Order of entries in BatchAnnotateImagesResponse

[opanchenko]

Given a list of image urls I want to annotate each image, i.e. extract text from each image. For that, I want to use Google Cloud Vision API client library in Java. Here is my pseudocode:

List<String> imageUrls = ...;
List<AnnotateImageRequest> requests = imageUrls.stream()
    .map(convertToRequest)
    .collect(Collectors::toList);
BatchAnnotateImagesResponse batchResponse = imageAnnotatorClient.batchAnnotateImages(requests);

Now from batchResponse I can get a list of AnnotateImageResponse. The questions are, does the number of AnnotateImageResponse correspond to the number of requests? Does the order of responses correspond to the order of requests? Can I safely assume that by doing so

for (int i = 0 ; i < imageUrls.size(); i++) {
    var url = imageUrls.get(i);
    var annotations = batchResponse.getResponses(i).getTextAnnotationsList();
}

I will get annotations for the right image on each iteration of the for loop? This is something that is not clear to me from the documentation.

[Nasif_GCP]

Hello,

Have you tried to use AsyncBatchAnnotateImages instead of batchAnnotateImages? As the response contains the context of each image mentioning the uri, eg:

 "context": {

        "uri": "gs://cloud-samples-data/vision/document_understanding/image1.png"

      }

The responses should be in the order of the requests. 

[opanchenko]

Hello Nasif,

AsyncBatchAnnotateImages doesn't fit to my usecase. If you say the responses should be in the order of the request, then I'll go for it with BatchAnnotateImagesResponse.