Mark Six Ticket iOS OCR

• transform mark six ticket
• OCR
• extract important information
• stores on server
• notify after draw result is released

Tech details

• iOS - Swift
• Cocoapods
• OpenCV
• Tesseract

01 Chore: Preprocess by greyscale or not ?

Test Code

var image = originalImage!.image
var greyScaleImage = MarkSixOpenCV.filterBlackColor(image);
convertedImage!.image = greyScaleImage as UIImage;

let tesseract = Tesseract(language: "eng");
tesseract.delegate = self;

tesseract.setVariableValue("0123456789+$ABCDEFGHIJKLMNOPQRSTUVXYZ.", forKey: "tessedit_char_whitelist") //limit search

tesseract.image = image; //image to check
tesseract.recognize();

NSLog("Before grey %@", tesseract.recognizedText!);

tesseract.image = greyScaleImage; //image to check
tesseract.recognize();

NSLog("After grey %@", tesseract.recognizedText!);

Before Greyscale

2014-10-11 11:09:38.765 MarkSixOCR[10272:160716] Before grey 0. 0E.R1QF03$$1  ISLVA 01
000.0E 
Z1E3E$E E$Z$3 MM 30 901010 P1CK
3L1$35MDI0VV N00 095
7+8+13+14+15+46
I 1+ 19+24+42+43+45
R $$ 3 E UNI 300 $10.00
75  TOI3I $20.00
L1 14513851613 16AUG14
77.7. 00000
 0711009 136F
02090 324EE Z2DA9 S4F3
DYLDEUUL1L9AU6C8I.E57I.I.D2 0
IHIIIIIIIHIIIINNNIIIINIHIMM0
  0 6

After Greyscale

2014-10-11 11:09:37.122 MarkSixOCR[10272:160716] After grey  E$H$ R 1 $ V3E3 M IVNVA 14.1
X J11E141  1155 LHNE1

11LQ $55 $EEE  MMK $1 MK PM

 E.JI 3$ 1  DUIVV $ 12  U95
7 +3+13 F14+15+46

I.L+19+24+42+43+45
13$ UM F331 $10.CQ

5753  E HM  E20.00

14 E35165 ..6AUG14
V J 07 M19 13F 7
53 1 0120.3 324EE ADA9 54F3
  UTLUEUT  I19AU65E .E571.1.D2
  NIN  II1II1HI1$1  EINNMM
KIIIMEE1IBIIII.1.1 JHH IIIIIIM1 
M .M E I