NAME

       visgrep - Visual grep, greps for images in another image

SYNOPSIS

       visgrep [options] image.png detect.png match.png ...

DESCRIPTION

       visgrep is a program that greps for image in another image.

       The detect.png and match.png files can also be .pat files.

       All  .pat  files  are created using png2pat(1) or rgb2pat(1). The image.png is scanned for
       detect.pat starting from X,Y given in parameters.  When detect.pat is found, then all  the
       match.pat  files are scanned at an offset of x,y given in parameters. If a match is found,
       then visgrep prints the x,y and index of the item.

       For example, image.png is a screenshot and match1.pat .. match5.pat are images of  letters
       a  to e. Each of these letters is enclosed in a blue box, so detect.pat is an image of the
       upper left corner of the box. This box is not included in the match*.pat  files,  so  they
       are  actually  offset  5 pixels down and 4 pixels to the left.  You might run it like this
       then:

         visgrep -x-4 -y5 image.png match_corner.pat match_a.pat match_b.bat ...

       Etc, with all matches listed. Now suppose the screen showed ace so visgrep might output:

         10,10 0
         50,10 2
         90,10 4

       Showing that match_a.pat (index 0) is at 10,10 on the screen. If no match  is  found  even
       though the detection image is found, the index will be -1.

OPTIONS

       A summary of options is included below.

       -h     Show summary of options.

       -x     Set x offset for detection matching.

       -y     Set y offset for detection matching.

       -X     Start scanning at X.

       -Y     Start scanning at Y.

       -t     Set tolerance for 'fuzzy' matches, higher numbers are more tolerant.

EXIT STATUS

       0      at least one match was made.

       1      no matches were made.

       2      an error occurred.

SEE ALSO

       pat2ppm(1), patextract(1), png2pat(1), rgb2pat(1), xte(1).

AUTHOR

       visgrep was written by Steve Slaven <bpk@hoopajoo.net>.

       This  manual  page  was  written  by  Aurelien  Jarno <aurel32@debian.org>, for the Debian
       project (but may be used by others).

                                          April 20, 2004                               VISGREP(1)