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STDIFF

Section: C Library Functions (3)
Updated: 16 Mar 1998
Index

NAME

stdiff - local statistical differencing

SYNTAX

void stdiff( IBAND input,
    IBAND output, int deltax,
    int deltay, double alpha, double beta,
    double m0, double s0 );

DESCRIPTION

Local Pixel Value Mapping.

r(x,y) = u(x,y) + s(x,y)
u(x,y) = alpha * m0 + (1-alpha) * bm(x,y)
s(x,y) = (b(x,y)-bm(x,y)) * (beta*s0 / (s0+bs(x,y)))

r(x,y)  = result image
u(x,y)  = mean component
s(x,y)  = st. dev component
m0      = The mean to force locally
alpha   = fraction m0 <--> local mean
b(b,y)  = pixel value in (x,y)
bm(x,y) = local mean
bs(x,y) = local st. dev
s0      = new st. dev
beta    = parameter to control s0 <--> local st.dev

deltaxis local area width, deltayis local area height.

RESTRICTIONS

inputand outputmust have pixel type unsigned byte.

RETURN VALUE

0 : Ok
1 : Bad input pixel type
2 : Bad output pixel type

REFERENCE

Wayne Niblack: An introduction to Digital Image Processing

AUTHOR

Otto Milvang

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