Move stuff around to accommodate new family members.

1 files changed, 62 insertions, 0 deletions

diff --git a/xsig/src/subslice_signature.cpp b/xsig/src/subslice_signature.cpp
new file mode 100644
index 0000000..75b1a43
--- /dev/null
+++ b/xsig/src/subslice_signature.cpp
@@ -0,0 +1,62 @@
+//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;
+}