extract_above_mean()

std::vector< std::vector< double > > MayaFlux::Yantra::extract_above_mean	(	const std::vector< std::span< const double > > &	channels,
		double	mean_multiplier,
		uint32_t	window_size,
		uint32_t	hop_size
	)

Definition at line 144 of file ExtractionHelper.cpp.

{
    std::vector<std::vector<double>> result;
    result.reserve(channels.size());
    for (const auto& ch : channels) {
        if (ch.empty()) {
            result.emplace_back();
            continue;
        }
        const uint32_t w = std::min(window_size, static_cast<uint32_t>(ch.size()));
        const uint32_t h = std::max(1U, std::min(hop_size, w / 2));
        const auto means = D::mean(ch, D::num_windows(ch.size(), w, h), h, w);
        double gm = 0.0;
 
        for (double v : means)
            gm += v;
 
        if (!means.empty())
            gm /= static_cast<double>(means.size());
 
        const double thr = gm * mean_multiplier;
 
        std::vector<size_t> starts;
        for (size_t i = 0; i < means.size(); ++i) {
            if (means[i] > thr)
                starts.push_back(i * h);
        }
 
        result.push_back(D::slice_intervals(ch,
            D::merge_intervals(D::intervals_from_window_starts(starts, w, ch.size()))));
    }
    return result;
}

References MayaFlux::Kinesis::Discrete::intervals_from_window_starts(), MayaFlux::Kinesis::Discrete::mean(), MayaFlux::Kinesis::Discrete::merge_intervals(), MayaFlux::Kinesis::Discrete::num_windows(), and MayaFlux::Kinesis::Discrete::slice_intervals().

Referenced by MayaFlux::Yantra::FeatureExtractor< InputType, OutputType >::extract_implementation().

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