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//Chris Xiong 2022
//License: MPL-2.0
#include "subslice_signature.hpp"
#include <opencv2/core.hpp>
#include <opencv2/imgcodecs.hpp>
#include <opencv2/imgproc.hpp>
#include "imageutil.hpp"
subsliced_signature subsliced_signature::from_path(const std::filesystem::path &path,
size_t nhslices, size_t nvslices,
const signature_config &fcfg,
const signature_config &scfg)
{
cv::Mat img = image_util::imread_path(path, cv::IMREAD_UNCHANGED);
return subsliced_signature::from_cvmatrix(&img, nhslices, nvslices, fcfg, scfg);
}
subsliced_signature subsliced_signature::from_file(const char *fn,
size_t nhslices, size_t nvslices,
const signature_config &fcfg,
const signature_config &scfg)
{
cv::Mat img = cv::imread(fn, cv::IMREAD_UNCHANGED);
return subsliced_signature::from_cvmatrix(&img, nhslices, nvslices, fcfg, scfg);
}
subsliced_signature subsliced_signature::from_cvmatrix(cv::Mat *m,
size_t nhslices, size_t nvslices,
const signature_config &fcfg,
const signature_config &scfg)
{
subsliced_signature ret;
ret.full = signature::from_cvmatrix(m, fcfg);
cv::Mat *sm = m;
if (m->size().width / nhslices > 100 || m->size().height / nvslices > 100)
{
double sc = 100. * nhslices / m->size().width;
if (100. * nvslices / m->size().height < sc)
sc = 100. * nvslices / m->size().height;
sm = new cv::Mat();
cv::resize(*m, *sm, cv::Size(), sc, sc, cv::InterpolationFlags::INTER_LINEAR);
}
ret.nhslices = nhslices;
ret.nvslices = nvslices;
int ssw = sm->size().width / nhslices;
int ssh = sm->size().height / nvslices;
for (int i = 0; i < nhslices; ++i)
for (int j = 0; j < nvslices; ++j)
{
int l = i * ssw;
int r = (i == nhslices) ? sm->size().width : (i + 1) * ssw;
int t = j * ssh;
int b = (j == nvslices) ? sm->size().height : (j + 1) * ssh;
cv::Mat slice = (*sm)(cv::Range(t, b), cv::Range(l, r));
ret.subslices.push_back(std::move(signature::from_cvmatrix(&slice, scfg)));
}
if (sm != m)
delete sm;
return ret;
}
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