takePicture(){
    Camera.getPicture({
        destinationType: Camera.DestinationType.DATA_URL,
        targetWidth: 1000,
        targetHeight: 1000
    }).then((imageData) => {
      // imageData is a base64 encoded string
        this.base64Image = "data:image/jpeg;base64," + imageData;
        alert('ok')
    }, (err) => {
        console.log(err);
        alert(err)
    });
  }