An ambiguous image is an image that has more than one interpretation. A classic example is Rubin's vase which can be seen as a vase or two faces. Human vision typically flips back and forth, largely unconstrollably, between the interpretations. In real situatiosn the ambiguity eiether resolves naturally or one moves ones head to geta. different view. The latter is emulated in actve visions where the camera moves.
Used on Chap. 12: page 243; Chap. 15: page 361; Chap. 22: page 540
Also known as in computer vision
Rubin's vase. Source: NevitNevit Dilmen, CC BY-SA 3.0 via Wikimedia Commons