Legacy ImageMagick Discussions Archive

Greetings Magick gurus!

I've been experimenting with some image enhancement to allow my OCR software to read barcodes better.
I first receive a "poor" scan of a dotmatrix report. This report has a barcode in the corner. My first step was to crop out this barcode from the main image.

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convert document.tif -crop 975x275+0+0 bcode.pnm

Now I enhanced the image by "multiplying" it over itself, making it bolder by shifting a pixel or two vertically.

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/composite -compose multiply -geomtry -0-1 bcode.pnm bcode.pnm boldcode.pnm

Lastly, I 'defuzz' the edges/remove specks with a median.

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convert -median 1 boldcode.pnm

I'd like to combine this 3 phase system into a single script with one in file, and one out file, and skip the 2 intermdiate steps, and hen feed that image to my decoding software. My experiments in combining them aren't working yet. Can anyone shed a light on quick way to merge these? Perhaps a way to store the image internally while processing using file: ?

Thanks in advance for your tips & advice!

Wand-config --version = 6.2.9, RHEL4 2.6.9-42.0.2.ELsmp

There may be better ways to do some of the steps, but in general (for IM version 6, not 5) just append the operations one after the other...

You shoud remove the unwanted virtual canvas stuff after the crop (using +repage). Saving to PNM did this automatically as it doesn't understand virtual canvas or page info.

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convert document.tif -crop 975x275+0+0 +repage \
             \( +clone \) -geomtry -0-1 -compose multiply -composite \
             -median 1 boldcode.pnm

Da Daaa....

Note that I use a +clone to double up the image for the multiply, and -geometry to specify the offset for the comming -composite.

Legacy ImageMagick Discussions Archive

Clever combine of multi-stepped process.

Clever combine of multi-stepped process.