You can achieve that by using the Image URL Formatter module.
This module adds an url formatter for image field. Then you can output the image url directly.
- After install this module,then you add an image field,then you can goto this bundle's manage display page,here at format column,you can choose "Image URL" instead of "Image".
- When you add an image field in your views,then you config the Formatter for this field, here you can choose "Image URL" instead of "Image".
Now you can output the URL of the image instead of the image itself.