lib/gocr/otsu.h

   1 /*
   2
   3     see README for EMAIL-address
   4
   5  */
   6
   7
   8 /*======================================================================*/
   9 /* OTSU global thresholding routine                                     */
  10 /*   takes a 2D unsigned char array pointer, number of rows, and        */
  11 /*   number of cols in the array. returns the value of the threshold    */
  12 /*======================================================================*/
  13 int
  14 otsu (unsigned char *image, int rows, int cols, int x0, int y0, int dx, int dy, int vvv);
  15
  16
  17 /*======================================================================*/
  18 /* thresholding the image  (set threshold to 128+32=160=0xA0)           */
  19 /*   now we have a fixed thresholdValue good to recognize on gray image */
  20 /*   - so lower bits can used for other things (bad design?)            */
  21 /*======================================================================*/
  22 int
  23 thresholding (unsigned char *image, int rows, int cols, int x0, int y0, int dx, int dy, int thresholdValue);