Re: [Bug-ocrad] Question about OCRad

[Antonio Diaz Diaz]

SOUA, Mahmoud wrote:
> Thanks for your quick answer. I saw this function, of otsu_th. But i can't
> find where you modifie the data pixels to the binary form based on the otsu
> threshold.

Modifying the data pixels destroys information. Ocrad is more clever 
than that.

The real binarization happens at 'get_bit' functions (page_image.h lines 
68-71):

  bool get_bit( const int row, const int col ) const
    { return data[row-top()][col-left()] <= threshold_; }
  bool get_bit( const int row, const int col, const uint8_t th ) const
    { return data[row-top()][col-left()] <= th; }

This allows the recalculation of the threshold or even the application 
of different thresholds to different parts of the image.


Best regards,
Antonio.