Detectar rótulos em uma imagem usando a API Cloud Vision

Neste guia de início rápido, você aprende a:

  • Criar um bucket do Cloud Storage.
  • Fazer upload de uma imagem no Cloud Storage e tornar o arquivo acessível publicamente.
  • Fazer uma solicitação para a API Vision com a imagem

Essas etapas levam cerca de cinco minutos. É possível armazenar até 5 GB de dados no Cloud Storage sem custo financeiro e fazer até 1.000 solicitações de recursos por mês para a API Vision sem custo financeiro.

Antes de começar

Se você ainda não fez isso, use as instruções a seguir para configurar o projeto e criar um bucket do Cloud Storage.

Criar o projeto

  1. Sign in to your Google Cloud account. If you're new to Google Cloud, create an account to evaluate how our products perform in real-world scenarios. New customers also get $300 in free credits to run, test, and deploy workloads.

  2. In the Google Cloud console, on the project selector page, select or create a Google Cloud project.

    Roles required to select or create a project

    • Select a project: Selecting a project doesn't require a specific IAM role—you can select any project that you've been granted a role on.
    • Create a project: To create a project, you need the Project Creator role (roles/resourcemanager.projectCreator), which contains the resourcemanager.projects.create permission. Learn how to grant roles.

    Go to project selector

  3. Verify that billing is enabled for your Google Cloud project.

  4. Enable the Cloud Vision API.

    Roles required to enable APIs

    To enable APIs, you need the Service Usage Admin IAM role (roles/serviceusage.serviceUsageAdmin), which contains the serviceusage.services.enable permission. Learn how to grant roles.

    Enable the API

  5. In the Google Cloud console, on the project selector page, select or create a Google Cloud project.

    Roles required to select or create a project

    • Select a project: Selecting a project doesn't require a specific IAM role—you can select any project that you've been granted a role on.
    • Create a project: To create a project, you need the Project Creator role (roles/resourcemanager.projectCreator), which contains the resourcemanager.projects.create permission. Learn how to grant roles.

    Go to project selector

  6. Verify that billing is enabled for your Google Cloud project.

  7. Enable the Cloud Vision API.

    Roles required to enable APIs

    To enable APIs, you need the Service Usage Admin IAM role (roles/serviceusage.serviceUsageAdmin), which contains the serviceusage.services.enable permission. Learn how to grant roles.

    Enable the API

    8.

    Funções exigidas

    1. Make sure that you have the following role or roles on the project: Storage Admin (roles/storage.admin)

      Check for the roles

      1. In the Google Cloud console, go to the IAM page.

        Go to IAM
      2. Select the project.

      3. In the Principal column, find all rows that identify you or a group that you're included in. To learn which groups you're included in, contact your administrator.

      4. For all rows that specify or include you, check the Role column to see whether the list of roles includes the required roles.

      Grant the roles

      1. In the Google Cloud console, go to the IAM page.

        Acessar o IAM
      2. Selecione o projeto.
      3. Clique em Conceder acesso.

      4. No campo Novos principais, digite seu identificador de usuário. Normalmente, é o endereço de e-mail de uma Conta do Google.

      5. Na lista Selecionar papel, escolha um.
      6. Para conceder outros papéis, adicione-os clicando em Adicionar outro papel.
      7. Clique em Salvar.

      Criar um bucket do Cloud Storage

      1. In the Google Cloud console, go to the Cloud Storage Buckets page.

        Go to Buckets

      2. Click Create.
      3. On the Create a bucket page, enter your bucket information. To go to the next step, click Continue.
        1. For Name your bucket, enter a unique bucket name. Don't include sensitive information in the bucket name, because the bucket namespace is global and publicly visible.
        2. In the Choose where to store your data section, do the following:
          1. Select a Location type.
          2. Choose a location where your bucket's data is permanently stored from the Location type drop-down menu.
          3. To set up cross-bucket replication, select Add cross-bucket replication via Storage Transfer Service and follow these steps:

            Set up cross-bucket replication

            1. In the Bucket menu, select a bucket.

            2. In the Replication settings section, click Configure to configure settings for the replication job.

              The Configure cross-bucket replication pane appears.

              • To filter objects to replicate by object name prefix, enter a prefix that you want to include or exclude objects from, then click Add a prefix.
              • To set a storage class for the replicated objects, select a storage class from the Storage class menu. If you skip this step, the replicated objects will use the destination bucket's storage class by default.
              • Click Done.
        3. In the Choose how to store your data section, do the following:
          1. In the Set a default class section, select the following: Standard.
          2. To enable hierarchical namespace, in the Optimize storage for data-intensive workloads section, select Enable hierarchical namespace on this bucket.
        4. In the Choose how to control access to objects section, select whether or not your bucket enforces public access prevention, and select an access control method for your bucket's objects.
        5. In the Choose how to protect object data section, do the following:
          • Select any of the options under Data protection that you want to set for your bucket.
            • To enable soft delete, click the Soft delete policy (For data recovery) checkbox, and specify the number of days you want to retain objects after deletion.
            • To set Object Versioning, click the Object versioning (For version control) checkbox, and specify the maximum number of versions per object and the number of days after which the noncurrent versions expire.
            • To enable the retention policy on objects and buckets, click the Retention (For compliance) checkbox, and then do the following:
              • To enable Object Retention Lock, click the Enable object retention checkbox.
              • To enable Bucket Lock, click the Set bucket retention policy checkbox, and choose a unit of time and a length of time for your retention period.
          • To choose how your object data will be encrypted, expand the Data encryption section (), and select a Data encryption method.
      4. Click Create.

      Fazer uma solicitação ao Cloud Vision

      1. Salve uma versão local do arquivo de imagem de exemplo a seguir (demo-img.jpg).

        Duas mulheres andando de bicicleta em Jacarta.
        Crédito da imagem: Rohiim Ariful em Unsplash.

      2. No console do Google Cloud , acesse a página Buckets do Cloud Storage.

        Acessar Buckets

      3. Selecione o bucket que você criou na seção anterior.

      4. Clique em Fazer upload de arquivos e selecione a versão local do arquivo demo-img.jpg para fazer upload para o bucket do Cloud Storage.

      5. Depois que o arquivo for enviado e aparecer no bucket do Cloud Storage, compartilhe a imagem publicamente.

      6. Na seção Testar este método, preencha o modelo interativo do API Explorer substituindo cloud-samples-data/vision no campo image.source.imageUri pelo nome do bucket do Cloud Storage no qual foi feito upload do arquivo demo-img.jpg. O corpo da solicitação deve ficar assim: 

        {
  "requests": [
    {
      "features": [
        {
          "type": "LABEL_DETECTION"
        }
      ],
      "image": {
        "source": {
          "imageUri": "gs://cloud-samples-data/vision/demo-img.jpg"
        }
      }
    }
  ]
}

      7. Clique em Executar para enviar a solicitação ao serviço. A resposta JSON aparece após o corpo da solicitação.

      Parabéns! Você fez sua primeira solicitação images.annotate ao Cloud Vision.

      Limpar

      Para evitar cobranças desnecessárias do Google Cloud , use o console do Google Cloud para excluir o bucket do Cloud Storage (e seu projeto) se você não precisar deles.

      A seguir