibs32 *tlow, const mlibs32 *ghigh,
          const mlibs32 *glow);


DESCRIPTION
     The mlibImageThresh4() function compares each pixel in  the
     source image to two threshold values, tlow and thigh. If the
     pixel is less than the lower threshold value, tlow, then the
     destination pixel is set to the lower output level, glow. If
     the pixel is greater than the higher threshold value, thigh,
     then  the  destination  pixel  is  set  to the higher output
     level, ghigh. Otherwise, the destination pixel is set to the
     value of the source pixel.


     It uses the following equation:

       dst[x][y][i] = glow[i]       if src[x][y][i] < tlow[i]
       dst[x][y][i] = src[x][y][i]  if tlow[i] < src[x][y][i] < thigh[i]
       dst[x][y][i] = ghigh[i]      if src[x][y][i] > thigh[i]


PARAMETERS
     The function takes the following arguments:

     dst      Pointer to destination image.


     src      Pointer to source image.


     thigh    High  threshold  value.  thigh[i]  holds  the  high
              threshold for channel i.


     tlow     Low threshold value. tlow[i] holds the  low  thres-
              hold for channel i.


     ghigh    High output grayscale  level.  ghigh[i]  holds  the
              high output grayscale level for channel i.






SunOS 5.11           Last change: 2 Mar 2007                    1






mediaLib Library Functions               mlibImageThresh4(3MLIB)



     glow     Low output grayscale level. glow[i] holds  the  low
              output grayscale level for channel i.


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
     mlibImageThresh1(3MLIB),       mlibImageThresh1Fp(3MLIB),
     mlibImageThresh1FpInp(3MLIB),
     mlibImageThresh1Inp(3MLIB),      mlibImageThresh2(3MLIB),
     mlibImageThresh2Fp(3MLIB),
     mlibImageThresh2FpInp(3MLIB),
     mlibImageThresh2Inp(3MLIB),      mlibImageThresh3(3MLIB),
     mlibImageThresh3Fp(3MLIB),
     mlibImageThresh3FpInp(3MLIB),
     mlibImageThresh3Inp(3MLIB),   mlibImageThresh4Fp(3MLIB),
     mlibImageThresh4FpInp(3MLIB),
     mlibImageThresh4Inp(3MLIB),      mlibImageThresh5(3MLIB),
     mlibImageThresh5Fp(3MLIB),
     mlibImageThresh5FpInp(3MLIB),
     mlibImageThresh5Inp(3MLIB), attributes(5)

















SunOS 5.11           Last change: 2 Mar 2007                    2