Cloud Vision API with Golang

Prerequisites

Enable Cloud Vision API

You need to turn it on manually to be available. Let’s see and enable on your developer console.

Setting Up a Service Account

Set up a service account on credentials page and get a service account credentials json file.

Export credentials environment variable

Export export a service account json file into GOOGLE_APPLICATION_CREDENTIALS env variable:

$ export GOOGLE_APPLICATION_CREDENTIALS=/path/to/service_account.json

Dependencies

To run this sample, you need to install these packages:

golang.org/x/net/context
golang.org/x/oauth2/google
google.golang.org/api/vision/...

To install all of them at once, type:

go get github.com/hermanschaaf/go-cloud-vision-api/...

Installation

Type the below command to install if you use this application on your device.

go get github.com/hermanschaaf/go-cloud-vision-api

Make sure that go-cloud-vision-api was installed correctly:

go-cloud-vision-api -h

Usage

go run main.go lenna.jpg

or if you already installed as a command.

go-cloud-vision-api lenna.jpg

Example

input

output

more detail

[
  {
    "faceAnnotations": [
      {
        "angerLikelihood": "VERY_UNLIKELY",
        "blurredLikelihood": "VERY_UNLIKELY",
        "boundingPoly": {
          "vertices": [
            {
              "x": 143,
              "y": 43
            },
            {
              "x": 245,
              "y": 43
            },
            {
              "x": 245,
              "y": 163
            },
            {
              "x": 143,
              "y": 163
            }
          ]
        },
        "detectionConfidence": 0.99805844,
        "fdBoundingPoly": {
          "vertices": [
            {
              "x": 172,
              "y": 82
            },
            {
              "x": 241,
              "y": 82
            },
            {
              "x": 241,
              "y": 151
            },
            {
              "x": 172,
              "y": 151
            }
          ]
        },
        "headwearLikelihood": "UNLIKELY",
        "joyLikelihood": "VERY_UNLIKELY",
        "landmarkingConfidence": 0.5350582,
        "landmarks": [
          {
            "position": {
              "x": 197.90556,
              "y": 102.932,
              "z": 0.00083794753
            },
            "type": "LEFT_EYE"
          },
          {
            "position": {
              "x": 223.43489,
              "y": 102.72927,
              "z": 17.352478
            },
            "type": "RIGHT_EYE"
          },
          {
            "position": {
              "x": 189.50327,
              "y": 96.40799,
              "z": -4.1362653
            },
            "type": "LEFT_OF_LEFT_EYEBROW"
          },
          ...

License

The MIT License (MIT)

Author

Shintaro Kaneko kaneshin0120@gmail.com

hermanschaaf / go-cloud-vision-api