Using Google cloud vision easily

gcv_api.rb

require 'google/apis/vision_v1'

class GcvApi
  def initialize api_key, option={}
    default = {
      retry: 5,
      max_results: 2048,
      language_hints: 'ja'
    }
    @option = default.merge option
    @vision = Google::Apis::VisionV1::VisionService.new
    @vision.key = api_key
    Google::Apis::RequestOptions.default.retries = @option[:retry]
  end

  def analyzed_data image_path
    request = Google::Apis::VisionV1::BatchAnnotateImagesRequest.new(
      requests: [{
        image: {content: File.read(image_path)},
        features: [{
          type: 'TEXT_DETECTION',
          maxResults: @option[:max_results]
        }],
        imageContext: {languageHints: @option[:language_hints]}
      }]
    )

    @vision.annotate_image(request)
  end

  def json image_path
    self.analyzed_data(image_path).to_json
  end

  def text image_path
    result = self.analyzed_data(image_path)
    result.responses.map do |r|
      r.text_annotations.first.description
    end
  end
end