For each image within a Vision API request, you can specify one or more features to detect, passing those within the features array for each image. This set of types is listed below:

Feature TypeDescription
LABEL_DETECTION Execute Image Content Analysis on the entire image and return
TEXT_DETECTION Perform Optical Character Recognition (OCR) on text within the image (character limit applies)
DOCUMENT_TEXT_DETECTION Perform Optical Character Recognition (OCR) on dense text image (premium feature not subject to character limit)
FACE_DETECTION Detect faces within the image
LANDMARK_DETECTION Detect geographic landmarks within the image
LOGO_DETECTION Detect company logos within the image
SAFE_SEARCH_DETECTION Determine image safe search properties on the image
IMAGE_PROPERTIES Compute a set of properties about the image (such as the image's dominant colors)

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Google Cloud Vision API Documentation