Image Data Model: _isBlank

Image Data Model: _isBlank

Identifies blank separator pages during scanning.

Restrictions: Used only with monochrome (black-and-white) images

Syntax
Details
Example

Syntax

CALL SEND (object-id, '_isBlank', status);

Argument Type Description

status
N a value indicating whether the current page is blank:

1 blank

0 not blank

Argument	Type	Description
status	N	a value indicating whether the current page is blank:
		1	blank
		0	not blank

Details

_isBlank checks an image to see if all the pixels are the same. Pixels around the edge of the image are ignored and a few noise pixels in the middle are allowed. Blank pages can be used to separate documents when scanning multiple pages.

Example

call send (imdat_id, '_read_', 'hpscan',
          'device=scanner, dpi=100');
call send (imdat_id, '_is_blank_', blank);
if (blank=1) then
   put 'Ignore this blank page.');

Chapter Contents
Previous
Next
Top of Page