python - OpenCV digit OCR -

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i trying build simple sudoku grabber scans sudoku image , extracts digits in order (0 blank). have extracted 81 box approximately.

screen_shot of cells 9x9

http://i.stack.imgur.com/x2t6u.png

code

import cv2 import numpy np  import cv2.cv cv import tesseract    def rectify(h):         h = h.reshape((4,2))         hnew = np.zeros((4,2),dtype = np.float32)          add = h.sum(1)         hnew[0] = h[np.argmin(add)]         hnew[2] = h[np.argmax(add)]          diff = np.diff(h,axis = 1)         hnew[1] = h[np.argmin(diff)]         hnew[3] = h[np.argmax(diff)]          return hnew  img=cv2.imread('sudoku.jpg') gray = cv2.cvtcolor(img,cv2.color_bgr2gray)  gray = cv2.gaussianblur(gray,(5,5),0) thresh = cv2.adaptivethreshold(gray,255,1,1,11,2)   contours,hierarchy = cv2.findcontours(thresh, cv2.retr_tree, cv2.chain_approx_simple)  biggest = none max_area = 0 in contours:         area = cv2.contourarea(i)         if area > 100:                 peri = cv2.arclength(i,true)                 approx = cv2.approxpolydp(i,0.02*peri,true)                 if area > max_area , len(approx)==4:                         biggest = approx                         max_area = area cv2.drawcontours(img, biggest, -1, (0,255,0), 8)  biggest=rectify(biggest)  h = np.array([ [0,0],[449,0],[449,449],[0,449] ],np.float32) retval = cv2.getperspectivetransform(biggest,h) thresh = cv2.adaptivethreshold(gray,255,1,1,11,2)  warp = cv2.warpperspective(thresh,retval,(450,450))  x=0 string='' x in range (0,9) :         y in range (0,9):             morph=warp[(49*y):((49*y)+50),(49*x):((49*x)+50)]                cv2.imwrite('sudokudigits/cell'+str(x)+str(y)+'.jpg',morph)              print str(x)+str(y)+" >> "+ string   cv2.imshow('frame',thresh) cv2.imshow('wraped_roi',warp)  cv2.waitkey(0) cv2.destroyallwindows()

things want do:

  1. as see there parts of grid in extracted cells, want extract exact digit part ocr purpose.

  2. i tried knn results wrong due blank spaces.

  3. i tried tesseract failed too

  4. http://opencvpython.blogspot.in/2012/06/sudoku-solver-part-1.html followed tutorial!

  5. i want iterate 81 cells , extract digit parts.


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