Abstract

Minnaert (1939) remarks on the appearance of undulating moors and other sources of step brightness changes. He correctly notes that adjacent to the dark-bright step change at the top of the nearer moor, an optical illusion occurs. The nearer moor, being darker either by virtue of less intervening airtight than the more distant one or by the circumstances of the moors’ illumination, appears to have a dark band at its top bordering the more distant moor. Similarly, the more distant moor seems to have a bright band adjacent to the top of the nearer (darker) moor.

© 1990 Optical Society of America