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/*
* Copyright (C) 2007 - 2008 Lars Kuhtz, ExactCODE GmbH Germany.
* Copyright (C) 2009 - 2019 René Rebe, ExactCODE GmbH Germany.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2. A copy of the GNU General
* Public License can be found in the file LICENSE.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANT-
* ABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
* Public License for more details.
*
* Alternatively, commercial licensing options are available from the
* copyright holder ExactCODE GmbH Germany.
*/
#ifndef _TOKENIZER_HH_
#define _TOKENIZER_HH_
#include <utility>
#include <assert.h>
#include <math.h>
#include <algorithm>
#include "Image.hh"
#include "PixelIterator.hh"
namespace BarDecode
{
// Shall we include absolut position?
typedef std::pair<bool, unsigned> token_t; // (color,length in pixels)
typedef bool module_t;
typedef double unit_t;
template<bool vertical = false>
class Tokenizer
{
public:
Tokenizer(const Image* img, int concurrent_lines = 4, int line_skip = 8, threshold_t threshold = 150) :
img(img),
it(img,concurrent_lines,line_skip,threshold),
extra(0),
initial_threshold(threshold)
{}
virtual ~Tokenizer() {}
void next_line(std::vector<token_t>& result)
{
assert(! end());
assert(vertical ? it.get_y() == 0 : it.get_x() == 0);
result.clear();
it.set_threshold(initial_threshold);
//std::cerr << "========== 0 " << it.get_threshold() << std::endl;
bool color = *it;
double count = 1;
double lum;
#define DYNAMIC_THRESHOLD
#ifdef DYNAMIC_THRESHOLD
double sum = 0;
#endif
double old_mean = it.get_lum();
for (long i = 0; i < it.get_line_length(); ++i,++it,++count) {
lum = it.get_lum();
#ifdef DYNAMIC_THRESHOLD
sum += lum;
#endif
#ifdef DYNAMIC_THRESHOLD
double mean = sum / count;
//std::cerr << "---------------- lum=" << lum << " sum=" << sum << " count=" << count << " mean=" << mean << std::endl;
static const int contrast_threshold = 30;
if ( ! color && lum > it.get_threshold() && lum < mean - contrast_threshold) {
//it.set_threshold(lround(std::max((double)it.get_threshold(),std::min((mean - contrast_threshold)/2,220.0))));
it.set_threshold(lround(std::min((mean - contrast_threshold),220.0)));
} else if ( ! color && lum > it.get_threshold() && (old_mean && lum < old_mean - (contrast_threshold+10))) {
it.set_threshold(lround(std::min((old_mean - (contrast_threshold+10)),220.0)));
} else if ( color && lum < it.get_threshold() && (lum > mean + contrast_threshold)) {
//it.set_threshold(lround(std::min((double)it.get_threshold(),std::max((mean + contrast_threshold)/2,80.0))));
it.set_threshold(lround(std::max((mean + contrast_threshold),80.0)));
} else if ( color && lum < it.get_threshold() && (old_mean && lum > old_mean + contrast_threshold+10)) {
it.set_threshold(lround(std::max((old_mean + contrast_threshold+10),80.0)));
}
#if 1
//else if ( color && count > 20 && lum < it.get_threshold() && lum < mean - contrast_threshold && it.get_threshold() > initial_threshold) {
else if ( color && count > 20 && lum < it.get_threshold() && lum < mean - contrast_threshold /*&& it.get_threshold() > initial_threshold*/) {
color = false;
it.set_threshold(lround(mean - contrast_threshold));
//it.set_threshold(initial_threshold);
} else if ( color && count > 20 && lum < it.get_threshold() && lum < old_mean - (contrast_threshold+10) /*&& it.get_threshold() > initial_threshold*/) {
color = false;
it.set_threshold(lround(old_mean - (contrast_threshold+10)));
//it.set_threshold(initial_threshold);
}
old_mean = mean;
#endif
//mean = ( *it ? std::min(mean,lum) : std::max(mean,lum));
#endif
if (color != *it || i == it.get_line_length()-1) {
#define SUBPIXEL_ADJUST
#ifdef SUBPIXEL_ADJUST
count -= extra;
double extra = ( ! color ? (lum / 255.0) : (1- (lum / 255.0)));
count += extra;
extra = 1 - extra;
#endif
result.push_back(token_t(color,lround(count)));
#define DYNAMIC_THRESHOLD
#ifdef DYNAMIC_THRESHOLD
sum = 0;
#endif
count = 0;
color = *it;
}
}
}
// precondition: ! end()
// FIXME use extra only if u is small enough such that subpixel dimensions matter
token_t next()
{
assert(! end());
#define DYNAMIC_THRESHOLD
#ifdef DYNAMIC_THRESHOLD
double sum = 0;
#endif
double count = 0;
bool color = *it; // TODO simple alternation would safe the call of operator*
double lum = it.get_lum();
//double mean = lum;
do {
#ifdef DYNAMIC_THRESHOLD
sum += lum;
#endif
++count;
++it;
lum = it.get_lum();
#ifdef DYNAMIC_THRESHOLD
double mean = sum / count;
static const int contrast_threshold = 50;
if ( ! color && lum > it.get_threshold() && lum < mean - contrast_threshold) {
// std::cerr << "0 adjust from " << it.get_threshold() << " to ";
//it.set_threshold(lround(std::max((double)it.get_threshold(),std::min((mean - contrast_threshold)/2,220.0))));
it.set_threshold(lround(std::min((mean - contrast_threshold),220.0)));
//std::cerr << it.get_threshold() << std::endl;
break;
} else if ( color && lum < it.get_threshold() && lum > mean + contrast_threshold) {
//std::cerr << "1 adjust from " << it.get_threshold() << " to ";
//it.set_threshold(lround(std::min((double)it.get_threshold(),std::max((mean + contrast_threshold)/2,80.0))));
it.set_threshold(lround(std::max((mean + contrast_threshold),80.0)));
//std::cerr << it.get_threshold() << std::endl;
break;
}
#if 1
else if ( color && count > 10 && lum < it.get_threshold() && lum < mean - contrast_threshold /* && it.get_threshold() > initial_threshold*/) {
color = false;
// std::cerr << "2 adjust from " << it.get_threshold() << " to ";
it.set_threshold(lround(mean - contrast_threshold));
//it.set_threshold(initial_threshold);
//std::cerr << it.get_threshold() << std::endl;
//break;
}
#endif
//mean = ( *it ? std::min(mean,lum) : std::max(mean,lum));
#endif
} while ( ! end() && color == *it );
#define SUBPIXEL_ADJUST
#ifdef SUBPIXEL_ADJUST
count -= extra;
double extra = ( ! color ? (lum / 255.0) : (1- (lum / 255.0)));
count += extra;
extra = 1 - extra;
#endif
return token_t(color,lround(count));
}
bool end() const { return it.end(); }
threshold_t get_threshold() const { return it.get_threshold(); }
void set_threshold(threshold_t new_threshold)
{
it.set_threshold(new_threshold);
}
pos_t get_x() const { return it.get_x(); }
pos_t get_y() const { return it.get_y(); }
const Image* get_img() const { return img; }
Tokenizer at(pos_t x, pos_t y) const
{
Tokenizer tmp = *this;
tmp.it = it.at(x,y);
return tmp;
}
protected:
const Image* img;
PixelIterator<vertical> it;
#ifdef SUBPIXEL_ADJUST
double extra;
#endif
threshold_t initial_threshold;
};
}; // namespace BarDecode
#endif // _TOKENIZER_HH_
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