Quantize

20.9.0

Quantizes an input range.

template <typename TInput, typename TCompare = etl::less<TInput> >

class quantize : public etl::unary_function<TInput, TInput>

TInput The input data type.

TCompare The functor type used to compare values to the threshold. The default is etl::less

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quantize(const TInput* p_thresholds,

const TInput* p_quantizations,

size_t n_quantizations,

TCompare compare = TCompare())

p_thresholds A pointer to the list of threshold values.

p_quantizations A pointer to the list of quantization values. One more than the number of thresholds.

n_quantizations The number of quantization values.

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TInput operator()(TInput value) const

Threshold a value.

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Example

constexpr size_t Size = 20U;

constexpr size_t NThresholds = 4U;

std::array<int, NThresholds> thresholds =

{

14, 18, 22, 25

};

std::array<int, NThresholds + 1> quantizations =

{

1, 2, 3, 4, 5

};

std::array<int, Size> input =

{

10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29

};

std::array<int, Size> output;

etl::quantize<int> quantize(thresholds.data(), quantizations.data(), quantizations.size());

std::transform(input.begin(), input.end(), output.begin(), quantize);

// output = 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 5, 5, 5, 5, 5

quantize.h