Visual Grep - Xautomation

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• Visual Grep - Xautomation

Visual Grep - Xautomation

Snippet

visual grep, greps for images in another image

Usage

visgrep [-hba] [-x x_off] [-y y_off]
        [-w x_off_width] [-h y_off_height]
        [-X start x_off] [-Y start y_off]
        [-d debuglevel] [-t tolerance] image.png detect.png match.png ...

  -h   This help
  -x   Set x offset for detection matching
  -y   Set y offset for detection matching
  -W   Set x offset width for detection matching
  -H   Set y offset height for detection matching
  -X   Start scanning at X
  -Y   Start scanning at Y
  -a   Scan all patterns, not just after matching the detection pattern
       note: this method is much slower because we scan for all images
             at every pixel instead of just at detection points.  Also,
             in this mode the detection image is ignored, there will be
             no matches for tile -1
  -t   Set tolerance for 'fuzzy' matches, higher numbers are more tolerant
  -b   Display 'badness' value, higher numbers mean match is less accurate,
       a badness value of 0 means the match is pixel-perfect

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

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

image.png must be an 8 bit deep RGB or RGBA png file.
For example, image.png is a screenshot and match1.pat .. to 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 -b -t50 -x-4 -y5 image.png match_corner.pat match_a.pat match_b.pat ...

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

0 10,10 0
12 50,10 2 
7 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.

The first match was 100% accurate, while the second and third were very slightly
inaccurate, probably due to anti-aliasing on the fonts.

Exit status is 0 for successful match, 1 for no match, and 2 for error.

See the [examples page](http://hoopajoo.net/projects/xautomation.html) for use cases for different flags

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