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63 lines
1.4 KiB
Elixir
63 lines
1.4 KiB
Elixir
defmodule PhilomenaWeb.ImageReverse do
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alias Philomena.Analyzers
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alias Philomena.Processors
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alias Philomena.DuplicateReports
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alias Philomena.Repo
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import Ecto.Query
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def images(image_params) do
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image_params
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|> Map.get("image")
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|> analyze()
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|> intensities()
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|> case do
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:error ->
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[]
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{analysis, intensities} ->
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{width, height} = analysis.dimensions
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aspect = width / height
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dist = normalize_dist(image_params)
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DuplicateReports.duplicates_of(intensities, aspect, dist, dist)
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|> preload([:user, :intensity, [:sources, tags: :aliases]])
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|> Repo.all()
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end
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end
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defp analyze(%Plug.Upload{path: path}) do
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case Analyzers.analyze(path) do
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{:ok, analysis} -> {analysis, path}
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_ -> :error
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end
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end
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defp analyze(_upload), do: :error
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defp intensities(:error), do: :error
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defp intensities({analysis, path}) do
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{analysis, Processors.intensities(analysis, path)}
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end
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# The distance metric is taxicab distance, not Euclidean,
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# because this is more efficient to index.
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defp normalize_dist(%{"distance" => distance}) do
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distance
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|> parse_dist()
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|> max(0.01)
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|> min(1.0)
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end
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defp normalize_dist(_dist), do: 0.25
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defp parse_dist(dist) do
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case Decimal.parse(dist) do
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{value, _rest} ->
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Decimal.to_float(value)
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_ ->
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0.0
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end
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end
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end
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