Add Cloud Vision face detection sample.

README.md

@@ -14,6 +14,7 @@ This repository holds Node.js samples used throughout [cloud.google.com]().
 * [Google Cloud Logging](#google-cloud-logging)
 * [Google Cloud Pub/Sub](#google-cloud-pubsub)
 * [Google Cloud Storage](#google-cloud-storage)
+* [Google Cloud Vision](#google-cloud-vision)
 * [Google Prediction API](#google-prediction-api)
 * [Other Example Apps](#other-example-apps)
 * [More Information](#more-information)
@@ -106,6 +107,10 @@ __Other Examples__
 
 - Auth sample - [Source code][storage_1] | [Documentation][storage_2]
 
+## Google Cloud Vision
+
+- Face detection - [Source code][vision_1] | [Documentation][vision_2]
+
 ## Google Prediction API
 
 - Hosted Models sample - [Source code][predictionapi_1] | [Documentation][predictionapi_2]
@@ -307,6 +312,9 @@ See [LICENSE](https://github.com/GoogleCloudPlatform/nodejs-docs-samples/blob/ma
 [storage_1]: https://github.com/GoogleCloudPlatform/nodejs-docs-samples/blob/master/storage/authSample.js
 [storage_2]: https://cloud.google.com/storage/docs/authentication#acd-examples
 
+[vision_1]: https://github.com/GoogleCloudPlatform/nodejs-docs-samples/blob/master/vision/faceDetection.js
+[vision_2]: https://cloud.google.com/vision/docs/face-tutorial
+
 [predictionapi_1]: https://github.com/GoogleCloudPlatform/nodejs-docs-samples/blob/master/prediction/hostedmodels.js
 [predictionapi_2]: https://cloud.google.com/prediction/docs/developer-guide#predictionfromappengine
 

package.json

@@ -46,7 +46,7 @@
   },
   "ava": {
     "files": [
-      "test/appengine/**/*.test.js"
+      "test/**/*.test.js"
     ]
   },
   "devDependencies": {

test/vision/faceDetection.test.js

@@ -0,0 +1,35 @@
+// 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 faceDetectionExample = require('../../vision/faceDetection');
+var inputFile = path.resolve(path.join('../../vision', 'face.png'));
+var outputFile = path.resolve(path.join('../../vision', 'out.png'));
+
+test.cb('should detect faces', function (t) {
+  faceDetectionExample.main(
+    inputFile,
+    outputFile,
+    function (err, faces) {
+      t.ifError(err);
+      t.is(faces.length, 1);
+      var image = fs.readFileSync(outputFile);
+      t.ok(image);
+      t.end();
+    }
+  );
+});

vision/.gitignore

@@ -0,0 +1 @@
+out.*

vision/README.md

@@ -0,0 +1,30 @@
+## Cloud Vision API samples
+
+These samples require two environment variables to be set:
+
+- `GOOGLE_APPLICATION_CREDENTIALS` - Path to a service account file. You can
+download one from your Google project's "credentials" page.
+- `GCLOUD_PROJECT` - ID of your Google project.
+
+See [gcloud-node authentication][auth] for more details.
+
+[auth]: https://googlecloudplatform.github.io/gcloud-node/#/docs/guides/authentication
+
+## Run a sample
+
+Install dependencies first:
+
+    npm install
+
+### Face detection sample
+
+This sample uses [node-canvas](https://github.com/Automattic/node-canvas) to
+draw an output image. node-canvas depends on Cairo, which may require separate
+installation. See the node-canvas [installation section][canvas-install] for
+details.
+
+[canvas-install]: https://github.com/Automattic/node-canvas#installation
+
+Execute the sample:
+
+    node faceDetection "/path/to/image.jpg"

vision/faceDetection.js

@@ -0,0 +1,119 @@
+// 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 auth]
+// 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
+var gcloud = require('gcloud')({
+  projectId: projectId
+});
+
+// Get a reference to the vision component
+var vision = gcloud.vision();
+// [END auth]
+
+var fs = require('fs');
+var Canvas = require('canvas');
+var Image = Canvas.Image;
+
+/**
+ * Uses the Vision API to detect faces in the given file.
+ */
+function detectFaces(inputFile, callback) {
+  // Make a call to the Vision API to detect the faces
+  vision.detectFaces(inputFile, function (err, faces) {
+    if (err) {
+      return callback(err);
+    }
+    var numFaces = faces.length;
+    console.log('Found ' + numFaces + (numFaces === 1 ? ' face' : ' faces'));
+    callback(null, faces);
+  });
+}
+
+/**
+ * Draws a polygon around the faces, then saves to outputFile.
+ */
+function highlightFaces(inputFile, faces, outputFile, callback) {
+  fs.readFile(inputFile, function (err, image) {
+    if (err) {
+      return callback(err);
+    }
+
+    // Open the original image into a canvas
+    var img = new Image();
+    img.src = image;
+    var canvas = new Canvas(img.width, img.height);
+    var context = canvas.getContext('2d');
+    context.drawImage(img, 0, 0, img.width, img.height);
+
+    // Now draw boxes around all the faces
+    context.strokeStyle = 'rgba(0,255,0,0.8)';
+    context.lineWidth = '5';
+
+    faces.forEach(function (face) {
+      context.beginPath();
+      face.bounds.face.forEach(function (bounds) {
+        context.lineTo(bounds.x, bounds.y);
+      });
+      context.lineTo(face.bounds.face[0].x, face.bounds.face[0].y);
+      context.stroke();
+    });
+
+    // Write the result to a file
+    console.log('Writing to file ' + outputFile);
+    var writeStream = fs.createWriteStream(outputFile);
+    var pngStream = canvas.pngStream();
+
+    pngStream.on('data', function (chunk) {
+      writeStream.write(chunk);
+    });
+    pngStream.on('error', console.log);
+    pngStream.on('end', callback);
+  });
+}
+
+// Run the example
+function main(inputFile, outputFile, callback) {
+  outputFile = outputFile || 'out.png';
+  detectFaces(inputFile, function (err, faces) {
+    if (err) {
+      return callback(err);
+    }
+
+    console.log('Highlighting...');
+    highlightFaces(inputFile, faces, outputFile, function (err) {
+      if (err) {
+        return callback(err);
+      }
+      console.log('Finished!');
+      callback(null, faces);
+    });
+  });
+}
+
+exports.main = main;
+
+if (module === require.main) {
+  if (process.argv.length < 3) {
+    console.log('Usage: node faceDetection <inputFile> [outputFile]');
+    process.exit(1);
+  }
+  exports.main(process.argv[2], process.argv[3], console.log);
+}

vision/package.json

@@ -0,0 +1,17 @@
+{
+  "name": "cloud-vision-samples",
+  "description": "Node.js samples for Google Cloud Vision.",
+  "version": "0.0.1",
+  "private": true,
+  "license": "Apache Version 2.0",
+  "engines": {
+    "node": ">=0.10.x"
+  },
+  "scripts": {
+    "faceDetection": "node faceDetection.js"
+  },
+  "dependencies": {
+    "gcloud": "^0.32.0",
+    "canvas": "^1.3.15"
+  }
+}