FR2361786A1 - METHOD AND DEVICE FOR CORRECTING FAULTS DURING A FAC-SIMILE TRANSMISSION - Google Patents

METHOD AND DEVICE FOR CORRECTING FAULTS DURING A FAC-SIMILE TRANSMISSION

Info

Publication number
FR2361786A1
FR2361786A1 FR7724601A FR7724601A FR2361786A1 FR 2361786 A1 FR2361786 A1 FR 2361786A1 FR 7724601 A FR7724601 A FR 7724601A FR 7724601 A FR7724601 A FR 7724601A FR 2361786 A1 FR2361786 A1 FR 2361786A1
Authority
FR
France
Prior art keywords
line
transmission
image
disturbed
parts
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.)
Granted
Application number
FR7724601A
Other languages
French (fr)
Other versions
FR2361786B1 (en
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 NL7608862A external-priority patent/NL7608862A/en
Priority claimed from DE19772719419 external-priority patent/DE2719419A1/en
Application filed by Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of FR2361786A1 publication Critical patent/FR2361786A1/en
Application granted granted Critical
Publication of FR2361786B1 publication Critical patent/FR2361786B1/fr
Granted 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
    • H04N1/41—Bandwidth or redundancy reduction
    • H04N1/411—Bandwidth or redundancy reduction for the transmission or storage or reproduction of two-tone pictures, e.g. black and white pictures
    • H04N1/413—Systems or arrangements allowing the picture to be reproduced without loss or modification of picture-information
    • H04N1/419—Systems or arrangements allowing the picture to be reproduced without loss or modification of picture-information in which encoding of the length of a succession of picture-elements of the same value along a scanning line is the only encoding step
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M5/00—Conversion of the form of the representation of individual digits

Abstract

Lors d'une transmission en fac-similé, les successions de points d'image ayant la même luminosité sont transmis sous forme codée. Dans le cas d'une perturbation au cours de la transmission, on reçoit des lignes d'image trop longues ou trop courtes. Selon la présente invention, il est proposé dans le cas d'une ligne d'image reçue perturbée, de comparer cette ligne à une ou respectivement aux deux lignes d'image voisines, de mettre en mémoire les parties présentant une corrélation suffisante et, en ce qui concerne l'emplacement des parties perturbées, de décaler la fin de la ligne d'image perturbée de telle façon que la ligne définitive reconstituée ait la longueur prescrite, les parties n'ayant pas une corrélation suffisante étant remplacées par l'information correspondante contenue dans une des deux lignes d'image voisines. Application à la transmission de fac-similé.In facsimile transmission, successions of image points having the same brightness are transmitted in coded form. In the event of a disturbance during transmission, image lines that are too long or too short are received. According to the present invention, it is proposed in the case of a disturbed received image line, to compare this line with one or respectively with two neighboring image lines, to store the parts having sufficient correlation and, in as regards the location of the disturbed parts, to shift the end of the disturbed image line so that the reconstructed final line has the prescribed length, the parts not having sufficient correlation being replaced by the corresponding information contained in one of the two neighboring image lines. Application to the transmission of facsimiles.

FR7724601A 1976-08-10 1977-08-10 METHOD AND DEVICE FOR CORRECTING FAULTS DURING A FAC-SIMILE TRANSMISSION Granted FR2361786A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL7608862A NL7608862A (en) 1976-08-10 1976-08-10 SCHEME FOR TRANSMISSION OF CODED MESSAGES WITH A REDUCED TRANSMISSION TIME.
DE19772719419 DE2719419A1 (en) 1977-04-30 1977-04-30 Graphic transmission system faults correction - compares line image signals with corresponding signals in memory

Publications (2)

Publication Number Publication Date
FR2361786A1 true FR2361786A1 (en) 1978-03-10
FR2361786B1 FR2361786B1 (en) 1984-09-21

Family

ID=25771953

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7724601A Granted FR2361786A1 (en) 1976-08-10 1977-08-10 METHOD AND DEVICE FOR CORRECTING FAULTS DURING A FAC-SIMILE TRANSMISSION

Country Status (7)

Country Link
JP (1) JPS5337313A (en)
AU (1) AU511668B2 (en)
FR (1) FR2361786A1 (en)
GB (1) GB1585843A (en)
IT (1) IT1109461B (en)
NL (1) NL7708726A (en)
SE (1) SE7708953L (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2353631A (en) * 1941-10-02 1944-07-18 Rca Corp Image reproducing apparatus
FR2232891A1 (en) * 1973-06-08 1975-01-03 Hasler Ag

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2353631A (en) * 1941-10-02 1944-07-18 Rca Corp Image reproducing apparatus
FR2232891A1 (en) * 1973-06-08 1975-01-03 Hasler Ag

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
EXBK/76 *
EXBK/77 *

Also Published As

Publication number Publication date
JPS5337313A (en) 1978-04-06
IT1109461B (en) 1985-12-16
GB1585843A (en) 1981-03-11
NL7708726A (en) 1978-11-01
AU511668B2 (en) 1980-08-28
FR2361786B1 (en) 1984-09-21
SE7708953L (en) 1978-02-11
AU2769777A (en) 1979-02-15

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Legal Events

Date Code Title Description
ST Notification of lapse