laplace

Name

laplace - edge and line detection

Syntax

 #include <xite/convolve.h>

 void laplace( IBAND input, IBAND output, int a,
    int b, int c, double scale, double offset,
    int verbose );

Description

laplace performs the convolution between a band input and a convolution kernel conv.


        a          b          a
        b          c          b
        a          b          a

The result of the convolution is scaled

   pix = (conv. result) * scale + offset;

If scale is zero an autoscaling is performed. If verbose flag is set, the number of underflows and overflows are printed. If verbose flag is set and autoscale is performed the scale and offset factors are displayed

conv3x3_overflow and conv3x3_underflow are global variabels and may be declared as

 extern int conv3x3_overflow, conv3x3_underflow

Author

Otto Milvang

Examples

Id

$Id: laplace.c,v 1.25 1996/11/08 14:03:05 svein Exp $