R Package for Image Recognition, Object Detection, and OCR using the Google Cloud Vision API.
Cloud Vision API enables developers to understand the content of an image by encapsulating powerful machine learning models in an easy-to-use REST API. It quickly classifies images into thousands of categories (such as, “sailboat”), detects individual objects and faces within images, and reads printed words contained within images. You can build metadata on your image catalog, moderate offensive content, or enable new marketing scenarios through image sentiment analysis.
Read more on the capabilities of the Google Cloud Vision API.
This package allows you to call the following functionalities: label, text, landmark, face and logo detection.
WARNING: the project is in active development and is not guaranteed to be stable in terms of function names, signatures, etc. Contributions through issues, pull requests are more than welcome.
v0.1.0 is already available on CRAN, you can install it with:
If you need the latest version, just install the package directly from Github:
You should use a
.json file pertaining to a service account for authentication
whose path you should specify in an environment variable
Sys.setenv("GCV_AUTH_FILE" = "/fullpath/to/auth.json")
This can alternatively be set on the command line or via an
.Renviron file (see here for instructions).
If this is set, upon loading the package authentication happens automatically.
# GCV_AUTH_FILE set so auto-authentication happens library(googleCloudVisionR) #> Successfully authenticated via /fullpath/to/auth.json
Let us retrieve annotations for this image:
Label detection (default), with maximum 7 results returned per image:
imagePath <- system.file( "extdata", "golden_retriever_puppies.jpg", package = "googleCloudVisionR" ) gcv_get_image_annotations( imagePaths = imagePath, feature = "LABEL_DETECTION", maxNumResults = 7 ) #> image_path mid description score topicality #> 1: golden_retriever_puppies.jpg /m/0bt9lr Dog 0.9953705 0.9953705 #> 2: golden_retriever_puppies.jpg /m/04rky Mammal 0.9890478 0.9890478 #> 3: golden_retriever_puppies.jpg /m/09686 Vertebrate 0.9851104 0.9851104 #> 4: golden_retriever_puppies.jpg /m/01z5f Canidae 0.9813780 0.9813780 #> 5: golden_retriever_puppies.jpg /m/0kpmf Dog breed 0.9683250 0.9683250 #> 6: golden_retriever_puppies.jpg /m/0d7s3w Puppy 0.9400384 0.9400384 #> 7: golden_retriever_puppies.jpg /m/01t032 Golden retriever 0.8966703 0.8966703
Annotation can also happen in batches, allowing for continuing previously stopped (or interrupted) annotations as well.
gcv_get_image_annotations( imagePaths = c(image_path_1, image_path_2,..., image_path_128), batchSize = 64L, savePath = "path/to/annotation_file.csv" )
Here we take 128 images and annotate them in batces of size 64.
If, for example, we have previously annotated the first batch of images
whose results have been stored in
savePath, then only the leftovers
are annotated. A dataframe with all annotations is returned and the
new set of annotations gets appended to
Images can not only be read from local disk, but you can use URLs or Google Cloud Storage URIs as well:
gcv_get_image_annotations(c( "https://bit.ly/2IhUzdE", "gs://vision-api-handwriting-ocr-bucket/handwriting_image.png" ), maxNumResults = 2) #> image_path mid description score topicality #> 1: https://bit.ly/2IhUzdE /m/0bt9lr Dog 0.9953705 0.9953705 #> 2: https://bit.ly/2IhUzdE /m/04rky Mammal 0.9890478 0.9890478 #> 3: gs://vision-api-handwriting-ocr-bucket/handwriting_image.png /m/07s6nbt Text 0.9540842 0.9540842 #> 4: gs://vision-api-handwriting-ocr-bucket/handwriting_image.png /m/03scnj Line 0.9027576 0.9027576
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