opencv/modules/stitching/exposure_compensate.cpp

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/*M///////////////////////////////////////////////////////////////////////////////////////
//
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//
// By downloading, copying, installing or using the software you agree to this license.
// If you do not agree to this license, do not download, install,
// copy or use the software.
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//
// License Agreement
// For Open Source Computer Vision Library
//
// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
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// are permitted provided that the following conditions are met:
//
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//M*/
#include "exposure_compensate.hpp"
#include "util.hpp"
using namespace std;
using namespace cv;
Ptr<ExposureCompensator> ExposureCompensator::createDefault(int type)
{
if (type == NO)
return new NoExposureCompensator();
if (type == OVERLAP)
return new OverlapExposureCompensator();
CV_Error(CV_StsBadArg, "unsupported exposure compensation method");
return NULL;
}
void OverlapExposureCompensator::feed(const vector<Point> &corners, const vector<Mat> &images,
const vector<Mat> &masks)
{
const int num_images = static_cast<int>(images.size());
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Mat_<int> N(num_images, num_images); N.setTo(0);
Mat_<double> I(num_images, num_images); I.setTo(0);
Rect dst_roi = resultRoi(corners, images);
Mat subimg1, subimg2;
Mat_<uchar> submask1, submask2, overlap;
for (int i = 0; i < num_images; ++i)
{
for (int j = i; j < num_images; ++j)
{
Rect roi;
if (overlapRoi(corners[i], corners[j], images[i].size(), images[j].size(), roi))
{
subimg1 = images[i](Rect(roi.tl() - corners[i], roi.br() - corners[i]));
subimg2 = images[j](Rect(roi.tl() - corners[j], roi.br() - corners[j]));
submask1 = masks[i](Rect(roi.tl() - corners[i], roi.br() - corners[i]));
submask2 = masks[j](Rect(roi.tl() - corners[j], roi.br() - corners[j]));
overlap = submask1 & submask2;
N(i, j) = N(j, i) = countNonZero(overlap);
double Isum1 = 0, Isum2 = 0;
for (int y = 0; y < roi.height; ++y)
{
const Point3_<uchar>* r1 = subimg1.ptr<Point3_<uchar> >(y);
const Point3_<uchar>* r2 = subimg2.ptr<Point3_<uchar> >(y);
for (int x = 0; x < roi.width; ++x)
{
if (overlap(y, x))
{
Isum1 += sqrt(static_cast<double>(sqr(r1[x].x) + sqr(r1[x].y) + sqr(r1[x].z)));
Isum2 += sqrt(static_cast<double>(sqr(r2[x].x) + sqr(r2[x].y) + sqr(r2[x].z)));
}
}
}
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I(i, j) = Isum1 / max(N(i, j), 1);
I(j, i) = Isum2 / max(N(i, j), 1);
}
}
}
double alpha = 0.01;
double beta = 100;
Mat_<double> A(num_images, num_images); A.setTo(0);
Mat_<double> b(num_images, 1); b.setTo(0);
for (int i = 0; i < num_images; ++i)
{
for (int j = 0; j < num_images; ++j)
{
b(i, 0) += beta * N(i, j);
A(i, i) += beta * N(i, j);
if (j == i) continue;
A(i, i) += 2 * alpha * I(i, j) * I(i, j) * N(i, j);
A(i, j) -= 2 * alpha * I(i, j) * I(j, i) * N(i, j);
}
}
solve(A, b, gains_, DECOMP_SVD);
}
void OverlapExposureCompensator::apply(int index, Point /*corner*/, Mat &image, const Mat &/*mask*/)
{
image *= gains_(index, 0);
}