GB1285067A - Improvements in or relating to the reproduction of a picture - Google Patents

Improvements in or relating to the reproduction of a picture

Info

Publication number
GB1285067A
GB1285067A GB47603/69A GB4760369A GB1285067A GB 1285067 A GB1285067 A GB 1285067A GB 47603/69 A GB47603/69 A GB 47603/69A GB 4760369 A GB4760369 A GB 4760369A GB 1285067 A GB1285067 A GB 1285067A
Authority
GB
United Kingdom
Prior art keywords
reproduction
quantized
waveform
sept
resultant
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.)
Expired
Application number
GB47603/69A
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.)
Individual
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Publication of GB1285067A publication Critical patent/GB1285067A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/90—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using coding techniques not provided for in groups H04N19/10-H04N19/85, e.g. fractals
    • 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

Abstract

1285067 Facsimile DR-ING RUDOLF HELL 26 Sept 1969 [26 Sept 1968] 47603/69 Heading H4F In a facsimile reproduction system, a triangular waveform 15 is added to the continuously varying video signal 14, and the resultant waveform is amplitude quantized to the middle of a range 10/11, 11/12, 12/13 according to the range its amplitude occurs in at samples taken at time quanta tx. The resultant quantized waveform comprises a series of pulses having durations equal to multiples of tx. By arranging that the frequency of the triangular waveform is not harmonically related to the sampling frequency 1/tx, the half-tone type dots, on a background of quantized intensity, as obtained in the reproduction, are randomly distributed and do not produce moire patterns, yet enable the reproduction of various intensities of tone.
GB47603/69A 1968-09-26 1969-09-26 Improvements in or relating to the reproduction of a picture Expired GB1285067A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681797412 DE1797412B2 (en) 1968-09-26 1968-09-26 METHOD OF RECORDING THE OBTAINED, QUANTIZED AND IF NECESSARY BY SCANNING OF HALFTONE ARTICLES TO BE REPRODUCED DIGITALIZED PICTURE SIGNALS

Publications (1)

Publication Number Publication Date
GB1285067A true GB1285067A (en) 1972-08-09

Family

ID=5708632

Family Applications (1)

Application Number Title Priority Date Filing Date
GB47603/69A Expired GB1285067A (en) 1968-09-26 1969-09-26 Improvements in or relating to the reproduction of a picture

Country Status (3)

Country Link
DE (1) DE1797412B2 (en)
GB (1) GB1285067A (en)
NL (1) NL6914502A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4926246A (en) * 1988-06-08 1990-05-15 Crosfield Electronics Limited Dither processing circuit
US5828815A (en) * 1993-07-12 1998-10-27 Agfa-Gevaert High quality multilevel halftoning for color images with reduced memory requirements

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8722228D0 (en) * 1987-09-22 1987-10-28 Crosfield Electronics Ltd Image processing
BE1007264A4 (en) * 1993-07-12 1995-05-02 Agfa Gevaert Nv Grid method for writing system with reduced density resolution.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4926246A (en) * 1988-06-08 1990-05-15 Crosfield Electronics Limited Dither processing circuit
US5828815A (en) * 1993-07-12 1998-10-27 Agfa-Gevaert High quality multilevel halftoning for color images with reduced memory requirements

Also Published As

Publication number Publication date
NL6914502A (en) 1970-04-01
DE1797412B2 (en) 1972-05-04
DE1797412A1 (en) 1970-12-23

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee