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qrcode.cpp
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qrcode.cpp
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// This file is part of OpenCV project.
// It is subject to the license terms in the LICENSE file found in the top-level directory
// of this distribution and at http://opencv.org/license.html.
//
// Copyright (C) 2018, Intel Corporation, all rights reserved.
// Third party copyrights are property of their respective owners.
#include "precomp.hpp"
#include "opencv2/objdetect.hpp"
#include "opencv2/calib3d.hpp"
#ifdef HAVE_QUIRC
#include "quirc.h"
#endif
#include <limits>
#include <cmath>
#include <iostream>
#include <queue>
#include <limits>
#include <map>
namespace cv
{
using std::vector;
static bool checkQRInputImage(InputArray img, Mat& gray)
{
CV_Assert(!img.empty());
CV_CheckDepthEQ(img.depth(), CV_8U, "");
if (img.cols() <= 20 || img.rows() <= 20)
{
return false; // image data is not enough for providing reliable results
}
int incn = img.channels();
CV_Check(incn, incn == 1 || incn == 3 || incn == 4, "");
if (incn == 3 || incn == 4)
{
cvtColor(img, gray, COLOR_BGR2GRAY);
}
else
{
gray = img.getMat();
}
return true;
}
static void updatePointsResult(OutputArray points_, const vector<Point2f>& points)
{
if (points_.needed())
{
int N = int(points.size() / 4);
if (N > 0)
{
Mat m_p(N, 4, CV_32FC2, (void*)&points[0]);
int points_type = points_.fixedType() ? points_.type() : CV_32FC2;
m_p.reshape(2, points_.rows()).convertTo(points_, points_type); // Mat layout: N x 4 x 2cn
}
else
{
points_.release();
}
}
}
static Point2f intersectionLines(Point2f a1, Point2f a2, Point2f b1, Point2f b2)
{
const float divisor = (a1.x - a2.x) * (b1.y - b2.y) - (a1.y - a2.y) * (b1.x - b2.x);
const float eps = 0.001f;
if (abs(divisor) < eps)
return a2;
Point2f result_square_angle(
((a1.x * a2.y - a1.y * a2.x) * (b1.x - b2.x) -
(b1.x * b2.y - b1.y * b2.x) * (a1.x - a2.x)) /
divisor,
((a1.x * a2.y - a1.y * a2.x) * (b1.y - b2.y) -
(b1.x * b2.y - b1.y * b2.x) * (a1.y - a2.y)) /
divisor
);
return result_square_angle;
}
// / | b
// / |
// / |
// a/ | c
static inline double getCosVectors(Point2f a, Point2f b, Point2f c)
{
return ((a - b).x * (c - b).x + (a - b).y * (c - b).y) / (norm(a - b) * norm(c - b));
}
static bool arePointsNearest(Point2f a, Point2f b, float delta = 0.0)
{
if ((abs(a.x - b.x) < delta) && (abs(a.y - b.y) < delta))
return true;
else
return false;
}
class QRDetect
{
public:
void init(const Mat& src, double eps_vertical_ = 0.2, double eps_horizontal_ = 0.1);
bool localization();
bool computeTransformationPoints();
Mat getBinBarcode() { return bin_barcode; }
Mat getStraightBarcode() { return straight_barcode; }
vector<Point2f> getTransformationPoints() { return transformation_points; }
protected:
vector<Vec3d> searchHorizontalLines();
vector<Point2f> separateVerticalLines(const vector<Vec3d> &list_lines);
vector<Point2f> extractVerticalLines(const vector<Vec3d> &list_lines, double eps);
void fixationPoints(vector<Point2f> &local_point);
vector<Point2f> getQuadrilateral(vector<Point2f> angle_list);
bool testByPassRoute(vector<Point2f> hull, int start, int finish);
Mat barcode, bin_barcode, resized_barcode, resized_bin_barcode, straight_barcode;
vector<Point2f> localization_points, transformation_points;
double eps_vertical, eps_horizontal, coeff_expansion;
enum resize_direction { ZOOMING, SHRINKING, UNCHANGED } purpose;
};
void QRDetect::init(const Mat& src, double eps_vertical_, double eps_horizontal_)
{
CV_TRACE_FUNCTION();
CV_Assert(!src.empty());
barcode = src.clone();
const double min_side = std::min(src.size().width, src.size().height);
if (min_side < 512.0)
{
purpose = ZOOMING;
coeff_expansion = 512.0 / min_side;
const int width = cvRound(src.size().width * coeff_expansion);
const int height = cvRound(src.size().height * coeff_expansion);
Size new_size(width, height);
resize(src, barcode, new_size, 0, 0, INTER_LINEAR);
}
else if (min_side > 512.0)
{
purpose = SHRINKING;
coeff_expansion = min_side / 512.0;
const int width = cvRound(src.size().width / coeff_expansion);
const int height = cvRound(src.size().height / coeff_expansion);
Size new_size(width, height);
resize(src, resized_barcode, new_size, 0, 0, INTER_AREA);
}
else
{
purpose = UNCHANGED;
coeff_expansion = 1.0;
}
eps_vertical = eps_vertical_;
eps_horizontal = eps_horizontal_;
if (!barcode.empty())
adaptiveThreshold(barcode, bin_barcode, 255, ADAPTIVE_THRESH_GAUSSIAN_C, THRESH_BINARY, 83, 2);
else
bin_barcode.release();
if (!resized_barcode.empty())
adaptiveThreshold(resized_barcode, resized_bin_barcode, 255, ADAPTIVE_THRESH_GAUSSIAN_C, THRESH_BINARY, 83, 2);
else
resized_bin_barcode.release();
}
vector<Vec3d> QRDetect::searchHorizontalLines()
{
CV_TRACE_FUNCTION();
vector<Vec3d> result;
const int height_bin_barcode = bin_barcode.rows;
const int width_bin_barcode = bin_barcode.cols;
const size_t test_lines_size = 5;
double test_lines[test_lines_size];
vector<size_t> pixels_position;
for (int y = 0; y < height_bin_barcode; y++)
{
pixels_position.clear();
const uint8_t *bin_barcode_row = bin_barcode.ptr<uint8_t>(y);
int pos = 0;
for (; pos < width_bin_barcode; pos++) { if (bin_barcode_row[pos] == 0) break; }
if (pos == width_bin_barcode) { continue; }
pixels_position.push_back(pos);
pixels_position.push_back(pos);
pixels_position.push_back(pos);
uint8_t future_pixel = 255;
for (int x = pos; x < width_bin_barcode; x++)
{
if (bin_barcode_row[x] == future_pixel)
{
future_pixel = static_cast<uint8_t>(~future_pixel);
pixels_position.push_back(x);
}
}
pixels_position.push_back(width_bin_barcode - 1);
for (size_t i = 2; i < pixels_position.size() - 3; i+=2)
{
test_lines[0] = static_cast<double>(pixels_position[i - 1] - pixels_position[i - 2]);
test_lines[1] = static_cast<double>(pixels_position[i ] - pixels_position[i - 1]);
test_lines[2] = static_cast<double>(pixels_position[i + 1] - pixels_position[i ]);
test_lines[3] = static_cast<double>(pixels_position[i + 2] - pixels_position[i + 1]);
test_lines[4] = static_cast<double>(pixels_position[i + 3] - pixels_position[i + 2]);
double length = 0.0, weight = 0.0; // TODO avoid 'double' calculations
for (size_t j = 0; j < test_lines_size; j++) { length += test_lines[j]; }
if (length == 0) { continue; }
for (size_t j = 0; j < test_lines_size; j++)
{
if (j != 2) { weight += fabs((test_lines[j] / length) - 1.0/7.0); }
else { weight += fabs((test_lines[j] / length) - 3.0/7.0); }
}
if (weight < eps_vertical)
{
Vec3d line;
line[0] = static_cast<double>(pixels_position[i - 2]);
line[1] = y;
line[2] = length;
result.push_back(line);
}
}
}
return result;
}
vector<Point2f> QRDetect::separateVerticalLines(const vector<Vec3d> &list_lines)
{
CV_TRACE_FUNCTION();
const double min_dist_between_points = 10.0;
const double max_ratio = 1.0;
for (int coeff_epsilon_i = 1; coeff_epsilon_i < 101; ++coeff_epsilon_i)
{
const float coeff_epsilon = coeff_epsilon_i * 0.1f;
vector<Point2f> point2f_result = extractVerticalLines(list_lines, eps_horizontal * coeff_epsilon);
if (!point2f_result.empty())
{
vector<Point2f> centers;
Mat labels;
double compactness = kmeans(
point2f_result, 3, labels,
TermCriteria(TermCriteria::EPS + TermCriteria::COUNT, 10, 0.1),
3, KMEANS_PP_CENTERS, centers);
double min_dist = std::numeric_limits<double>::max();
for (size_t i = 0; i < centers.size(); i++)
{
double dist = norm(centers[i] - centers[(i+1) % centers.size()]);
if (dist < min_dist)
{
min_dist = dist;
}
}
if (min_dist < min_dist_between_points)
{
continue;
}
double mean_compactness = compactness / point2f_result.size();
double ratio = mean_compactness / min_dist;
if (ratio < max_ratio)
{
return point2f_result;
}
}
}
return vector<Point2f>(); // nothing
}
vector<Point2f> QRDetect::extractVerticalLines(const vector<Vec3d> &list_lines, double eps)
{
CV_TRACE_FUNCTION();
vector<Vec3d> result;
vector<double> test_lines; test_lines.reserve(6);
for (size_t pnt = 0; pnt < list_lines.size(); pnt++)
{
const int x = cvRound(list_lines[pnt][0] + list_lines[pnt][2] * 0.5);
const int y = cvRound(list_lines[pnt][1]);
// --------------- Search vertical up-lines --------------- //
test_lines.clear();
uint8_t future_pixel_up = 255;
int temp_length_up = 0;
for (int j = y; j < bin_barcode.rows - 1; j++)
{
uint8_t next_pixel = bin_barcode.ptr<uint8_t>(j + 1)[x];
temp_length_up++;
if (next_pixel == future_pixel_up)
{
future_pixel_up = static_cast<uint8_t>(~future_pixel_up);
test_lines.push_back(temp_length_up);
temp_length_up = 0;
if (test_lines.size() == 3)
break;
}
}
// --------------- Search vertical down-lines --------------- //
int temp_length_down = 0;
uint8_t future_pixel_down = 255;
for (int j = y; j >= 1; j--)
{
uint8_t next_pixel = bin_barcode.ptr<uint8_t>(j - 1)[x];
temp_length_down++;
if (next_pixel == future_pixel_down)
{
future_pixel_down = static_cast<uint8_t>(~future_pixel_down);
test_lines.push_back(temp_length_down);
temp_length_down = 0;
if (test_lines.size() == 6)
break;
}
}
// --------------- Compute vertical lines --------------- //
if (test_lines.size() == 6)
{
double length = 0.0, weight = 0.0; // TODO avoid 'double' calculations
for (size_t i = 0; i < test_lines.size(); i++)
length += test_lines[i];
CV_Assert(length > 0);
for (size_t i = 0; i < test_lines.size(); i++)
{
if (i % 3 != 0)
{
weight += fabs((test_lines[i] / length) - 1.0/ 7.0);
}
else
{
weight += fabs((test_lines[i] / length) - 3.0/14.0);
}
}
if (weight < eps)
{
result.push_back(list_lines[pnt]);
}
}
}
vector<Point2f> point2f_result;
if (result.size() > 2)
{
for (size_t i = 0; i < result.size(); i++)
{
point2f_result.push_back(
Point2f(static_cast<float>(result[i][0] + result[i][2] * 0.5),
static_cast<float>(result[i][1])));
}
}
return point2f_result;
}
void QRDetect::fixationPoints(vector<Point2f> &local_point)
{
CV_TRACE_FUNCTION();
double cos_angles[3], norm_triangl[3];
norm_triangl[0] = norm(local_point[1] - local_point[2]);
norm_triangl[1] = norm(local_point[0] - local_point[2]);
norm_triangl[2] = norm(local_point[1] - local_point[0]);
cos_angles[0] = (norm_triangl[1] * norm_triangl[1] + norm_triangl[2] * norm_triangl[2]
- norm_triangl[0] * norm_triangl[0]) / (2 * norm_triangl[1] * norm_triangl[2]);
cos_angles[1] = (norm_triangl[0] * norm_triangl[0] + norm_triangl[2] * norm_triangl[2]
- norm_triangl[1] * norm_triangl[1]) / (2 * norm_triangl[0] * norm_triangl[2]);
cos_angles[2] = (norm_triangl[0] * norm_triangl[0] + norm_triangl[1] * norm_triangl[1]
- norm_triangl[2] * norm_triangl[2]) / (2 * norm_triangl[0] * norm_triangl[1]);
const double angle_barrier = 0.85;
if (fabs(cos_angles[0]) > angle_barrier || fabs(cos_angles[1]) > angle_barrier || fabs(cos_angles[2]) > angle_barrier)
{
local_point.clear();
return;
}
size_t i_min_cos =
(cos_angles[0] < cos_angles[1] && cos_angles[0] < cos_angles[2]) ? 0 :
(cos_angles[1] < cos_angles[0] && cos_angles[1] < cos_angles[2]) ? 1 : 2;
size_t index_max = 0;
double max_area = std::numeric_limits<double>::min();
for (size_t i = 0; i < local_point.size(); i++)
{
const size_t current_index = i % 3;
const size_t left_index = (i + 1) % 3;
const size_t right_index = (i + 2) % 3;
const Point2f current_point(local_point[current_index]),
left_point(local_point[left_index]), right_point(local_point[right_index]),
central_point(intersectionLines(current_point,
Point2f(static_cast<float>((local_point[left_index].x + local_point[right_index].x) * 0.5),
static_cast<float>((local_point[left_index].y + local_point[right_index].y) * 0.5)),
Point2f(0, static_cast<float>(bin_barcode.rows - 1)),
Point2f(static_cast<float>(bin_barcode.cols - 1),
static_cast<float>(bin_barcode.rows - 1))));
vector<Point2f> list_area_pnt;
list_area_pnt.push_back(current_point);
vector<LineIterator> list_line_iter;
list_line_iter.push_back(LineIterator(bin_barcode, current_point, left_point));
list_line_iter.push_back(LineIterator(bin_barcode, current_point, central_point));
list_line_iter.push_back(LineIterator(bin_barcode, current_point, right_point));
for (size_t k = 0; k < list_line_iter.size(); k++)
{
LineIterator& li = list_line_iter[k];
uint8_t future_pixel = 255, count_index = 0;
for(int j = 0; j < li.count; j++, ++li)
{
const Point p = li.pos();
if (p.x >= bin_barcode.cols ||
p.y >= bin_barcode.rows)
{
break;
}
const uint8_t value = bin_barcode.at<uint8_t>(p);
if (value == future_pixel)
{
future_pixel = static_cast<uint8_t>(~future_pixel);
count_index++;
if (count_index == 3)
{
list_area_pnt.push_back(p);
break;
}
}
}
}
const double temp_check_area = contourArea(list_area_pnt);
if (temp_check_area > max_area)
{
index_max = current_index;
max_area = temp_check_area;
}
}
if (index_max == i_min_cos) { std::swap(local_point[0], local_point[index_max]); }
else { local_point.clear(); return; }
const Point2f rpt = local_point[0], bpt = local_point[1], gpt = local_point[2];
Matx22f m(rpt.x - bpt.x, rpt.y - bpt.y, gpt.x - rpt.x, gpt.y - rpt.y);
if( determinant(m) > 0 )
{
std::swap(local_point[1], local_point[2]);
}
}
bool QRDetect::localization()
{
CV_TRACE_FUNCTION();
Point2f begin, end;
vector<Vec3d> list_lines_x = searchHorizontalLines();
if( list_lines_x.empty() ) { return false; }
vector<Point2f> list_lines_y = separateVerticalLines(list_lines_x);
if( list_lines_y.empty() ) { return false; }
Mat labels;
kmeans(list_lines_y, 3, labels,
TermCriteria( TermCriteria::EPS + TermCriteria::COUNT, 10, 0.1),
3, KMEANS_PP_CENTERS, localization_points);
fixationPoints(localization_points);
bool square_flag = false, local_points_flag = false;
double triangle_sides[3];
double triangle_perim, square_area, img_square_area;
if (localization_points.size() == 3)
{
triangle_sides[0] = norm(localization_points[0] - localization_points[1]);
triangle_sides[1] = norm(localization_points[1] - localization_points[2]);
triangle_sides[2] = norm(localization_points[2] - localization_points[0]);
triangle_perim = (triangle_sides[0] + triangle_sides[1] + triangle_sides[2]) / 2;
square_area = sqrt((triangle_perim * (triangle_perim - triangle_sides[0])
* (triangle_perim - triangle_sides[1])
* (triangle_perim - triangle_sides[2]))) * 2;
img_square_area = bin_barcode.cols * bin_barcode.rows;
if (square_area > (img_square_area * 0.2))
{
square_flag = true;
}
}
else
{
local_points_flag = true;
}
if ((square_flag || local_points_flag) && purpose == SHRINKING)
{
localization_points.clear();
bin_barcode = resized_bin_barcode.clone();
list_lines_x = searchHorizontalLines();
if( list_lines_x.empty() ) { return false; }
list_lines_y = separateVerticalLines(list_lines_x);
if( list_lines_y.empty() ) { return false; }
kmeans(list_lines_y, 3, labels,
TermCriteria( TermCriteria::EPS + TermCriteria::COUNT, 10, 0.1),
3, KMEANS_PP_CENTERS, localization_points);
fixationPoints(localization_points);
if (localization_points.size() != 3) { return false; }
const int width = cvRound(bin_barcode.size().width * coeff_expansion);
const int height = cvRound(bin_barcode.size().height * coeff_expansion);
Size new_size(width, height);
Mat intermediate;
resize(bin_barcode, intermediate, new_size, 0, 0, INTER_LINEAR);
bin_barcode = intermediate.clone();
for (size_t i = 0; i < localization_points.size(); i++)
{
localization_points[i] *= coeff_expansion;
}
}
if (purpose == ZOOMING)
{
const int width = cvRound(bin_barcode.size().width / coeff_expansion);
const int height = cvRound(bin_barcode.size().height / coeff_expansion);
Size new_size(width, height);
Mat intermediate;
resize(bin_barcode, intermediate, new_size, 0, 0, INTER_LINEAR);
bin_barcode = intermediate.clone();
for (size_t i = 0; i < localization_points.size(); i++)
{
localization_points[i] /= coeff_expansion;
}
}
for (size_t i = 0; i < localization_points.size(); i++)
{
for (size_t j = i + 1; j < localization_points.size(); j++)
{
if (norm(localization_points[i] - localization_points[j]) < 10)
{
return false;
}
}
}
return true;
}
bool QRDetect::computeTransformationPoints()
{
CV_TRACE_FUNCTION();
if (localization_points.size() != 3) { return false; }
vector<Point> locations, non_zero_elem[3], newHull;
vector<Point2f> new_non_zero_elem[3];
for (size_t i = 0; i < 3; i++)
{
Mat mask = Mat::zeros(bin_barcode.rows + 2, bin_barcode.cols + 2, CV_8UC1);
uint8_t next_pixel, future_pixel = 255;
int count_test_lines = 0, index = cvRound(localization_points[i].x);
for (; index < bin_barcode.cols - 1; index++)
{
next_pixel = bin_barcode.ptr<uint8_t>(cvRound(localization_points[i].y))[index + 1];
if (next_pixel == future_pixel)
{
future_pixel = static_cast<uint8_t>(~future_pixel);
count_test_lines++;
if (count_test_lines == 2)
{
floodFill(bin_barcode, mask,
Point(index + 1, cvRound(localization_points[i].y)), 255,
0, Scalar(), Scalar(), FLOODFILL_MASK_ONLY);
break;
}
}
}
Mat mask_roi = mask(Range(1, bin_barcode.rows - 1), Range(1, bin_barcode.cols - 1));
findNonZero(mask_roi, non_zero_elem[i]);
newHull.insert(newHull.end(), non_zero_elem[i].begin(), non_zero_elem[i].end());
}
convexHull(newHull, locations);
for (size_t i = 0; i < locations.size(); i++)
{
for (size_t j = 0; j < 3; j++)
{
for (size_t k = 0; k < non_zero_elem[j].size(); k++)
{
if (locations[i] == non_zero_elem[j][k])
{
new_non_zero_elem[j].push_back(locations[i]);
}
}
}
}
double pentagon_diag_norm = -1;
Point2f down_left_edge_point, up_right_edge_point, up_left_edge_point;
for (size_t i = 0; i < new_non_zero_elem[1].size(); i++)
{
for (size_t j = 0; j < new_non_zero_elem[2].size(); j++)
{
double temp_norm = norm(new_non_zero_elem[1][i] - new_non_zero_elem[2][j]);
if (temp_norm > pentagon_diag_norm)
{
down_left_edge_point = new_non_zero_elem[1][i];
up_right_edge_point = new_non_zero_elem[2][j];
pentagon_diag_norm = temp_norm;
}
}
}
if (down_left_edge_point == Point2f(0, 0) ||
up_right_edge_point == Point2f(0, 0) ||
new_non_zero_elem[0].size() == 0) { return false; }
double max_area = -1;
up_left_edge_point = new_non_zero_elem[0][0];
for (size_t i = 0; i < new_non_zero_elem[0].size(); i++)
{
vector<Point2f> list_edge_points;
list_edge_points.push_back(new_non_zero_elem[0][i]);
list_edge_points.push_back(down_left_edge_point);
list_edge_points.push_back(up_right_edge_point);
double temp_area = fabs(contourArea(list_edge_points));
if (max_area < temp_area)
{
up_left_edge_point = new_non_zero_elem[0][i];
max_area = temp_area;
}
}
Point2f down_max_delta_point, up_max_delta_point;
double norm_down_max_delta = -1, norm_up_max_delta = -1;
for (size_t i = 0; i < new_non_zero_elem[1].size(); i++)
{
double temp_norm_delta = norm(up_left_edge_point - new_non_zero_elem[1][i])
+ norm(down_left_edge_point - new_non_zero_elem[1][i]);
if (norm_down_max_delta < temp_norm_delta)
{
down_max_delta_point = new_non_zero_elem[1][i];
norm_down_max_delta = temp_norm_delta;
}
}
for (size_t i = 0; i < new_non_zero_elem[2].size(); i++)
{
double temp_norm_delta = norm(up_left_edge_point - new_non_zero_elem[2][i])
+ norm(up_right_edge_point - new_non_zero_elem[2][i]);
if (norm_up_max_delta < temp_norm_delta)
{
up_max_delta_point = new_non_zero_elem[2][i];
norm_up_max_delta = temp_norm_delta;
}
}
transformation_points.push_back(down_left_edge_point);
transformation_points.push_back(up_left_edge_point);
transformation_points.push_back(up_right_edge_point);
transformation_points.push_back(
intersectionLines(down_left_edge_point, down_max_delta_point,
up_right_edge_point, up_max_delta_point));
vector<Point2f> quadrilateral = getQuadrilateral(transformation_points);
transformation_points = quadrilateral;
int width = bin_barcode.size().width;
int height = bin_barcode.size().height;
for (size_t i = 0; i < transformation_points.size(); i++)
{
if ((cvRound(transformation_points[i].x) > width) ||
(cvRound(transformation_points[i].y) > height)) { return false; }
}
return true;
}
// test function (if true then ------> else <------ )
bool QRDetect::testByPassRoute(vector<Point2f> hull, int start, int finish)
{
CV_TRACE_FUNCTION();
int index_hull = start, next_index_hull, hull_size = (int)hull.size();
double test_length[2] = { 0.0, 0.0 };
do
{
next_index_hull = index_hull + 1;
if (next_index_hull == hull_size) { next_index_hull = 0; }
test_length[0] += norm(hull[index_hull] - hull[next_index_hull]);
index_hull = next_index_hull;
}
while(index_hull != finish);
index_hull = start;
do
{
next_index_hull = index_hull - 1;
if (next_index_hull == -1) { next_index_hull = hull_size - 1; }
test_length[1] += norm(hull[index_hull] - hull[next_index_hull]);
index_hull = next_index_hull;
}
while(index_hull != finish);
if (test_length[0] < test_length[1]) { return true; } else { return false; }
}
vector<Point2f> QRDetect::getQuadrilateral(vector<Point2f> angle_list)
{
CV_TRACE_FUNCTION();
size_t angle_size = angle_list.size();
uint8_t value, mask_value;
Mat mask = Mat::zeros(bin_barcode.rows + 2, bin_barcode.cols + 2, CV_8UC1);
Mat fill_bin_barcode = bin_barcode.clone();
for (size_t i = 0; i < angle_size; i++)
{
LineIterator line_iter(bin_barcode, angle_list[ i % angle_size],
angle_list[(i + 1) % angle_size]);
for(int j = 0; j < line_iter.count; j++, ++line_iter)
{
Point p = line_iter.pos();
value = bin_barcode.at<uint8_t>(p);
mask_value = mask.at<uint8_t>(p + Point(1, 1));
if (value == 0 && mask_value == 0)
{
floodFill(fill_bin_barcode, mask, p, 255,
0, Scalar(), Scalar(), FLOODFILL_MASK_ONLY);
}
}
}
vector<Point> locations;
Mat mask_roi = mask(Range(1, bin_barcode.rows - 1), Range(1, bin_barcode.cols - 1));
findNonZero(mask_roi, locations);
for (size_t i = 0; i < angle_list.size(); i++)
{
int x = cvRound(angle_list[i].x);
int y = cvRound(angle_list[i].y);
locations.push_back(Point(x, y));
}
vector<Point> integer_hull;
convexHull(locations, integer_hull);
int hull_size = (int)integer_hull.size();
vector<Point2f> hull(hull_size);
for (int i = 0; i < hull_size; i++)
{
float x = saturate_cast<float>(integer_hull[i].x);
float y = saturate_cast<float>(integer_hull[i].y);
hull[i] = Point2f(x, y);
}
const double experimental_area = fabs(contourArea(hull));
vector<Point2f> result_hull_point(angle_size);
double min_norm;
for (size_t i = 0; i < angle_size; i++)
{
min_norm = std::numeric_limits<double>::max();
Point closest_pnt;
for (int j = 0; j < hull_size; j++)
{
double temp_norm = norm(hull[j] - angle_list[i]);
if (min_norm > temp_norm)
{
min_norm = temp_norm;
closest_pnt = hull[j];
}
}
result_hull_point[i] = closest_pnt;
}
int start_line[2] = { 0, 0 }, finish_line[2] = { 0, 0 }, unstable_pnt = 0;
for (int i = 0; i < hull_size; i++)
{
if (result_hull_point[2] == hull[i]) { start_line[0] = i; }
if (result_hull_point[1] == hull[i]) { finish_line[0] = start_line[1] = i; }
if (result_hull_point[0] == hull[i]) { finish_line[1] = i; }
if (result_hull_point[3] == hull[i]) { unstable_pnt = i; }
}
int index_hull, extra_index_hull, next_index_hull, extra_next_index_hull;
Point result_side_begin[4], result_side_end[4];
bool bypass_orientation = testByPassRoute(hull, start_line[0], finish_line[0]);
min_norm = std::numeric_limits<double>::max();
index_hull = start_line[0];
do
{
if (bypass_orientation) { next_index_hull = index_hull + 1; }
else { next_index_hull = index_hull - 1; }
if (next_index_hull == hull_size) { next_index_hull = 0; }
if (next_index_hull == -1) { next_index_hull = hull_size - 1; }
Point angle_closest_pnt = norm(hull[index_hull] - angle_list[1]) >
norm(hull[index_hull] - angle_list[2]) ? angle_list[2] : angle_list[1];
Point intrsc_line_hull =
intersectionLines(hull[index_hull], hull[next_index_hull],
angle_list[1], angle_list[2]);
double temp_norm = getCosVectors(hull[index_hull], intrsc_line_hull, angle_closest_pnt);
if (min_norm > temp_norm &&
norm(hull[index_hull] - hull[next_index_hull]) >
norm(angle_list[1] - angle_list[2]) * 0.1)
{
min_norm = temp_norm;
result_side_begin[0] = hull[index_hull];
result_side_end[0] = hull[next_index_hull];
}
index_hull = next_index_hull;
}
while(index_hull != finish_line[0]);
if (min_norm == std::numeric_limits<double>::max())
{
result_side_begin[0] = angle_list[1];
result_side_end[0] = angle_list[2];
}
min_norm = std::numeric_limits<double>::max();
index_hull = start_line[1];
bypass_orientation = testByPassRoute(hull, start_line[1], finish_line[1]);
do
{
if (bypass_orientation) { next_index_hull = index_hull + 1; }
else { next_index_hull = index_hull - 1; }
if (next_index_hull == hull_size) { next_index_hull = 0; }
if (next_index_hull == -1) { next_index_hull = hull_size - 1; }
Point angle_closest_pnt = norm(hull[index_hull] - angle_list[0]) >
norm(hull[index_hull] - angle_list[1]) ? angle_list[1] : angle_list[0];
Point intrsc_line_hull =
intersectionLines(hull[index_hull], hull[next_index_hull],
angle_list[0], angle_list[1]);
double temp_norm = getCosVectors(hull[index_hull], intrsc_line_hull, angle_closest_pnt);
if (min_norm > temp_norm &&
norm(hull[index_hull] - hull[next_index_hull]) >
norm(angle_list[0] - angle_list[1]) * 0.05)
{
min_norm = temp_norm;
result_side_begin[1] = hull[index_hull];
result_side_end[1] = hull[next_index_hull];
}
index_hull = next_index_hull;
}
while(index_hull != finish_line[1]);
if (min_norm == std::numeric_limits<double>::max())
{
result_side_begin[1] = angle_list[0];
result_side_end[1] = angle_list[1];
}
bypass_orientation = testByPassRoute(hull, start_line[0], unstable_pnt);
const bool extra_bypass_orientation = testByPassRoute(hull, finish_line[1], unstable_pnt);
vector<Point2f> result_angle_list(4), test_result_angle_list(4);
double min_diff_area = std::numeric_limits<double>::max();
index_hull = start_line[0];
const double standart_norm = std::max(
norm(result_side_begin[0] - result_side_end[0]),
norm(result_side_begin[1] - result_side_end[1]));
do
{
if (bypass_orientation) { next_index_hull = index_hull + 1; }
else { next_index_hull = index_hull - 1; }
if (next_index_hull == hull_size) { next_index_hull = 0; }
if (next_index_hull == -1) { next_index_hull = hull_size - 1; }
if (norm(hull[index_hull] - hull[next_index_hull]) < standart_norm * 0.1)
{ index_hull = next_index_hull; continue; }
extra_index_hull = finish_line[1];
do
{
if (extra_bypass_orientation) { extra_next_index_hull = extra_index_hull + 1; }
else { extra_next_index_hull = extra_index_hull - 1; }
if (extra_next_index_hull == hull_size) { extra_next_index_hull = 0; }
if (extra_next_index_hull == -1) { extra_next_index_hull = hull_size - 1; }
if (norm(hull[extra_index_hull] - hull[extra_next_index_hull]) < standart_norm * 0.1)
{ extra_index_hull = extra_next_index_hull; continue; }
test_result_angle_list[0]
= intersectionLines(result_side_begin[0], result_side_end[0],
result_side_begin[1], result_side_end[1]);
test_result_angle_list[1]
= intersectionLines(result_side_begin[1], result_side_end[1],
hull[extra_index_hull], hull[extra_next_index_hull]);
test_result_angle_list[2]
= intersectionLines(hull[extra_index_hull], hull[extra_next_index_hull],
hull[index_hull], hull[next_index_hull]);
test_result_angle_list[3]
= intersectionLines(hull[index_hull], hull[next_index_hull],
result_side_begin[0], result_side_end[0]);
const double test_diff_area
= fabs(fabs(contourArea(test_result_angle_list)) - experimental_area);
if (min_diff_area > test_diff_area)
{
min_diff_area = test_diff_area;
for (size_t i = 0; i < test_result_angle_list.size(); i++)
{
result_angle_list[i] = test_result_angle_list[i];
}
}
extra_index_hull = extra_next_index_hull;
}
while(extra_index_hull != unstable_pnt);
index_hull = next_index_hull;
}
while(index_hull != unstable_pnt);
// check label points
if (norm(result_angle_list[0] - angle_list[1]) > 2) { result_angle_list[0] = angle_list[1]; }
if (norm(result_angle_list[1] - angle_list[0]) > 2) { result_angle_list[1] = angle_list[0]; }
if (norm(result_angle_list[3] - angle_list[2]) > 2) { result_angle_list[3] = angle_list[2]; }
// check calculation point
if (norm(result_angle_list[2] - angle_list[3]) >
(norm(result_angle_list[0] - result_angle_list[1]) +
norm(result_angle_list[0] - result_angle_list[3])) * 0.5 )
{ result_angle_list[2] = angle_list[3]; }
return result_angle_list;
}
struct QRCodeDetector::Impl
{
public:
Impl() { epsX = 0.2; epsY = 0.1; }
~Impl() {}
double epsX, epsY;
};
QRCodeDetector::QRCodeDetector() : p(new Impl) {}
QRCodeDetector::~QRCodeDetector() {}
void QRCodeDetector::setEpsX(double epsX) { p->epsX = epsX; }
void QRCodeDetector::setEpsY(double epsY) { p->epsY = epsY; }
bool QRCodeDetector::detect(InputArray in, OutputArray points) const
{
Mat inarr;
if (!checkQRInputImage(in, inarr))
return false;
QRDetect qrdet;
qrdet.init(inarr, p->epsX, p->epsY);
if (!qrdet.localization()) { return false; }
if (!qrdet.computeTransformationPoints()) { return false; }
vector<Point2f> pnts2f = qrdet.getTransformationPoints();
updatePointsResult(points, pnts2f);
return true;
}
class QRDecode
{
public:
void init(const Mat &src, const vector<Point2f> &points);
Mat getIntermediateBarcode() { return intermediate; }
Mat getStraightBarcode() { return straight; }
size_t getVersion() { return version; }
std::string getDecodeInformation() { return result_info; }
bool straightDecodingProcess();
bool curvedDecodingProcess();
protected:
bool updatePerspective();
bool versionDefinition();
bool samplingForVersion();
bool decodingProcess();
inline double pointPosition(Point2f a, Point2f b , Point2f c);
float distancePointToLine(Point2f a, Point2f b , Point2f c);
void getPointsInsideQRCode(const vector<Point2f> &angle_list);
bool computeClosestPoints(const vector<Point> &result_integer_hull);
bool computeSidesPoints(const vector<Point> &result_integer_hull);