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An approachable image processing library primarily based upon Vix and libvips that is NIF-based, fast, multi-threaded, pipelined and has a low memory footprint.
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lib/image/options/local_contrast.ex
defmodule Image.Options.LocalContrast do
@moduledoc """
Options and option validation for `Image.local_contrast/2`.
"""
@typedoc """
Options applicable to `Image.local_contrast/2`.
"""
@type local_contrast_option ::
{:window_size, pos_integer()}
| {:max_slope, non_neg_integer()}
@typedoc """
Options list or map for `Image.local_contrast/2`.
"""
@type local_contrast_options :: [local_contrast_option()] | map()
# Default window size in pixels over which the
# local contrast is evaluated
@default_window_size 3
# Integral level of brightening, between 0 and
# 100, where 0 (the default) disables contrast limiting.
@default_max_slope 0
@doc """
Validate the options for `Image.local_contrast/2`.
"""
def validate_options(options) when is_list(options) do
options = Keyword.merge(default_options(), options)
case Enum.reduce_while(options, options, &validate_option(&1, &2)) do
{:error, value} ->
{:error, value}
options ->
{:ok, Map.new(options)}
end
end
defp validate_option({:window_size, window_size}, options)
when is_integer(window_size) and window_size > 0 do
{:cont, options}
end
defp validate_option({:max_slope, max_slope}, options)
when is_integer(max_slope) and max_slope >= 0 do
{:cont, options}
end
defp validate_option(option, _options) do
{:halt, {:error, invalid_option(option)}}
end
defp invalid_option(option) do
"Invalid option or option value: #{inspect(option)}"
end
defp default_options do
[
window_size: @default_window_size,
max_slope: @default_max_slope
]
end
end