David E Wolff

US Patent:

6354737, Mar 12, 2002

Filed:

Nov 12, 1999

Appl. No.:

09/438606

Inventors:

Mark J. Hufe - Newark DE
David Paul Wolff - Newark DE
Chuande Liu - Hockessin DE

Assignee:

Direct Radiography Corp. - Newark DE

International Classification:

H05G 128

US Classification:

378205, 378163, 378164, 378165, 23546201

Abstract:

An orientation marker for a digital radiogram formed by a plurality of pixels arrayed along a plurality of rows and columns. The pixels have densities which represent the radiogram optical density at each pixel point, and the densities are represented by digital values. The marker is made by a number of marker pixels arrayed along at least one row and one column of the radiogram. Each of the pixels forming the marker, have a marker pixel digital value which has been selected to form an asymmetrical marker pixel pattern on the radiogram, replacing the original radiogram pixel values.