This is doing only negative kerning (no distortion) and some lines thrown in. The lines would probably be easy to defeat, but should definitely help the naive attacker case where people just throw it in to tesseract
Note, this uses the DejaVuSans font, instead of the FreeMonoBoldOblique.ttf that Wikipedia currently uses
View other captcha tests: Current captcha | Tim's proposal | Tim's captcha without gradiant | Current captcha with OCR rejection | Using negative kerning and less harriness [Bawolff's proposal] | Negative kerning and harriness
Tesseract (off the shelf. No special training. Version 3.03 -psm 8. Later versions and -psm 13 may have slightly better results) success on this set is 2 (out of 200) or 1.0 %
