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Utilities used to recognize captchas from dynamic.12306.cn. Usage: 1. Download a .jpg image from https://dynamic.12306.cn/otsweb/passCodeAction.do?rand=lrand 2. Convert the image to .ppm format with ImageMagick. 3. ./recog file-name.ppm Note, an additional file "network.data" is required for the utility "recog" to work correctly. Program "train" can be used to generate this file. Currently only 30%~40% of the recognitions are correct. Improve function Captcha::segment() should be able to improve the overall correctness.