Inventor

HECHT DAVID L

US57 patents

⚠️ This page may combine multiple inventors who share the name “HECHT DAVID L”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

HECHT DAVID L

XEROX CORP

Orientational disambiguation for self-clocking glyph codes

Parallel propagating embedded binary sequences for characterizing objects in N-dimensional address space

Quasi-reprographics with variable embedded data with applications to copyright management, and distribution control

Interleaved and interlaced sync codes and address codes for self-clocking glyph codes

Framing codes for robust synchronization and addressing of self-clocking glyph codes

Global addressability for self-clocking glyph codes

Explicit synchronization for self-clocking glyph codes

Methods and means for reducing bit error rates in reading self-clocking glyph codes

Convolution filtering for decoding self-clocking glyph shape codes

Systems and methods for forgery detection and deterrence of printed documents

Multi-level selection methods and apparatus using context identification for embedded data graphical user interfaces

Tilings of mono-code and dual-code embedded data pattern strips for robust asynchronous capture

Automatic geometric image transformations using embedded signals

Random access techniques for use with self-clocking glyph codes

Authentication process

Method and apparatus for implementing a camera mouse

Self-clocking glyph shape codes

Method and apparatus for decoding angular orientation of lattice codes

Self-clocking glyph code having composite glyphs for distributively encoding multi-bit digital values

Hardcopy lossless data storage and communications for electronic document processing systems

Use of correlation histograms for improved glyph decoding

Foreground/background document processing with dataglyphs

Distributed dimensional labeling for dimensional characterization of embedded data blocks

Parallel propagating embedded binary sequence for parameterizing two dimensional image domain code patterns in two dimensional address space

Vector reconstruction of asynchronously captured tiled embedded data blocks

Method to provide optimum optical contrast for registration mark detection

Spot profile control using fractional interlace factors in a polygon ROS

Microaddressability via overscanned illumination for optical printers and the like having high gamma photosensitive recording media

Operations on images having glyph carpets

Self-clocking glyph shape codes

Method and apparatus for display of spatially registered information using embedded data

System and method for distributing multilingual documents

Record and related method for storing encoded information using overt code characteristics to identify covert code characteristics

Machine-readable record with a two-dimensional lattice of synchronization code interleaved with data code

Hand-propelled wand printer

Defect compensation for discrete image bars

Interpixel null suppression for optical image bars

Electrooptic TIR light modulator image bar having spatial filter for optimizing spatial frequency response

Electrooptic TIR light modulator image bar having multiple electrodes per pixel

Variable wavelength discrete optical image bars having passively enhanced spatial addressing capacity

Exclusive or cross-coupled framing codes for self-clocking glyphs

Parallel propagating embedded binary sequences for parameterizing two dimensional image domain code patterns in N-dimensional address space

Electrooptic TIR light modulator image bar having illumination conditions for optimizing spatial frequency response

XEROX PARC

Methods and apparatus for robust decoding of glyph address carpets

Glyph address carpet methods and apparatus for providing location information in a multidimensional address space

Methods and apparatus for camera pen

PALO ALTO RES CT INC

Three-dimensional active vision with glyph address carpet

Optical beam position active sensing using satellite beams

FUJI XEROX CO LTD

System and method for video access from notes or summaries

ITEK CORP

Second order birefringent acousto-optic device