Embossed cards are designed to be printed. Have you considered taking an impression and scanning the impression? Or just scanning (magnetically) the magnetic strip on the card?
There have been other discussions of training Tesseract for OCR-A (and I think OCR-B). Farrington 7B is another in that set of OCRable fonts, so the process should be the same. Tom On Wednesday, November 21, 2012 9:41:02 AM UTC-5, Neo Song wrote: > > Thank you for your reply! > And since the bank card embossing characters are designed to be > OCR-able(according to the ISO 7811 spec), why there is no implementation > examples available on the internet? And there is no similar problem in > tesseract forum either. I have searched for a lot, but I find nothing. > This problem should be an easy one or not? > > 在 2012年11月20日星期二UTC+8下午9时45分13秒，TP写道： >> >> On Mon, Nov 19, 2012 at 9:07 AM, Neo Song <[email protected]> wrote: >> >>> Dear All, >>> I am now needing to OCR the embossing characters on the bank card. >>> These characters are in two kind of font. The first one is Farrington 7B, >>> which is used to present the account number, and another font is >>> unknown(maybe bank-dependent) and is used to present card holder name, card >>> issue time and card serial number. >>> Now the problem is the embossing characters are very difficult to >>> OCR since they will be very bright under special light. While if the extra >>> light is not applied, the card background will largely affect these >>> characters, and will cause error. >>> I have uploaded two images. The first sample image shows that >>> improper light applied will cause the characters to be dark/light mixed and >>> OCR result is very bad. The second image shows that a better light will >>> make the background dark and embossing characters very sharp, while the OCR >>> result is a little bit better, but still not good enough. >>> Can anybody give me some advice on the light applied, or image >>> pre-processing technique to improve the OCR result? Thank you all! >>> >> >> Crazy (and expensive) idea: >> >> How about taking two or maybe four pictures of each card with the light >> coming low from the side on the left and right (and maybe also from >> top/bottom), then doing some sort of image processing combination? >> Hopefully if the light is low enough the background will fade out and only >> the various edges of the raised characters will be visible. Of course this >> would require some special hardware and the ability to turn a different >> light on for each scan. >> > -- You received this message because you are subscribed to the Google Groups "tesseract-ocr" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/tesseract-ocr?hl=en
