I admit that the code above is a bit messy, but it is just for testing out to see this actually works. In writing the code, I would like to acknowledge the following especially helpful references.
To compile the file and run it, first, create Test.java with the code above. Then, download Zxing's core library file (most recent version at the time of writing this is core-3.3.0.jar) form here. Then, run the following, assuming the jar file is in the same directory.
$ javac Test.java -cp ".:core-3.3.0.jar"
$ java -cp ".:core-3.3.0.jar" Test image_to_test.jpg
This will output the local thresholded image binary_output.jpg to the same folder. If you want to know more about java and javac -cp option, refer to this tutorial.
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