DE4431472A1 - Procedure to get information about colours of pictures in digital CCD-sensor photography - Google Patents

Procedure to get information about colours of pictures in digital CCD-sensor photography

Info

Publication number
DE4431472A1
DE4431472A1 DE19944431472 DE4431472A DE4431472A1 DE 4431472 A1 DE4431472 A1 DE 4431472A1 DE 19944431472 DE19944431472 DE 19944431472 DE 4431472 A DE4431472 A DE 4431472A DE 4431472 A1 DE4431472 A1 DE 4431472A1
Authority
DE
Germany
Prior art keywords
color
sensor
information
exposure
color filter
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
DE19944431472
Other languages
German (de)
Other versions
DE4431472C2 (en
Inventor
Roland Krueger
Erich Miedlig
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.)
Rollei Fototechnic GmbH
Original Assignee
Rollei Fototechnic GmbH
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 Rollei Fototechnic GmbH filed Critical Rollei Fototechnic GmbH
Priority to DE19944431472 priority Critical patent/DE4431472C2/en
Publication of DE4431472A1 publication Critical patent/DE4431472A1/en
Application granted granted Critical
Publication of DE4431472C2 publication Critical patent/DE4431472C2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • H04N1/46—Colour picture communication systems
    • H04N1/56—Processing of colour picture signals
    • H04N1/60—Colour correction or control
    • H04N1/6083—Colour correction or control controlled by factors external to the apparatus
    • H04N1/6086—Colour correction or control controlled by factors external to the apparatus by scene illuminant, i.e. conditions at the time of picture capture, e.g. flash, optical filter used, evening, cloud, daylight, artificial lighting, white point measurement, colour temperature

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Color Television Image Signal Generators (AREA)

Abstract

The procedure uses three consecutive colour exposures of the object to be photographed. With each exposure, a colour filter of different light sensitivity is used and a sensor is placed in front of the colour filter to measure the amount of light independent of the colour filter. This parameter is used to calculate a correction factor before selecting a CCD field sensor.

Description

Die Erfindung betrifft ein Verfahren zur Erlangung von Infor­ mationen über die Farbe eines Bildes in der einen hoch auflö­ senden CCD-Flächensensor verwendenden digitalen Fotografie, wobei die Farben durch drei nacheinander erfolgende Belich­ tungen erzeugt werden, bei denen das vom aufzunehmenden Ob­ jekt kommende Licht durch drei nacheinander in den Strahlen­ gang gefahrene Farbfilter in drei Farbenkanäle zerlegt wird, deren Komponenten einzeln ausgewertet werden.The invention relates to a method for obtaining information high resolution about the color of an image in one send digital photography using CCD area sensor, the colors by three successive exposures are generated in which the object to be recorded light coming through three successively in the rays color filters that are currently in use are broken down into three color channels, whose components are evaluated individually.

In der digitalen Fotografie kommen zunehmend hochauflösende CCD-Flächensensoren zum Einsatz, die eine Pixel-Anzahl < 1 Mio. aufweisen und im sichtbaren Licht spektral unter­ schiedlich empfindlich sind. Um Informationen über die Farbe des Bildes zu erhalten, wird das Licht in drei Farbenkanäle zerlegt, deren Komponenten einzeln ausgewertet werden.High-resolution is increasingly coming into digital photography CCD area sensors are used that measure a number of pixels <1 million and spectrally below in visible light are differently sensitive. To get information about the color To get the image, the light comes in three color channels disassembled, the components of which are evaluated individually.

Zur Aufnahme von sich bewegenden Objekten muß die Belichtung der drei Farbkanäle annähernd gleichzeitig erfolgen. Hierfür werden entweder drei Sensoren mit vorgeschaltetem Farbteiler oder aber CCD-Sensoren mit auf ihrer Oberfläche angeordneten Farbfiltern verwendet, bei denen die Farbinformationen räum­ lich nebeneinanderliegen.The exposure must be used to record moving objects of the three color channels take place approximately simultaneously. Therefor are either three sensors with an upstream color divider  or CCD sensors arranged on their surface Color filters are used in which the color information space lie side by side.

Bei höchstauflösenden Sensoren großer Fläche (< 30 mm × 30 mm) ist die Herstellung von Farbteilern sehr aufwendig und teuer. Durch die Anordnung der Farbfilter auf der Oberfläche dieser Sensoren wird die effektive Auflösung gedrittelt; die Farbtrennung ist durch die einsetzbaren Materialien be­ schränkt.With high resolution sensors of large area (<30 mm × 30 mm), the production of color dividers is very complex and expensive. By arranging the color filters on the surface the effective resolution of these sensors is divided into three; the Color separation is due to the materials that can be used limits.

Bei der Aufnahme von sich nicht bewegenden Objekten kann man - unter Umgehung der vorstehend genannten Nachteile - die drei Farbkanäle nacheinander aufnehmen, also drei Belichtun­ gen mit je einem anderen Farbfilter nacheinander durchführen. Diese Farbfilter können normale Glasfilter bester Qualität sein, die nacheinander in den Strahlengang gefahren werden.When shooting non-moving objects one - bypassing the disadvantages mentioned above - the Record three color channels in succession, i.e. three exposures with a different color filter. These color filters can be normal glass filters of the best quality be moved one after the other into the beam path.

Da die Farbfilter unterschiedliche Spektralempfindlichkeit und Durchlaßcharakteristik aufweisen, müssen zur Wiedergabe einer weißen Fläche die Signale gegeneinander gewichtet wer­ den. Hierzu wird von einer weißen Fläche eine Probebelichtung gemacht und danach die Parameter des Systems (z. B. elektri­ sche Verstärkung, Multiplikatoren in Rechnern) so einge­ stellt, daß bei einer Wiedergabe diese Fläche weiß erscheint (sogenannter Weißabgleich).Because the color filter has different spectral sensitivity and pass characteristics must be reproduced a white area the signals are weighted against each other the. For this purpose, a test exposure is made of a white surface made and then the parameters of the system (e.g. electrical cal gain, multipliers in computers) makes this area appear white during playback (so-called white balance).

Da die Farben durch drei nacheinanderfolgende Belichtungen erzeugt werden, geht auch die unterschiedliche Belichtungs­ zeit bzw. Intensität in den Weißabgleich ein. Da andererseits aber der Weißabgleich vorab gemacht werden muß, führen nach­ folgende Schwankungen der Belichtung während einer Aufnahme zu Farbverschiebungen, die sich erst dann korrigieren lassen, wenn das Ergebnis vorliegt.Because the colors through three successive exposures generated, the different exposure goes time or intensity in the white balance. On the other hand but the white balance must be made in advance, follow subsequent fluctuations in exposure during a shot to color shifts that can only be corrected when the result is available.

Der Erfindung liegt die Aufgabe zugrunde, das eingangs be­ schriebene Verfahren hinsichtlich der Erlangung einer schnel­ leren Bildinformation zu verbessern. The invention is based, to be the beginning written procedures regarding obtaining a quick improve image information.  

Diese Aufgabe wird gemäß der Erfindung dadurch gelöst, daß bei jeder Farbbelichtung unabhängig von dem eingestellten Farbfilter die Lichtmenge der Belichtung gemessen und mit diesem Parameter schon vor dem Auslesen des CCD-Flächensen­ sors ein Korrekturfaktor bestimmt wird.This object is achieved according to the invention in that with each color exposure regardless of the set Color filter measured the amount of light of the exposure and with this parameter before reading out the CCD area a correction factor is determined.

Dabei ist es zweckmäßig, wenn zur Lichtmengenmessung ein vor dem Farbfilter zu positionierender Sensor verwendet wird, der zum Beispiel eine Silizium-Fotodiode sein kann.It is useful if there is a light measurement before the color filter to be positioned is used for example a silicon photodiode.

Erfindungsgemäß läßt sich dadurch schon vor der Verarbeitung der Daten eine Information gewinnen, die die Bestimmung eines Korrekturfaktors erlaubt. Zum Weißabgleich müssen dann nur noch zusätzlich die im wesentlichen konstanten Parameter der Filterdämpfung und der spektralen Empfindlichkeit des Sensors im Zusammenhang mit der spektralen Verteilung der Lichtquelle berücksichtigt werden.According to the invention, this can be done even before processing the data gain information that determines the determination of a Correction factor allowed. Then only have to do the white balance additionally the essentially constant parameters of the Filter attenuation and the spectral sensitivity of the sensor in connection with the spectral distribution of the light source be taken into account.

Claims (2)

1. Verfahren zur Erlangung von Informationen über die Farbe eines Bildes in der einen hoch auflösenden CCD-Fächensen­ sor verwendenden digitalen Fotografie, wobei die Farben durch drei nacheinander erfolgende Belichtungen erzeugt werden, bei denen das vom aufzunehmenden Objekt kommende Licht durch drei nacheinander in den Strahlengang gefah­ rene Farbfilter in drei Farbenkanäle zerlegt wird, deren Komponenten einzeln ausgewertet werden, dadurch gekenn­ zeichnet, daß bei jeder Farbbelichtung unabhängig von dem eingestellten Farbfilter die Lichtmenge der Belichtung gemessen und mit diesem Parameter schon vor dem Auslesen des CCD-Flächensensors ein Korrekturfaktor bestimmt wird.1. A method for obtaining information about the color of an image in digital photography using a high-resolution CCD fan sensor, the colors being produced by three successive exposures in which the light coming from the object to be photographed by three successively in the beam path gefah ren color filter is broken down into three color channels, the components of which are evaluated individually, characterized in that the light quantity of the exposure is measured for each color exposure regardless of the color filter set and a correction factor is determined with this parameter before the CCD area sensor is read out. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß zur Lichtmengenmessung ein vor dem Farbfilter zu positio­ nierender Sensor verwendet wird.2. The method according to claim 1, characterized in that to measure the light quantity in front of the color filter sensor is used.
DE19944431472 1994-09-03 1994-09-03 Process for determining the color of an image Expired - Fee Related DE4431472C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19944431472 DE4431472C2 (en) 1994-09-03 1994-09-03 Process for determining the color of an image

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19944431472 DE4431472C2 (en) 1994-09-03 1994-09-03 Process for determining the color of an image

Publications (2)

Publication Number Publication Date
DE4431472A1 true DE4431472A1 (en) 1996-07-11
DE4431472C2 DE4431472C2 (en) 1998-04-09

Family

ID=6527380

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19944431472 Expired - Fee Related DE4431472C2 (en) 1994-09-03 1994-09-03 Process for determining the color of an image

Country Status (1)

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DE (1) DE4431472C2 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3515268A1 (en) * 1984-05-10 1985-11-14 Dainippon Screen Manufacturing Co., Ltd., Kyoto METHOD AND DEVICE FOR IMAGE SIGNAL CORRECTION
DE3432933C2 (en) * 1983-10-07 1988-03-24 Welch Allyn, Inc., Skaneateles Falls, N.Y., Us
US5251021A (en) * 1990-08-31 1993-10-05 Eastman Kodak Company Color sequential scanner incorporating a synchronized variable exposure shutter
EP0613291A1 (en) * 1993-02-24 1994-08-31 Nikon Corporation Image reading apparatus having improved shading correction and quantity of light ratio measurement

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3432933C2 (en) * 1983-10-07 1988-03-24 Welch Allyn, Inc., Skaneateles Falls, N.Y., Us
DE3515268A1 (en) * 1984-05-10 1985-11-14 Dainippon Screen Manufacturing Co., Ltd., Kyoto METHOD AND DEVICE FOR IMAGE SIGNAL CORRECTION
US5251021A (en) * 1990-08-31 1993-10-05 Eastman Kodak Company Color sequential scanner incorporating a synchronized variable exposure shutter
EP0613291A1 (en) * 1993-02-24 1994-08-31 Nikon Corporation Image reading apparatus having improved shading correction and quantity of light ratio measurement

Also Published As

Publication number Publication date
DE4431472C2 (en) 1998-04-09

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Legal Events

Date Code Title Description
OP8 Request for examination as to paragraph 44 patent law
D2 Grant after examination
8327 Change in the person/name/address of the patent owner

Owner name: ROLLEI FOTOTECHNIC GMBH, 38126 BRAUNSCHWEIG, DE

8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee