GB907978A - Apparatus and method for the compression of color images - Google Patents

Apparatus and method for the compression of color images

Info

Publication number
GB907978A
GB907978A GB710761A GB710761A GB907978A GB 907978 A GB907978 A GB 907978A GB 710761 A GB710761 A GB 710761A GB 710761 A GB710761 A GB 710761A GB 907978 A GB907978 A GB 907978A
Authority
GB
Grant status
Application
Patent type
Prior art keywords
original
signals
derived
colour
luminance
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
GB710761A
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.)
Fairchild Semiconductor Corp
Original Assignee
Fairchild Semiconductor Corp
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

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46Colour picture communication systems
    • H04N1/56Processing of colour picture signals
    • H04N1/60Colour correction or control
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46Colour picture communication systems
    • H04N1/56Processing of colour picture signals
    • H04N1/60Colour correction or control
    • H04N1/6027Correction or control of colour gradation or colour contrast

Abstract

907,978. Television. FAIRCHILD CAMERA & INSTRUMENT CORPORATION. Feb. 27, 1961 [March 1, 1960], No. 7107/61. Drawings to Specification. Class 40 (3). [Also in Group XL (c)] In an arrangement in which a coloured original (film transparency, photographic print &c.) is scanned photo-electrically to produce signals representative of the component colours thereof the range of both the luminance and the colour saturation of each point of the original is compressed (or expanded) without affecting the dominant wavelengths of the latter so that satisfactory reproduction by a different medium e.g. letterpress, gravure, lithographic printing &c. having ranges of luminance and saturation different from the original may be effected. The Specification gives a mathematical analysis of the problem and shows that the desired modification (" compression," in the described embodiments) may be effected by adding to each original colour component signal a colour saturation correction signal dependent on the instantaneous maximum and minimum values of the original signals and by multiplying each original colour component signal by a luminance correction signal also dependent on the instantaneous maximum and minimum values of the original signals. In one embodiment (Fig. 1, not shown), the correction signals are derived by computer means and caused to operate on the original signals at a point in the circuit subsequent to that at which they are derived. In a second, preferred, embodiment (Fig. 2, not shown), each colour component channel utilizes a photo-multiplier tube to the output of which the colour saturation correction signals, derived from a subsequent point in the circuit, are added the luminance correction signals, derived from the same point, being employed as modulation signals for the voltage supply to the dynodes of the multiplier. Specifications 692,349 and 692,400 and U.S.A. Specification 2,843,664 are referred to.
GB710761A 1960-03-01 1961-02-27 Apparatus and method for the compression of color images Expired GB907978A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US3144510A US3144510A (en) 1960-03-01 1960-03-01 Apparatus for the compression of color images

Publications (1)

Publication Number Publication Date
GB907978A true true GB907978A (en) 1962-10-10

Family

ID=21753338

Family Applications (1)

Application Number Title Priority Date Filing Date
GB710761A Expired GB907978A (en) 1960-03-01 1961-02-27 Apparatus and method for the compression of color images

Country Status (2)

Country Link
US (1) US3144510A (en)
GB (1) GB907978A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3196393A (en) * 1961-02-09 1965-07-20 Ohio Commw Eng Co Input device for data processing system
US3283067A (en) * 1964-04-03 1966-11-01 Rca Corp Signal processing apparatus for color systems utilizing separate luminance signal pickup
US3622690A (en) * 1968-09-26 1971-11-23 Rca Corp Electronic scanner utilizing a laser for the simultaneous scanning and reproducing of images
GB1294351A (en) * 1969-05-23 1972-10-25 Crosfield Electronics Ltd Improvements relating to colour printing apparatus
US4533928A (en) * 1982-04-30 1985-08-06 Canon Kabushiki Kaisha Color image processing apparatus
US4758885A (en) * 1985-06-17 1988-07-19 Canon Kabushiki Kaisha Method of processing color image
JPH0588589B2 (en) * 1985-06-17 1993-12-22 Canon Kk
JP3600372B2 (en) * 1995-06-27 2004-12-15 株式会社リコー Color gamut correction apparatus and method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE530710A (en) * 1953-07-30
US2981792A (en) * 1957-10-31 1961-04-25 Fairchild Camera Instr Co Color correction computer for engraving machines
NL256633A (en) * 1959-10-09

Also Published As

Publication number Publication date Type
US3144510A (en) 1964-08-11 grant

Similar Documents

Publication Publication Date Title
US4037249A (en) Reproduction of colored images
US5212546A (en) Color correction system employing reference pictures
US5557340A (en) Noise reduction in video signals
US4410908A (en) Luminance signal generator for color film scanner
US4500919A (en) Color reproduction system
US5293258A (en) Automatic correction for color printing
US3558806A (en) Matrixing apparatus
US3684825A (en) Contrast compression circuits
US2757571A (en) Photographic color printer
US3674364A (en) Method and apparatus for evaluating color transparencies and the like
US3128333A (en) Electronic previewer for color printing processes
US2627547A (en) Gamma control
US4240103A (en) Method for the additive and multiplicative spurious signal compensation
JPS60220660A (en) Color correcting method
US3752905A (en) Gamma control in the luminance channel of a color television transmitter
JPS59163971A (en) Color picture recording device
JPS5911062A (en) Image input and output system
US5572607A (en) Method and circuit arrangement for electronic retouching of images
US2606245A (en) Unsharp mask in electronic color correction
US3115807A (en) Electronic masking
US2710889A (en) Color reproduction
US3196205A (en) Color television camera system
US5764796A (en) Image processing apparatus for and a method of preparing data representing a colour image
US3995105A (en) Apparatus for automatic measurement of the video-signal-to-noise ratio in a television channel
US3450830A (en) Photographic reproduction employing both sharp and unsharp masking