Stephen S Demko

US Patent:

6697532, Feb 24, 2004

Filed:

Oct 29, 1999

Appl. No.:

09/430204

Inventors:

Stephen George Demko - Atlanta GA
Keshi Chen - Duluth GA
Mehdi Khosravi - Roswell GA

Assignee:

Iterated Systems, Inc. - Atlanta GA

International Classification:

G06K 936

US Classification:

382249

Abstract:

The methods of the invention can be used with image data divided into domain blocks. A predetermined search pattern of range blocks centered on a domain block is defined for use in the methods. The first method includes a step of generating at least one error descriptor data based on domain block data and range block data. The error descriptor data can be derived by scaling the range blocks to the pixel size of a domain block, and subtracting the means of the range blocks and domain block from each pixel thereof. The mean-adjusted, scaled pixel intensity levels of the scaled range blocks are subtracted from mean-adjusted pixel intensity levels of the domain block to produce difference data. The absolute value of the difference data is taken and the positive difference data are summed to produce summed error data for each range block. The summed error data is used to derive at least one error descriptor data for the image.

US Patent:

57901317, Aug 4, 1998

Filed:

May 15, 1996

Appl. No.:

8/648345

Inventors:

Gang Liang - Norcross GA
Stephen Demko - Atlanta GA
Jarkko Kari - Atlanta GA
Keshi Chen - Dunwoody GA

Assignee:

Iterated Systems, Inc. - Atlanta GA

International Classification:

G06F 1500

US Classification:

345439

Abstract:

A system and method compresses datasets so compressed representations corresponding to a predetermined target file size are generated. The system includes a lossy compressor which selects a compressed representation for components of an original data set. The size of the compressed representations generated by the compressor are measured and used with the cost parameters for a parameterized non-linear relationship between cost parameter and compressed representation sizes. The parameters may be used to adjust the cost parameter so the compressor generates compressed representations that correspond to a target size. The adjustment of the cost parameter causes the compressor to select different compressed representations for the components of the original dataset and correspondingly alters the size of the compressed representation.

US Patent:

57547041, May 19, 1998

Filed:

Mar 10, 1995

Appl. No.:

8/401672

Inventors:

Michael F. Barnsley - Duluth GA
Lyman P. Hurd - Dunwoody GA
Stephen Demko - Atlanta GA

Assignee:

Interated Systems, Inc. - Norcross GA

International Classification:

G06K 936
G06K 946

US Classification:

382249

Abstract:

A method and apparatus are described for-encoding a three-dimensional array of data representing a physical entity, such as an image (or sequence of frames), by means of its local symmetries. This encoding yields both compression and a resolution-independent description which allows reconstruction of the image to an arbitrary scale. Spatial zooming and interframe interpolation can be achieved without significant loss of information.