James M Barnett

US Patent:

51401479, Aug 18, 1992

Filed:

Aug 14, 1990

Appl. No.:

7/567203

Inventors:

James S. Barnett - Dallas TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H01J 4014

US Classification:

2502081

Abstract:

A method and apparatus for recovering the resolution lost when the FPA FLIR receiver scans the image at a first predetermined frequency to avoid flicker on moving objects. The input image contains 960 lines of coarse resolution data and the output field requires 480 lines of fine resolution data. The processor delays the sampling of the even numbered channels so that these samples occur between the samples taken by the odd numbered channels. The output circuit combines the signals from the odd numbered and even numbered channels which appear on two separate input lines thereto into one interleaved output on an output line. Since the detector elements overlap by 50 percent, the resulting data has increased horizontal resolution at the expense of a slight vertical distortion. More specifically, the processor combines an even numbered line with the odd numbered line thereabove in the first field and with the odd numbered line therebelow in the second field to increase vertical resolution. The vertical distortion generates a fixed frequency component in the output video that can be reduced by a filter.