Unable to show the image using getPicture

var options = {

					destinationType: this.camera.DestinationType.FILE_URI,

encodingType: this.camera.EncodingType.JPEG,
mediaType: this.camera.MediaType.PICTURE,
quality:20,
targetWidth: 544,
targetHeight: 544,
allowEdit: false,
saveToPhotoAlbum: false
};

alert("options"+options.destinationType);

		this.camera.getPicture(options).then((imageData) => {
			// imageData is either a base64 encoded string or a file URI
    // If it's base64:

    
    
    alert("image data "+imageData);
			this.image = 'data:image/jpeg;base64,' + imageData;
    alert("this.image  << >> "+this.image);
     this.getCalories(this.image);
			}, (err) => {

console.log(err);
});

Ionic info

ordova CLI: 7.1.0
Ionic Framework Version: 2.0.1
Ionic CLI Version: 2.2.1
Ionic App Lib Version: 2.2.0
Ionic App Scripts Version: 1.3.12
ios-deploy version: Not installed
ios-sim version: Not installed
OS: Windows 10
Node Version: v6.11.4
Xcode version: Not installed