Age detection of photos in Ruby

Determining someone’s age automatically from a photo is much easier than you might think. Let’s do it in two steps.

First step, add this to your Gemfile:

gem 'cloudmersive-image-recognition-api-client', '~> 1.3.2'

Second step, call face_detect_age:

# load the gem
require 'cloudmersive-image-recognition-api-client'
# setup authorization
CloudmersiveImageRecognitionApiClient.configure do |config|
  # Configure API key authorization: Apikey
  config.api_key['Apikey'] = 'YOUR API KEY'
  # Uncomment the following line to set a prefix for the API key, e.g. 'Bearer' (defaults to nil)
  #config.api_key_prefix['Apikey'] = 'Bearer'
end
api_instance = CloudmersiveImageRecognitionApiClient::FaceApi.new
image_file = File.new("/path/to/file.txt") # File | Image file to perform the operation on.  Common file formats such as PNG, JPEG are supported.
begin
  #Detect the age of people in an image
  result = api_instance.face_detect_age(image_file)
  p result
rescue CloudmersiveImageRecognitionApiClient::ApiError => e
  puts "Exception when calling FaceApi->face_detect_age: #{e}"
end

And that’s all you have to do! Let’s look at an example. Here’s an image to try:

And our response from the API:

{
  "Successful": true,
  "PeopleWithAge": [
    {
      "FaceLocation": {
        "LeftX": 139,
        "TopY": 37,
        "RightX": 325,
        "BottomY": 273
      },
      "AgeClassificationConfidence": 0.9895910620689392,
      "AgeClass": "25-32"
    }
  ],
  "PeopleIdentified": 1
}

We are given the location of each face (in this case one, but it works with multiple), the approximate age range, and a confidence rating of this age range between 0 and 1. In this case it is almost guaranteed that the photo’s subject is between 25 and 32.