captured image

A bitmap image captured from the display of the AUT for storage or testing.
Note:

From the standpoint of picture handling, any image – baseline, training, or test – that is captured from the AUT may be considered a captured image. Generally, however, the term is reserved for an image captured from the AUT during testing for the purpose of comparison against a baseline image.

The term image under test is less ambiguous, referring specifically to an image captured from the AUT for the purpose of comparison against a baseline.