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| Number | Title | Issue Date |
| 8087589 | Laser barcode scanner employing heterodyning techniques A system and method of scanning machine-readable symbols with a signal source modulated by a local oscillator to create by heterodyne mixing upconverted signals at the sum and difference frequencies of the local oscillator frequency and the frequency of the time-var... | 01/03/2012 |
| 7556200 | Methods and apparatus for reducing the influence of noise in an optical scanning system Systems and techniques for eliminating or compensating for noise affecting a bar code scanner. A scanner is operated in a learning mode under conditions designed to insure that a scan signal will take on predictable characteristics and noise affecting the scan signa... | 07/07/2009 |
| 7380721 | Low-cost compact bar code sensor A barcode sensor package has an optical emitter circuit and an optical detector circuit which are formed as one or more integrated optical circuits disposed in a housing which has a reading surface and one or more apertures located between the optical emitter and de... | 06/03/2008 |
| 7350758 | Module for mounting a MEMS device A module for mounting a micro-electromechanical system (MEMS) device includes a base having a first support and a second support. The second support has a support guide feature. The module also includes a bracket attached to the MEMS device. The bracket has a centra... | 04/01/2008 |
| 7303133 | Imaging module An imaging module, which prevents a board on which an imaging device is mounted from being cracked by an impact, reduces a deviation between an imaging device and an optical axis of a lens system due to a temperature change and has high reliability, is obtained. The... | 12/04/2007 |
| 7278577 | Image input system An image input system includes a solid state image pickup device and a preprocessor for performing correlated double sampling amplification on an output of the image pickup device and outputting a video signal. The preprocessor has a correlated double sampling ampli... | 10/09/2007 |
| 7255280 | Electronically-controlled mechanically-damped off-resonant light beam scanning mechanism and code symbol readers employing the same Apparatus for deflecting a light beam, comprising: a scanning element having a base portion, a light beam deflecting portion, and a gap region disposed therebetween. The base portion is anchored with respect to an optical bench to permit the light beam deflecting po... | 08/14/2007 |
| 7204423 | Bar code signal processing A low pass filter that approximates a Gaussian transfer function filters the analog bar code signal prior to digitization is used to smooth the bar code signal. The Gaussian filter has a transfer function that compensates for beam distortion close in to the bar code... | 04/17/2007 |
| 7124949 | Reducing speckle noise in electro-optical readers The influence of speckle noise in degrading performance of a reader for electro-optically reading a multiple element symbol is reduced by constructing wavelets for each element width, correlating each wavelet with a differentiated signal derived from light scattered... | 10/24/2006 |
| 7104450 | Optical scanner assembly and related methodology An optical scanner may be used either with or without a support stand. When operated without the support stand, the scanner may be used to acquire an image of an object in virtually any location and/or orientation, e.g., an image of a picture hanging on a wall. When... | 09/12/2006 |
| 7100831 | Method and apparatus for processing read-out images A scanning device or alight beam is moved for reciprocal scanning with respect to an image carrier, which carries image information thereon, and in a main scanning direction. The scanning device or the light beam is also moved with respect to the image carrier and i... | 09/05/2006 |
| 7086595 | METHOD OF AND APPARATUS FOR PROCESSING CAPTURED DIGITAL IMAGES OF OBJECTS WITHIN A SEMI-AUTOMATIC HAND-SUPPORTABLE IMAGING-BASED BAR CODE SYMBOL READER SO AS TO READ 1D AND/OR 2D BAR CODE SYMBOLS GRAPHICALLY REPRESENTED THEREIN Method of and apparatus for processing captured images within a semi-automatic hand-supportable imaging-based bar code symbol reader in order to read 1D and/or 2D bar code symbols graphically represented therein. The semi-automatic hand-supportable digital imaging-b... | 08/08/2006 |
| 7083101 | Bar-code reader and method of reading bar-code A signal obtained by optically scanning a bar code is subjected to differentiation to obtain differential data. Peak-to-peak distances are calculated from the differential data. When a peak-to-peak ΔTx distance is y times of a basic width, frequency f(x,y) will be,... | 08/01/2006 |
| 7077323 | Bar code recognizing method and decoding apparatus for bar code recognition A bar code is scanned and a line of image data is extracted in a process. The line of extracted image is divided into patterns forming characters in a process. The divided patterns are converted into characters in a process. In the process, a pattern is divided by t... | 07/18/2006 |
| 7070107 | Led-based planar light illumination and imaging (PLIIM) systems A planar light illumination and imaging system for illuminating an object and forming an image thereof. The planar light illumination and imaging system which comprises an image formation and detection module having a field of view (FOV) focused at an image detectin... | 07/04/2006 |
| 7051937 | System and method for fast binarization of bar codes in the presence of noise A system and method to binarize the bar code image in the presence of noise in order to render bar codes more detectable in the presence of noise. The method of this invention includes the steps of applying a gradient detecting filter to the bar code image, obtainin... | 05/30/2006 |
| 7021546 | Bar-code reader and method of reading bar-code In a bar-code generally number of modules corresponding to each character is seven. However, if the number of modules judged from the data obtained by reading a bar code is, for example, six, the character is demodulated using a demodulation-pattern table correspond... | 04/04/2006 |
| 6971575 | HAND-SUPPORTABLE PLANAR LASER ILLUMINATION AND IMAGING (PLIIM) DEVICE EMPLOYING A PAIR OF LINEAR LASER DIODE ARRAYS MOUNTED ABOUT AN AREA IMAGE DETECTION ARRAY, FOR ILLUMINATING AN OBJECT TO BE IMAGED WITH A PLURALITY OF OPTICALLY-COMBINED SPATIALLY-INCOHERENT PLANAR LASER ILLUMINATION BEAMS (PLIBS) SCANNED THROUGH THE FIELD OF VIEW (FOV) OF SAID AREA IMAGE DETECTION ARRAY, AND REDUCING THE SPECKLE-PATTERN NOISE POWER IN DETECTED 2-D IMAGES BY TEMPORALLY-AVERAGING DETECTED SPECKLE-NOISE PATTERNS A hand-supportable area-type planar laser illumination and imaging (PLIIM) based device comprising an area-type image formation and detection (IFD) module having a 2-D array of image detection elements. The IFD module also includes image formation optics having a 3-... | 12/06/2005 |
| 6945462 | Optical information reading apparatus An optical information reading apparatus applies light to an object to be read such as a bar code symbol, photoelectrically converts by a photodetector element a light image formed by the reflection light, and processes the obtained electric signal to output code da... | 09/20/2005 |
| 6874688 | Data collection signal processing for increased performance in electro-optical readers Signal processing performance in electro-optical readers is improved by changing filter characteristics and/or digitizer thresholds during successive scans. ... | 04/05/2005 |
| 6871785 | Method and device for compensating undesired variations in an electrical signal generated by an optical code reader The method for compensating undesired variations in an electrical signal generated by a sensor of an optical code reader comprises the steps of generating an envelope signal starting from the electrical signal generated by the sensor and normalizing the electrical s... | 03/29/2005 |
| 6783073 | Image input system An image input system includes a solid state image pickup device and a preprocessor for performing correlated double sampling amplification on an output of the image pickup device and outputting a video signal. The preprocessor has a correlated double sampling ampli... | 08/31/2004 |
| 6758401 | Methods for operating a code reader, and a code reader A method for operating a code reader and a code reader. According to the method, laser light is transmitted from a laser light source to illuminate an object having a code, wherein the laser light is amplitude-modulated to reduce the speckle noise of the light illum... | 07/06/2004 |
| 6736321 | Planar laser illumination and imaging (PLIIM) system employing wavefront control methods for reducing the power of speckle-pattern noise digital images acquired by said system A planar laser illumination and imaging (PLIIM) based system employing wavefront control methods for reducing the power of speckle-pattern noise within digital images acquired by the system. The system comprises a housing having a first light transmission aperture, ... | 05/18/2004 |
| 6616046 | Techniques for miniaturizing bar code scanners including spiral springs and speckle noise reduction Various techniques for reducing the size of bar code scanner modules are disclosed including embodiments having miniature moving mirror elements employing spiral tape springs and micro machined structures. Other embodiments employ VCSELs and relatively sm... | 09/09/2003 |
| 6527186 | Scan data signal processor employing band-pass filter having frequency response characteristics controlled by the depth of focus of the laser scanning beam The effects of paper/substrate noise are significantly reduced in multi-focal zone laser scanning systems by processing analog scan data signals with a scan data signal processor having a plurality of pass-band filters and amplifiers that are automaticall... | 03/04/2003 |
| 6497366 | Methods and apparatus for dual channel video recovery in bar code scanners A dual channel video data recovery system for use in a bar code scanner. A first and a second video signal are generated in parallel in response to light reflected from a bar code. The first and second video signals are received and filtered to limit thei... | 12/24/2002 |
| 6042012 | Method and apparatus for reading images without need for self-generated illumination source A method and apparatus for reading bar codes or other images while reducing or eliminating the need for self-generated illumination. An image reader is preferably embodied as a handheld unit and comprises an efficient optical collection system including a... | 03/28/2000 |
| 5965864 | Slicing ratio controlling circuit A slicing ratio controlling circuit for controlling the ratio of a slice level used when binarizing an input signal with respect to the signal to be sliced, including a differentiating unit for differentiating the input signal; a peak holding unit for rec... | 10/12/1999 |
| 5923023 | Method and apparatus for detecting transitions in an input signal A method and apparatus for determining the transitions between binary levels of an input signal such as a scanned bar code label by detecting zero crossings of an approximated second derivative of the input signal. Samples of the input signal are obtained... | 07/13/1999 |
| 5917170 | Method for the evaluation of information stored in bar codes A method for the evaluation of information stored in bar codes composed of characters is proposed, in which the bar code is exposed to light by means of a light source and the light reflected from the bar code is detected by means of a light receiving dev... | 06/29/1999 |
| 5914478 | Scanning system and method of operation with intelligent automatic gain control A bar code scanner and method of operation includes intelligent AGC to maintain a constant signal level while not delaying a decoder in identifying indicia when noise or specular reflection occurs during a scan period. A light detector receives light and ... | 06/22/1999 |
| 5777311 | Optoelectronic a device employing a digital filter which operates in different coefficient sets An optoelectronic device for identifying a mark having a defined contrast pattern includes a transmitting element for emitting a beam of transmitted light. A deflector unit periodically guides the transmitted light beam over the mark. A receiving element ... | 07/07/1998 |
| 5734152 | Optical scanners and signal processors therefor An optical scanning system is provided for producing a signal representative of a spatial distribution of indicia having different degrees of reflectivity to light, such as a bar code. The system includes an optical scanner for scanning beam of light over... | 03/31/1998 |
| 5675136 | Optoelectric device for the recognition of contrast marks An optoelectronic device for recognizing marks provided with defined contrast patterns includes a transmitting element that transmits a light beam and a receiving element. The beam of transmitted light is guided across the marks, and the received beam of ... | 10/07/1997 |
| 5661288 | Optoelectronic device including digital filters compensating for component stipulated signal distortion in a recieved signal for recognizing barcode symbols An optoelectronic apparatus is provided for identifying marks comprised of defined contrast patterns, particularly barcode symbols. The device includes a transmitting element which emits transmitted light and a receiving element. The transmitted light is ... | 08/26/1997 |
| 5637853 | Reading indicia by analysis of different light reflecting portions based on signal-to-noise ratios A reader for reading a bar code symbol consisting of badly printed bars on a clean background generates a signal having portions corresponding to the different light reflectivities of the bars and the spaces. Those portions of the signal corresponding to ... | 06/10/1997 |
| 5557094 | False-transition inhibitor circuit for a bar code reader A false-transition inhibitor circuit for a bar code reader that produces a detection signal from a scan of a bar code, a first derivative signal related to the first derivative of the detection signal, and a peak signal indicating peaks of the detection s... | 09/17/1996 |
| 5532469 | Hand held bar code reader with input and display device and processor A scanning head for reading bar code signals including a laser source producing a beam which is scanned across a symbol to be read by a moving mirror arrangement, and a photodetector responsive to light reflected from the symbol. The signal from the photo... | 07/02/1996 |
| 5528022 | Symbol read device A symbol read device useful as a bar code reader, optical character reader or the like. A symbol bearing surface is illuminated by two different light sources that are distinguishable based on their respective wavelengths or modulated frequencies. A detec... | 06/18/1996 |
