interface: add SIMPLE_PINHOLE model to COLMAP (#1226)

Author: ferreram

apps/InterfaceCOLMAP/InterfaceCOLMAP.cpp

@@ -303,10 +303,14 @@ struct Camera {
 		in >> ID >> model >> width >> height;
 		if (in.fail())
 			return false;
-		if (model != _T("PINHOLE"))
-			return false;
 		params.resize(4);
-		in >> params[0] >> params[1] >> params[2] >> params[3];
+		if (model == _T("PINHOLE")) {
+			in >> params[0] >> params[1] >> params[2] >> params[3];
+		} else if (model == _T("SIMPLE_PINHOLE")) {
+			in >> params[0] >> params[2] >> params[3];
+			params[1] = params[0];
+		} else
+			return false;
 		return !in.fail();
 	}
 
@@ -325,10 +329,18 @@ struct Camera {
 		model = mapCameraModel[ReadBinaryLittleEndian<int>(&stream)];
 		width = (uint32_t)ReadBinaryLittleEndian<uint64_t>(&stream);
 		height = (uint32_t)ReadBinaryLittleEndian<uint64_t>(&stream);
-		if (model != _T("PINHOLE"))
-			return false;
 		params.resize(4);
-		ReadBinaryLittleEndian<double>(&stream, &params);
+		if (model == _T("PINHOLE")) {
+			ReadBinaryLittleEndian<double>(&stream, &params);
+		} else if (model == _T("SIMPLE_PINHOLE")) {
+			std::vector<REAL> tmp_params(3);
+			ReadBinaryLittleEndian<double>(&stream, &tmp_params);
+			params[0] = tmp_params[0];
+			params[1] = tmp_params[0];
+			params[2] = tmp_params[1];
+			params[3] = tmp_params[2];
+		} else
+			return false;
 		return true;
 	}