In the Scene View,
click View > Image Plane > Import Image.
An image plane is automatically created and connected to the camera
and you are prompted to choose the image.
In
the Environment section of the camera’s Attribute Editor (View
> Camera Attribute Editor), click the Create button
to the right of the Image Plane attribute.
Maya creates an image
plane and connects it to the camera.
TipMultiple image planes
can be created per camera for interesting backgrounds, ordered by
depth. right on the arrow key of the image plane attribute in the
camera to display a list of the image planes per camera.
Make
sure that the Type attribute for the image
plane is set to Image File (the default setting).
Click the folder button for the Image
Name attribute. The file browser appears.
Select the image file you want to use
as a background, and click Open. Maya
connects the image file to the image plane.