Coding Images in the Frequency Domain: Filter Design and Energy Processing Characteristics of the Human Visual System

To this stage a large amount of information has accumulated on one-dimensional broad-band frequency channel characteristics of the visual system. Only recently have attempts been made to define additional two-dimensional narrow-band energy processing units, particularly in central vision. Questions concerning the number, tuning widths, and phase sensitivity of such two-dimensional units are reviewed. Results with grating and two-dimensional images are discussed, particularly within the context of energy processing and information reduction strategies for the human observer. Finally, a consequent principle of univariance is defined and shown to hold with such filter units. © 1983 IEE