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Google Cloud Functions Text Extraction from image using Vision API

I am following the tutorial to extract text from images at:

https://cloud.google.com/functions/docs/tutorials/ocr?authuser=1

But I do not wish to translate the text, I wish to detect and save the text.

The tutorial implements 3 functions:

gcloud beta functions deploy ocr-extract --trigger-bucket [YOUR_IMAGE_BUCKET_NAME] --entry-point processImage

gcloud beta functions deploy ocr-translate --trigger-topic [YOUR_TRANSLATE_TOPIC_NAME] --entry-point translateText

gcloud beta functions deploy ocr-save --trigger-topic [YOUR_RESULT_TOPIC_NAME] --entry-point saveResult


I just wish to detect text and save the text but I could not remove the translation portion of the code below:

/**
* Detects the text in an image using the Google Vision API.
*
* @param {string} bucketName Cloud Storage bucket name.
* @param {string} filename Cloud Storage file name.
* @returns {Promise}
*/
function detectText (bucketName, filename) {
let text;

console.log(`Looking for text in image ${filename}`);
return vision.textDetection({ source: { imageUri: `gs://${bucketName}/${filename}` } })
.then(([detections]) => {
const annotation = detections.textAnnotations[0];
text = annotation ? annotation.description : '';
console.log(`Extracted text from image (${text.length} chars)`);
return translate.detect(text);
})
.then(([detection]) => {
if (Array.isArray(detection)) {
detection = detection[0];
}
console.log(`Detected language "${detection.language}" for ${filename}`);

// Submit a message to the bus for each language we're going to translate to
const tasks = config.TO_LANG.map((lang) => {
let topicName = config.TRANSLATE_TOPIC;
if (detection.language === lang) {
topicName = config.RESULT_TOPIC;
}
const messageData = {
text: text,
filename: filename,
lang: lang,
from: detection.language
};

return publishResult(topicName, messageData);
});

return Promise.all(tasks);
});
}


After that, I just wish to save the detectec text to a file, as the code below shows:

/**
* Saves the data packet to a file in GCS. Triggered from a message on a Pub/Sub
* topic.
*
* @param {object} event The Cloud Functions event.
* @param {object} event.data The Cloud Pub/Sub Message object.
* @param {string} event.data.data The "data" property of the Cloud Pub/Sub
* Message. This property will be a base64-encoded string that you must decode.
*/
exports.saveResult = (event) => {
const pubsubMessage = event.data;
const jsonStr = Buffer.from(pubsubMessage.data, 'base64').toString();
const payload = JSON.parse(jsonStr);

return Promise.resolve()
.then(() => {
if (!payload.text) {
throw new Error('Text not provided. Make sure you have a "text" property in your request');
}
if (!payload.filename) {
throw new Error('Filename not provided. Make sure you have a "filename" property in your request');
}
if (!payload.lang) {
throw new Error('Language not provided. Make sure you have a "lang" property in your request');
}

console.log(`Received request to save file ${payload.filename}`);

const bucketName = config.RESULT_BUCKET;
const filename = renameImageForSave(payload.filename, payload.lang);
const file = storage.bucket(bucketName).file(filename);

console.log(`Saving result to ${filename} in bucket ${bucketName}`);

return file.save(payload.text);
})
.then(() => {
console.log(`File saved.`);
});
};


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