You might look at Image Magic. I am using Ruby which has a wrapper RMagick -
drawing outline boxes in blue on a black image. The Outline.tdrect sets up
the rectangles and gc.draw(izb) superimposes them on the tif image. The
images vary slightly in size, so the bounding box information is used to
tweek things. It works, but could work better.
Zlib::GzipReader.open("imagefiles/" + fname + ".tif.gz"){|gz|
gzb = gz.read
izb = ImageList.new
izb.from_blob(gzb)
bb = izb.bounding_box
bbtxt = "#{bb.width}x#{bb.height}+#{bb.x}x#{bb.y}"
gc = Outline.tdrect(bbtxt)
gc.draw(izb)
izb.resize(0.3).display
`tesseract #{name + ".tif"} #{name}`
)
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