Hi!! I never had problems with TARGUS (AES4000) sensor but suddenly it started to give me bad images. I also try my program with DIGITAL PERSONA and UPEK TOUCH CHIP without problems. So I think the problem is in the way that the sensor gives data to libfprint ¿?¿?
I obtain the fingerprint with capture and then: r = fp_img_save_to_file(img, "FP.pgm"); It's ok because it works with the other sensors but not with TARGUS. Anybody has/know the same problem? I opened the image and I realised that it has a lot of characters " " I uploaded if you want to see it in .pgm format : https://www.yousendit.com/download/Y2o5cHBFNXYzMW14dnc9PQ Thank you very much.
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