EP0519040A1 - Procede et appareil d'enregistrement de lecture d'une image - Google Patents

Procede et appareil d'enregistrement de lecture d'une image

Info

Publication number
EP0519040A1
EP0519040A1 EP19920902631 EP92902631A EP0519040A1 EP 0519040 A1 EP0519040 A1 EP 0519040A1 EP 19920902631 EP19920902631 EP 19920902631 EP 92902631 A EP92902631 A EP 92902631A EP 0519040 A1 EP0519040 A1 EP 0519040A1
Authority
EP
European Patent Office
Prior art keywords
image
radiation
colors
wavelengths
medium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19920902631
Other languages
German (de)
English (en)
Inventor
Hugh Stewart Allen Gilmour
David Clayton Shuman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US07/634,636 external-priority patent/US5172230A/en
Priority claimed from US07/634,621 external-priority patent/US5245418A/en
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of EP0519040A1 publication Critical patent/EP0519040A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00002—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for
    • H04N1/00026—Methods therefor
    • H04N1/00037—Detecting, i.e. determining the occurrence of a predetermined state
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00002—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00002—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for
    • H04N1/00026—Methods therefor
    • H04N1/0005—Methods therefor in service, i.e. during normal operation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00002—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for
    • H04N1/00026—Methods therefor
    • H04N1/00063—Methods therefor using at least a part of the apparatus itself, e.g. self-testing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00002—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for
    • H04N1/00071—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for characterised by the action taken
    • H04N1/00074—Indicating or reporting
    • H04N1/00076—Indicating or reporting locally
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00002—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for
    • H04N1/00092—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for relating to the original or to the reproducing medium, e.g. imperfections or dirt
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/409—Edge or detail enhancement; Noise or error suppression
    • H04N1/4097—Removing errors due external factors, e.g. dust, scratches
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46—Colour picture communication systems
    • H04N1/48—Picture signal generators
    • H04N1/486—Picture signal generators with separate detectors, each detector being used for one specific colour component
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/11—Scanning of colour motion picture films, e.g. for telecine

Definitions

  • This application relates to a method and apparatus for recording and reading an image, and more particularly, to such a method and apparatus for recording and reading a multicolor image.
  • the recording medium can be a major contributor to signal errors. Missing or spurious signals induced by media defects cause data loss or contamination of the recorded information. Consequently, error detection and correction (EDAC) capability is incorporated into recording and playback systems. Such capability is usually in the foirtn of software programs to encode and decode signals.
  • EDAC error detection and correction
  • redundancy is built in by signal coding.
  • playback the signal is verified or corrected by a deciphering code.
  • the proportion of a recording medium which is dedicated to error correction can be significant; for example, thirty percent is not unusual. Higher redundancy is required if the medium is imperfect, or if a very low error content is needed. Bit error rates of one in 10 ⁇ 3 or less are sought in some applications. With present technology, optical media can not be manufactured to that degree of perfection.
  • a method of reading an image on an image-bearing medium comprising the steps of: directing radiation containing a plurality of wavelengths onto the medium; sensing each of the wavelengths at each pixel of the image and producing signals representative of the densities of the colors in the pixel; and determining the relationship of the densities of the colors in each of the pixels.
  • apparatus for reading an image on an image-bearing medium, the image being formed from a plurality of colors, each pixel in the image containing the colors in a predetermined relationship
  • the apparatus comprising: a source of radiation for directing radiation containing a plurality of wavelengths onto the medium; detector means for sensing each of the wavelengths at each pixel of the image and for providing signals representative of the densities of the colors in the pixel; and signal processing means for processing the signals from the detector means, the signal processing means including means for determining the relationship of the colors in each of the pixels and for providing an output indicative of whether the information in the pixel is valid.
  • a recording medium in the form of a web is supported for movement in a page scan, or cross-scan, direction.
  • the medium can be, for example, a film having a blue colloidal silver coating.
  • a yellow image is formed on the blue coating, and there is a predetermined relationship between the blue and the yellow in each pixel of the image.
  • a galvanometer scans a laser beam across the recording medium in a scan direction.
  • a diode laser which is driven in accordance with an information signal, supplies the laser beam to the galvanometer through a collimator lens and beam shaping optics.
  • an unmodulated beam of radiation from the diode laser is divided into two different wavelengths of radiation and the dual- wavelength beam is directed to the galvanometer.
  • the galvanometer scans the beam across a recording medium having a color image recorded thereon. After the beam passes through the recording medium, the beam is intercepted by a dual-wavelength detector which provides signals representative of the densities of radiation in the two wavelengths.
  • the signals are directed to signal-processing means which produces a signal indicative of whether each picture element or pixel in the image is valid information.
  • a principal advantage of the present invention is that errors in a recording medium can be detected without using large areas of the recording medium for error correction.
  • a further advantage is that error detection in an optical recording system can be performed without elaborate software schemes for coding and decoding the data.
  • the present invention is particularly suitable for producing an optical recording of binary data which is relatively error free.
  • Fig. 1 is a schematic perspective view of the apparatus of the present invention
  • Fig. 2 is a schematic representation showing elements of the apparatus of the present invention which are used in the read mode
  • Fig. 3 is a schematic drawing of a signal processing circuit for use in the present invention
  • Fig. 4 is a schematic drawing of a signal processing circuit for producing a signal indicative of whether a defect is opaque or transparent;
  • Fig. 5 is a schematic drawing of a signal processing circuit which combines the features of the circuits shown in Figs. 3 and 4;
  • Fig. 6 is a graph showing the signals produced by a two-color medium when read with a two- wavelength source of radiation.
  • apparatus 10 constructed in accordance with the present invention.
  • Apparatus 10 comprises a source of radiation 14 which produces a beam of radiation 16 that is modulated in accordance with an information signal.
  • Beam 16 is directed to a galvanometer 20 through a collimating lens 22, beam shaping optics 24, and a turning mirror 23.
  • Beam shaping optics 24 includes a pair of cylindrical lenses 25 and 26.
  • Galvanometer 20 is adapted to scan the beam onto a receiving medium 30.
  • the beam 16 from galvanometer 20 passes through an f- ⁇ lens 32 which functions in a well-known manner to maintain a flat field and a constant velocity of the scanned spot on the recording medium.
  • Apparatus 10 is adapted to operate in a record, or write, mode in which information is recorded on medium 30.
  • receiving medium 30 extends in the form of a web between a supply roll 42 and a take-up roll 44.
  • Rolls 42 and 44 can be driven, for example, by a stepper motor (not shown) which is actuated in timed relation to the scan movement of galvanometer 20 to advance the medium 30 in a cross- scan direction.
  • apparatus 10 can also be operated in a read mode to check for errors in the information recorded on medium 30 and/or electronically record the image on the medium.
  • a multiwavelength detector 40 located behind the medium, is used in the read mode.
  • Radiation source 14 can include a laser 43, for example, a diode laser which emits radiation at 830nm.
  • a laser for example, a diode laser which emits radiation at 830nm.
  • One suitable laser is a Model SDL-24200H2 laser manufactured by Spectrodiode Laboratories.
  • Source 14 also includes a driver 44 for laser 43 and a frequency doubler device 46 which can be selectively moved into the path of the output beam from diode laser 43.
  • Frequency doubler device 46 is used in the read mode for error detection in a manner to be e.xplained below.
  • Device 46 includes a beam splitter 48 which passes one portion of the beam to a beam equalizer 50 and another portion of the beam to a turning mirror 52.
  • the beam portion passes through a frequency doubler element 54 which produces an output beam at one-half the wavelength of the input beam.
  • the output beam is directed by means of a turning mirror 58 to a dichroic mirror 56 which serves to recombine the two beam portions to form beam 16.
  • the beam 16, which in the read mode for error detection contains wavelengths of 830 nm and 415 nm, is then directed to the galvanometer 20.
  • the frequency doubler element 54 can be a Model KDP, obtainable from Cleveland Crystal Co., or a lithium niobate device obtainable from the same company.
  • the beam equalizer 50 can be a circular wedge neutral density filter, No. 03FDC003, obtainable from Melles Griot Co. It will be apparent to those skilled in the art that the multiwavelength beam could be produced in uthe ways, e.g., by combining the beams from two separate sources of radiation or by using a broad-band light source in combination with wavelength selective filters.
  • the recording medium in the present invention can be any medium which records information in color, for example, films containing thermochromic compounds and mediums in which a color coupler is converted into a color image dye to record a signal.
  • a preferred recording medium is a film coated with a metastable silver coating, for example, as disclosed in European Patent Publication No. 0395096, entitled ⁇ Method of Thermally Forming Images From Metastable Metal Colloids," published on 31 October, 1990; this application is assigned to the assignee of the present invention.
  • a thermal image can be formed on the medium having a blue metastable colloidal silver coating by providing sufficient heat to significantly raise the temperature of the silver layer. In the areas where heat is applied to the blue colloidal silver, the blue is changed to yellow. Such heat can be provided, for example, by a short duration pulse from a diode laser.
  • the background color of the metastable silver need not be blue.
  • apparatus 10 can be operated in a read mode.
  • beam 16 would be scanned across medium 30 in the manner described above, and light transmitted through the medium would be sensed to electrically record the image on the medium.
  • recording errors in the medium 30 can be checked.
  • the frequency doubler 46 would be inserted in the optical path, and the beam containing the two wavelengths would be scanned onto the receiving medium 30.
  • Detector 40 would produce signals representing the densities of the two wavelengths to signal processing circuitry 60.
  • a picture element, or pixel, exposed on the blue colloidal silver will have blue areas and yellow areas.
  • two estimates of pixel exposure can be obtained: one from the blue transmission signal and one from the red transmission signal.
  • the image of a continuous tone object can be read as a negative or a positive. Reading the
  • a signal from a blue detector (not shown) in detector 40 would pass through a signal inverter 66, a pulse gate and binary converter 68, and then to AND gate 64.
  • a HIGH output from .AND gate 64 would indicate a valid data point.
  • the pulse gate and binary converters 62 and 68 can each be a Model No. NE527, made by Signetics Co.
  • the .AND gate 64. can be a No. SN74ALS00, obtainable from Texas Instruments Co.
  • circuit 70 for determining whether a defect is the result of a scratch or dirt.
  • a signal from the blue detector is passed to a pulse gate and binary converter 72 and to another pulse gate and binary converter 74 through a signal inverter 76.
  • a signal from the IR detector is passed to a pulse gate and binary converter 78 and to another pulse gate and binary converter 80 through a signal inverter 82.
  • Signals from pulse gate and binary converters 72 and 78 are passed to .AND gate 84.
  • a signal from AND gate 84 is fed to OR gate 86.
  • a HIGH output from AND gate 84 would indicate a scratch, since both the blue and IR signals would be high.
  • Signals from pulse gate and binary converters 74 and 80 are fed to AND gate 88, and a High output from AND gate 88 would indicate dirt, since signals from both the blue and IR detectors would be low.
  • a HIGH output from OR gate 86 would indicate that either a scratch or dirt was present on medium 30.
  • a circuit 90 in Fig. 5 functions in the same manner as circuit 70 to indicate when either a scratch or dirt is present.
  • an .AND gate 92 receives signals produced in the manner described above for circuit 60 and produces a HIGH output when a valid pixel is present.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • General Health & Medical Sciences (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

On décrit un procédé et un appareil servant à enregistrer et à lire une image couleur produite sur un support d'enregistrement (30) tel qu'une pellicule enduite d'argent colloïde bleu métastable. Lorsque de la chaleur est appliquée à des zones choisies de la couche de recouvrement, l'argent bleu vire au jaune pour produire une image. En mode d'enregistrement, un faisceau modulé provenant d'un laser à diodes (43) balaye le support d'enregistrement pour former une image. En mode lecture, un faisceau laser à diodes contenant deux rayonnements de différentes longueurs d'onde balaye toute la surface d'une image formée sur le support d'enregistrement. Afin de détecter des erreurs dans l'image, un détecteur (40) détecte les deux longueurs d'onde au niveau de chaque pixel et produit des signaux indiquant les densités de jaune et de bleu dans le pixel. Des moyens (60) de traitement de signaux sont agencés pour déterminer des points de données valables provenant des deux signaux.
EP19920902631 1990-12-27 1991-12-03 Procede et appareil d'enregistrement de lecture d'une image Withdrawn EP0519040A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US634636 1990-12-27
US07/634,636 US5172230A (en) 1990-12-27 1990-12-27 Apparatus for recording and reading an image on a medium and detecting errors and media defects
US634621 1990-12-27
US07/634,621 US5245418A (en) 1990-12-27 1990-12-27 Method for recording a color image on a medium and reading an image recorded on a medium

Publications (1)

Publication Number Publication Date
EP0519040A1 true EP0519040A1 (fr) 1992-12-23

Family

ID=27092195

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920902631 Withdrawn EP0519040A1 (fr) 1990-12-27 1991-12-03 Procede et appareil d'enregistrement de lecture d'une image

Country Status (3)

Country Link
EP (1) EP0519040A1 (fr)
JP (1) JPH05505053A (fr)
WO (1) WO1992012514A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9026258B2 (en) 2008-08-23 2015-05-05 Dewind Co. Method for controlling a wind farm

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4517589A (en) * 1981-10-13 1985-05-14 Canon Kabushiki Kaisha Colored image reading apparatus
GB2138244B (en) * 1983-04-11 1987-03-11 Fuji Xerox Co Ltd Method and apparatus for reading color image
US4595947A (en) * 1983-10-24 1986-06-17 Xerox Corporation Light collection by elliptical cylinder mirrors for raster input scanners
EP0348090A1 (fr) * 1988-06-22 1989-12-27 Konica Corporation Système et appareil d'entrée d'images en couleurs

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9212514A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9026258B2 (en) 2008-08-23 2015-05-05 Dewind Co. Method for controlling a wind farm

Also Published As

Publication number Publication date
JPH05505053A (ja) 1993-07-29
WO1992012514A1 (fr) 1992-07-23

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