E.i. Dupont De Nemours and Company

Mark E Faulhaber

Edmund H Smith, Jr

James M Prober

Charles M Paulson, Jr

Robert M Taylor

Mark A Momcilovich

A method and apparatus for generating raster image information for displaying both images and border areas in a single display comprising selecting one of a predetermined number of density values available for the image display to represent the border areas and remapping the image densities to the remaining density values.

Raster image processing with pixel mapping to allow image border density

A method for correcting image exposure and positional errors, arising from the components and geometry of a scanning system, wherein compensating electronic signals are generated to modulate the image data in order to correct said errors.

Error reduction methods in scanning systems

The size of a digitally-stored image is modified as desired by expanding the source image data and adjusting the input to the output raster display device accordingly.

Method and apparatus for producing a specified format output image from

The pixel clock of a system for receiving, sampling, and digitally storing the information contained in an analog sampled-data video signal is automatically synchronized and stabilized so that the received data is sampled by said system at or near the center of each successive received pixel period. A preset counter is employed to determine whether the receiving system clock is running at a predetermined number of pixel periods per horizontal sweep; any variation from the predetermined number is sensed and converted to a DC voltage level which is used to adjust the receiving system clock automatically to the correct number of periods per sweep. Synchronization of the receiving system clock is accomplished by triggering it with the sync pulse portions of the received video signal.

Synchronous sampling system

A random pulse generator which includes a voltage-to-frequency converter coupled to a voltage source providing a random voltage sequence, produces a train of logic pulses that can be randomized in a multi-mode manner on either a pulse rate or period basis with control over the percent variability. The durations of the on-off portions of the pulse train are separately adjustable.

Random pulse generator circuit

An inspection system of the type having a rotating multifaceted mirror and a radiation collecting arrangement is characterized by a network in which the signal representative of the web being inspected is compensated for deviations superimposed on that signal due to variations in the reflectivity among the various mirror facets and normalized for variations in the optical efficiency of the radiation collecting arrangement.

Web inspection system having a product characteristic signal normalizing

An apparatus for measuring the degree and direction of molecular orientation in film as it advances from a stretching zone. The apparatus includes a detection circuit which receives synchronous and sinusoidal reference and analytical signals based on a beam of rotating linearly polarized light.

Apparatus for measurement of molecular orientation

Presence and location of infrared radiation-absorbing or emitting gases in the atmosphere can be ascertained by means of an infrared imaging-analyzing means which views a given scene and receives infrared radiation therefrom. Analytic and reference beams are produced, the latter having reduced sensitivity to the gas of interest, and are converted to electric signals, which are processed in real time to provide a signal corresponding to their ratio. This ratio signal is further processed to generate an image, which can be displayed and viewed. This technique is particularly suitable for surveying large areas for seepage of methane or other hydrocarbon gases from underground gas and/or oil deposits.

Method and apparatus for remotely detecting gases in the atmosphere

Method and apparatus for defect identification with normalizing of the optical-electrical inspection system gain function of scans across a full width of running product web in order to facilitate defect amplitude discrimination within the uneven portions of repetitive scan signals, and then, after accumulating a preselected number of gain-normalized scans, identifying protracted duration defect-related signals by amplitude discrimination.

Defect identification with normalizing of gain function in

In a yarn inspection system for detecting variations in yarn diameter wherein a plurality of yarns move past a plurality of transducers for generating electrical signal outputs corresponding to yarn diameter and including discriminator circuitry sequentially connected to each of the transducers for processing the signal outputs, a self calibrating circuit arrangement has been devised to compensate for normal variations in the output of individual transducers due to different characteristics among the separate transducers.

Yarn detector with a self-calibrating circuit

An automatically calibrated flying spot web inspection system adapted to detect transverse (or roll mark) defects and discriminate these defects from other defect types. Electronic circuit means responsive to a beam of radiation in either the reflection mode or the transmission mode detect and discriminate these defects from the other types.

Optical-electrical web inspection system

An electrical signal ratioing circuit for a source delivering an electric analog pulse signal sequence having compensating means for removing the effects of background influences, such as amplifier signal offsets and extraneous illumination, and integrating means eliminating the effect of line voltage variations and changes in optical and electrical system gains on the ratios so produced.

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Wilmington, DE, United States of America

Mark E Faulhaber