Add Cloud Vision label detection sample.

Author: jmdobry

test/vision/faceDetection.test.js

@@ -46,7 +46,7 @@ function MockCanvas () {
 MockCanvas.Image = function () {};
 
 var faceDetectionExample = require('../../vision/faceDetection');
-var inputFile = path.resolve(path.join('../../vision', 'face.png'));
+var inputFile = path.resolve(path.join('../../vision/resources', 'face.png'));
 var outputFile = path.resolve(path.join('../../vision', 'out.png'));
 
 test.cb('should detect faces', function (t) {

test/vision/labelDetection.test.js

@@ -0,0 +1,32 @@
+// Copyright 2016, Google, Inc.
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+'use strict';
+
+var test = require('ava');
+var fs = require('fs');
+var path = require('path');
+
+var labelDetectionSample = require('../../vision/labelDetection');
+var inputFile = path.resolve(path.join('../../vision/resources', 'cat.jpg'));
+
+test.cb('should detect labels', function (t) {
+  labelDetectionSample.main(
+    inputFile,
+    function (err, labels) {
+      t.ifError(err);
+      t.ok(labels.length > 0);
+      t.end();
+    }
+  );
+});

vision/README.md

@@ -28,3 +28,9 @@ details.
 Execute the sample:
 
     node faceDetection "/path/to/image.jpg"
+
+### Label detection sample
+
+Execute the sample:
+
+    node labelDetection "/path/to/image.jpg"

vision/labelDetection.js

@@ -0,0 +1,79 @@
+// Copyright 2016, Google, Inc.
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+'use strict';
+
+// [START app]
+// [START import_libraries]
+var gcloud = require('gcloud');
+// [END import_libraries]
+
+// [START authenticate]
+// You must set the GOOGLE_APPLICATION_CREDENTIALS and GCLOUD_PROJECT
+// environment variables to run this sample. See:
+// https://github.com/GoogleCloudPlatform/gcloud-node/blob/master/docs/authentication.md
+var projectId = process.env.GCLOUD_PROJECT;
+
+// Initialize gcloud
+gcloud = gcloud({
+  projectId: projectId
+});
+
+// Get a reference to the vision component
+var vision = gcloud.vision();
+// [END authenticate]
+
+/**
+ * Uses the Vision API to detect labels in the given file.
+ */
+// [START construct_request]
+function detectLabels(inputFile, callback) {
+  // Make a call to the Vision API to detect the labels
+  vision.detectLabels(inputFile, { verbose: true }, function (err, labels) {
+    if (err) {
+      return callback(err);
+    }
+    var numLabels = labels.length;
+    console.log('Found ' + numLabels + (numLabels === 1 ? ' label' : ' labels'));
+    callback(null, labels);
+  });
+}
+// [END construct_request]
+
+// Run the example
+function main(inputFile, callback) {
+  detectLabels(inputFile, function (err, labels) {
+    if (err) {
+      return callback(err);
+    }
+
+    // [START construct_request]
+    console.log('result:', JSON.stringify(labels, null, 2));
+    // [END construct_request]
+    callback(null, labels);
+  });
+}
+
+// [START run_application]
+if (module === require.main) {
+  if (process.argv.length < 3) {
+    console.log('Usage: node labelDetection <inputFile>');
+    process.exit(1);
+  }
+  var inputFile = process.argv[2];
+  main(inputFile, console.log);
+}
+// [END run_application]
+// [END app]
+
+exports.main = main;

vision/package.json

@@ -8,7 +8,8 @@
     "node": ">=0.10.x"
   },
   "scripts": {
-    "faceDetection": "node faceDetection.js"
+    "faceDetection": "node faceDetection.js",
+    "labelDetection": "node labelDetection.js"
   },
   "dependencies": {
     "gcloud": "^0.32.0",