size_t determine_upsample_ratio (const Image::Info& info, const Tractography::Properties& properties, const float ratio)
{
if (info.ndim() < 3)
throw Exception ("Cannot perform streamline mapping on image with less than three dimensions");
Properties::const_iterator i = properties.find ("output_step_size");
if (i == properties.end()) {
i = properties.find ("step_size");
if (i == properties.end())
throw Exception ("Cannot perform streamline mapping: no step size information in track file header");
}
const float step_size = to<float> (i->second);
return determine_upsample_ratio (info, step_size, ratio);
}
size_t determine_upsample_ratio (const Header& header, const Tractography::Properties& properties, const float ratio)
{
if (header.ndim() < 3)
throw Exception ("Cannot perform streamline mapping on image with less than three dimensions");
return determine_upsample_ratio (header, get_step_size (properties), ratio);
}
size_t determine_upsample_ratio (const Image::Info& info, const std::string& tck_path, const float ratio)
{
Tractography::Properties properties;
Tractography::Reader<> reader (tck_path, properties);
return determine_upsample_ratio (info, properties, ratio);
}
size_t determine_upsample_ratio (const Header& header, const std::string& tck_path, const float ratio)
{
Properties properties;
Reader<> reader (tck_path, properties);
return determine_upsample_ratio (header, properties, ratio);
}
