Gets the owner DocumentReader.
An instance of the DocumentImageManager isn't created directly, instead access the instance automatically created inside a DocumentReader using the ImageManager property.
For an example, refer to DocumentImageManager.
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2