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United States Patent | 3,553,360 |
Land , et al. | January 5, 1971 |
In a television system, a subject is scanned to detect brightness ratios across visually significant boundary lines or edges between different areas of the subject. A signal is developed which represents the sequential multiplication of edge ratios of brightness detected on opposite sides of boundaries. This signal is employed to control the relative brightness of different areas of the image on the face of a television viewing screen. Applications to color television and other types of image reproduction systems are discussed.
Inventors: | Land; Edwin H. (Cambridge, MA), McCann; John J. (Cambridge, MA) |
Assignee: |
Polaroid Corporation
(Cambridge,
MA)
|
Appl. No.: | 04/699,496 |
Filed: | January 22, 1968 |
Current U.S. Class: | 348/469 ; 348/488; 348/E11.006; 348/E7.001 |
Current International Class: | H04N 7/00 (20060101); H04N 11/00 (20060101); H04N 11/02 (20060101); H04m 009/02 (); H04m 003/00 () |
Field of Search: | 178/5.2A,6BWR,6.8,7.2,(Inquired),7.2B&E,15ACE 328/145 333/14 |
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