void ofxOcrad::doOCR()
{
OCRAD_Descriptor * od;
char str[1024];
const unsigned char invert = 1;
int blocknum, linenum;
od = OCRAD_open();
OCRAD_set_image(od, &pixmap, 0);
OCRAD_get_errno(od);
OCRAD_recognize(od, 1);
blocknum = OCRAD_result_blocks(od);
int pos = 0;
for(int i=0; i<blocknum; i++){
linenum = OCRAD_result_lines(od, i);
for(int j=0; j<linenum; j++){
sprintf(&str[pos], "%s\n", OCRAD_result_line(od,i,j));
pos = pos + strlen(OCRAD_result_line(od,i,j));
}
}
strcpy(str_result, str);
OCRAD_close(od);
}
// Function: osra_ocrad_ocr()
// Make an attempt to OCR the image box with OCRAD engine.
//
// Parameters:
// ocrad_pixmap - includes pixel map and the image mode
// char_filter - character filter
//
// Returns:
// 0 in case the recognition failed or valid alphanumeric character
char osra_ocrad_ocr(const OCRAD_Pixmap * const ocrad_pixmap, const string &char_filter)
{
char result = 0;
string line;
OCRAD_Descriptor * const ocrad_res = OCRAD_open();
// If the box height is less than 10px, it should be scaled up a bit, otherwise OCRAD is unable to catch it:
if (ocrad_res && OCRAD_get_errno(ocrad_res) == OCRAD_ok && OCRAD_set_image(ocrad_res, ocrad_pixmap, 0) == 0
&& (ocrad_pixmap->height >= 10 || OCRAD_scale(ocrad_res, 2) == 0) && OCRAD_recognize(ocrad_res, 0) == 0)
{
result = OCRAD_result_first_character(ocrad_res);
if (OCRAD_result_blocks(ocrad_res) >= 1 && OCRAD_result_lines(ocrad_res, 0) && OCRAD_result_line(
ocrad_res, 0, 0) != 0)
line = OCRAD_result_line(ocrad_res, 0, 0);
}
OCRAD_close(ocrad_res);
// TODO: Why line should have 0 or 1 characters? Give examples...
if (line.length() > 2 || !isalnum(result) || (!char_filter.empty() && char_filter.find(result, 0) == string::npos))
return UNKNOWN_CHAR;
return result;
}