image_detectface: Uses default algorithm to detect a face in the image and provide its coordinates.
image_detecttext: Uses default algorithm to detect text in the image.
image_classify(images, api_key, keep_data = "true", callback = NULL, type = "image/jpeg", version = "2016-05-20", accept_language = "en", batch_size = 1)
image_detectface(images, api_key, keep_data = "true", callback = NULL, type = "image/jpeg", version = "2016-05-20", batch_size = 1)
image_detecttext(images, api_key, keep_data = "true", callback = NULL, type = "image/jpeg", version = "2016-05-20", batch_size = 1)