| .TH IM_ZEROX 3 "14 May 1991" |
| .SH NAME |
| im_zerox \- find the zero crossings of an image |
| .SH SYNOPSIS |
| .B #include <vips/vips.h> |
| |
| int im_zerox(in, out, flag) |
| .br |
| IMAGE *in, *out; |
| .br |
| int flag; |
| |
| .SH DESCRIPTION |
| im_zerox() detects the positive and negative edges of zero crossings of an |
| image held by the image descriptor in, depending on the flag. |
| |
| If flag is -1 the negative zero crossings are returned. |
| If flag is 1 the positive zero crossings are returned. |
| |
| The output image is byte with zero crossing set to 255 and all other values |
| set to zero. Input can have any number of channels, and be any non-complex type. |
| |
| .SH RETURN VALUE |
| The function returns 0 on success and -1 on error. |
| .SH SEE ALSO |
| im_conv(3). |
| .SH COPYRIGHT |
| N. Dessipris |
| .SH AUTHOR |
| N. Dessipris \- 14/05/1991 |
