DE102005045036A1 - Multi-spectral camera e.g. satellite camera, for e.g. microscope, has image processing unit that normalizes intensity of image signals in detected spectral area corresponding to channel according to specific mathematical relationship - Google Patents
Multi-spectral camera e.g. satellite camera, for e.g. microscope, has image processing unit that normalizes intensity of image signals in detected spectral area corresponding to channel according to specific mathematical relationship Download PDFInfo
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- DE102005045036A1 DE102005045036A1 DE102005045036A DE102005045036A DE102005045036A1 DE 102005045036 A1 DE102005045036 A1 DE 102005045036A1 DE 102005045036 A DE102005045036 A DE 102005045036A DE 102005045036 A DE102005045036 A DE 102005045036A DE 102005045036 A1 DE102005045036 A1 DE 102005045036A1
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- image signal
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- camera
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- 230000003595 spectral effect Effects 0.000 title claims abstract description 62
- 238000001514 detection method Methods 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 11
- 230000035945 sensitivity Effects 0.000 claims description 11
- 238000003384 imaging method Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000012952 Resampling Methods 0.000 description 2
- 241001464837 Viridiplantae Species 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 206010034972 Photosensitivity reaction Diseases 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 229930002875 chlorophyll Natural products 0.000 description 1
- 235000019804 chlorophyll Nutrition 0.000 description 1
- ATNHDLDRLWWWCB-AENOIHSZSA-M chlorophyll a Chemical compound C1([C@@H](C(=O)OC)C(=O)C2=C3C)=C2N2C3=CC(C(CC)=C3C)=[N+]4C3=CC3=C(C=C)C(C)=C5N3[Mg-2]42[N+]2=C1[C@@H](CCC(=O)OC\C=C(/C)CCC[C@H](C)CCC[C@H](C)CCCC(C)C)[C@H](C)C2=C5 ATNHDLDRLWWWCB-AENOIHSZSA-M 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000036211 photosensitivity Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C11/00—Photogrammetry or videogrammetry, e.g. stereogrammetry; Photographic surveying
- G01C11/02—Picture taking arrangements specially adapted for photogrammetry or photographic surveying, e.g. controlling overlapping of pictures
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/10—Circuitry of solid-state image sensors [SSIS]; Control thereof for transforming different wavelengths into image signals
- H04N25/11—Arrangement of colour filter arrays [CFA]; Filter mosaics
- H04N25/13—Arrangement of colour filter arrays [CFA]; Filter mosaics characterised by the spectral characteristics of the filter elements
- H04N25/134—Arrangement of colour filter arrays [CFA]; Filter mosaics characterised by the spectral characteristics of the filter elements based on three different wavelength filter elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2803—Investigating the spectrum using photoelectric array detector
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/30—Measuring the intensity of spectral lines directly on the spectrum itself
- G01J3/36—Investigating two or more bands of a spectrum by separate detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
- G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/10—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from different wavelengths
- H04N23/11—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from different wavelengths for generating image signals from visible and infrared light wavelengths
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/10—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from different wavelengths
- H04N23/13—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from different wavelengths with multiple sensors
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/80—Camera processing pipelines; Components thereof
- H04N23/84—Camera processing pipelines; Components thereof for processing colour signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/10—Circuitry of solid-state image sensors [SSIS]; Control thereof for transforming different wavelengths into image signals
- H04N25/11—Arrangement of colour filter arrays [CFA]; Filter mosaics
- H04N25/13—Arrangement of colour filter arrays [CFA]; Filter mosaics characterised by the spectral characteristics of the filter elements
- H04N25/131—Arrangement of colour filter arrays [CFA]; Filter mosaics characterised by the spectral characteristics of the filter elements including elements passing infrared wavelengths
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Color Television Image Signal Generators (AREA)
Abstract
Description
Die Erfindung betrifft eine Multispektralkamera nach dem Oberbegriff des Anspruchs 1 und ein Verfahren zum Erzeugen von Bildinformation nach dem Oberbegriff des Anspruchs 8.The The invention relates to a multispectral camera according to the preamble of claim 1 and a method for generating image information according to the preamble of claim 8.
Eine Multispektralkamera der eingangs genannten Art, in der das Verarbeiten von Bildinformation mit einem Verfahren der eingangs genannten Art erfolgt, wird als Kamera DMC von der Firma ZI Imaging GmbH angeboten. Diese Kamera ist für Luftbildaufnahmen ausgelegt. In dieser Kamera wird ein hochaufgelöstes panchromatisches Bild eines Objektbereichs generiert, welches von einem CCD-Sensor im Spektralbereich von 350–900 nm aufgenommen wird und auf ca. 101 Mio. Pixeln basiert. Darüber hinaus werden Farbauszüge mittels vier weiterer CCD-Kameraeinheiten mit einer geringeren Auflösung von jeweils 6 Mio. Pixeln aufgenommen. Diese CCD-Kameraeinheiten sind mit Farbfiltern für die Bereiche Rot, Grün, Blau und Infrarot bestückt. Die Kamera hat damit einen hochaufgelösten panchromatischen Bildkanal und 4 niedrig aufgelöste schmalbandige Bildkanäle.A Multispectral camera of the type mentioned in the processing image information is taken with a method of the type mentioned, is offered as camera DMC by ZI Imaging GmbH. These Camera is for Aerial photography designed. In this camera is a high-resolution panchromatic Image of an object area generated by a CCD sensor in the spectral range of 350-900 nm and based on approximately 101 million pixels. Furthermore become color separations by means of four further CCD camera units with a lower resolution of each 6 million pixels recorded. These CCD camera units are equipped with color filters for the Areas Red, Green, Blue and infrared equipped. The camera thus has a high-resolution panchromatic image channel and 4 low-resolution narrowband image channels.
Die Farbauszüge der Multispektralkamera werden jeweils getrennt für die Kanäle „Rot", „Grün", „Blau" (RGB) für den Fall einer Farbdarstellung und die Kanäle „Infrarot", „Rot" und „Grün" (IRG) im Falle einer Falschfarbentastung bestimmt. Hierzu werden die Farbauszüge zunächst in einem niedrig aufgelösten Kanal berechnet und als Farbvektor mit einem bestimmten Helligkeitswert h und zwei Farbkomponenten u, v dargestellt. Mit diesem Farbvektor erfolgt dann ein „Resampling" in die höhere Auflösung des panchromatischen Kanals. Darauf wird Helligkeitsinformation des räumlich niedrig aufgelösten Multispektralraums durch die hochaufgelösten Werte des panchromatischen Kanals ersetzt. Hierdurch ergibt sich ein hochaufgelöstes Farbbild.The color separations The multispectral camera are each separated for the channels "Red", "Green", "Blue" (RGB) for the case a color representation and the channels "infrared", "red" and "green" (IRG) in the case of False-color keying determined. For this, the color separations are first in a low resolution Channel calculated and as a color vector with a specific brightness value h and two color components u, v are shown. With this color vector then "resampling" takes place in the higher resolution of the panchromatic Channel. On it is brightness information of spatially low-resolution multispectral space through the high-resolution Values of the panchromatic channel replaced. This results a high resolution Color.
Dieses Verfahren wird auch für die Auswertung der Bildinformation von Satellitenkameras eingesetzt, die mehrere Multispektralkanäle haben können.This Procedure is also for used the evaluation of image information from satellite cameras, the multiple multispectral channels can have.
Bei einer solchen konventionellen Multispektralkamera besteht das Problem, dass beispielsweise Vegetationsszenen mit einem hohen Anteil an Grünpflanzen nur mit geringem Farbkontrast abgebildet werden. Der hohe Anteil von Chlorophyll in den Blättern von Grünpflanzen führt dazu, dass diese normales Sonnenlicht im grünen Spektralbereich vergleichsweise gering reflektieren, dagegen Licht im infraroten Spektralbereich mit einer Wellenlänge oberhalb von 750 nm um den Faktor 3 bis 10 stärker reflektieren. Verfügt bei entsprechenden Kameras der hochauflösende panchromatische Kanal über eine in das Infrarote ausgedehnte spektrale Empfindlichkeit, werden, wenn keine geeignete Bearbeitung der auf den Farbkanälen anliegenden Bildinformation erfolgt, die Vegetationszonen überbetont hell dargestellt. Die Folge ist, dass das erfasste Bild nur einen schlechten Kontrast hat. Zur Vermeidung dieses Problems ist es bekannt, den panchromatischen Kanal mit einem IR-Sperrfilter zu blockieren. Diese Maßnahme führt jedoch zu einem Verlust an räumlicher Auflösung von mit der Multispektralkamera erfasster Bildinformation.at such a conventional multispectral camera has the problem that, for example, vegetation scenes with a high proportion of green plants can only be imaged with low color contrast. The high share of chlorophyll in the leaves of green plants leads to, that this normal sunlight in the green spectral range comparatively low reflectance, while light in the infrared spectral range with one wavelength reflect more strongly by a factor of 3 to 10 above 750 nm. Has appropriate Cameras the high-resolution panchromatic channel over a spectral sensitivity extended to the infrared, if no suitable processing of the voltage applied to the color channels Image information takes place, the vegetation zones over-emphasized brightly represented. The result is that the captured image is only a poor contrast Has. To avoid this problem it is known the panchromatic Channel with an IR cut filter to block. This measure, however, leads to a loss of spatial resolution of image information acquired with the multi-spectral camera.
Aufgabe der Erfindung ist es, eine Multispektralkamera und ein Verfahren zum Erzeugen von Bildinformation bereitzustellen, welche bei geringer Signalintensität in Bildkanälen mit schmalbandigem Spektralbereich und bei hoher Signalintensität in einem Bildkanal mit panchromatischem Spektralbereich eine hochaufgelöste Bilddarstellung mit gutem Kontrast ermöglicht.task The invention is a multi-spectral camera and a method for providing image information which at low signal intensity in image channels narrowband spectral range and high signal intensity in one Image channel with panchromatic spectral range a high-resolution image representation with good contrast.
Diese Aufgabe wird durch eine Multispektralkamera mit den Merkmalen des Anspruchs 1 und ein Verfahren zum Erzeugen von Bildinformation mit den Merkmalen des Anspruchs 8 gelöst. Hierbei können eine, zwei oder mehr Bilderfassungseinheiten zur Erfassung eines Bildsignals in zwei, drei oder mehr verschiedenen schmalbandigen Spektralbereichen vorgesehen sein, etwa dem roten, grünen, blauen und infraroten Spektralbereich. Weiter wird das Signal einer Bilderfassungseinheit zur Erfassung von Bildinformation mit hoher räumlicher Auflösung und einer Empfindlichkeit in einem breitbandigen Spektralbereich ausgewertet, der die schmalbandigen Spektralbereiche des oder der anderen Bildsignalerfassungseinheiten abdeckt. Indem ein schmalbandiger Spektralbereich wenigstens teilweise mit dem infraroten Spektralbereich überlappt, ist es möglich, Bildinformationen, deren Licht im nicht sichtbaren Spektralbereich liegt, mit gutem Kontrast sichtbar zu machen.These Task is performed by a multispectral camera with the characteristics of Claim 1 and a method for generating image information with the features of claim 8 solved. Here, one, two or more image capture units for capturing an image signal in two, three or more different narrowband spectral ranges be provided, such as the red, green, blue and infrared Spectral range. Next, the signal of an image acquisition unit for capturing image information with high spatial resolution and evaluated sensitivity in a broadband spectral range, the narrowband spectral regions of the one or more other image signal detection units covers. By a narrowband spectral range at least partially overlapping with the infrared spectral range, it is possible to whose light is in the non-visible spectral range, with good Visualize contrast.
Eine solche Multispektralkamera kann beispielsweise in ein Mikroskop, ein Operationsmikroskop oder ein Luftbildaufnahmegerät integriert werden.A such a multispectral camera can be placed in a microscope, for example, a surgical microscope or an aerial image recording device integrated become.
Vorteilhafte Ausführungsform der Erfindung sind in den Unteransprüchen angegeben und werden anhand der Zeichnungen nachfolgend beschrieben.advantageous embodiment The invention are set forth in the subclaims and are based on the drawings described below.
Es zeigen:It demonstrate:
Das
Mikroskop
Die
erste Bildsignalerfassungseinheit
Den
Bildsignalerfassungseinheiten
Die
erste Bildsignalerfassungseinheit
Die
Anhand
von
Die
relative spektrale Empfindlichkeit des Detektorpixels
Die
Bildsignalverarbeitungseinheit
Die
Bildsignalverarbeitungseinheit
Dies
bewirkt, dass der Farbbeitrag des i-ten schmalbandigen Farbkanals
der Bildsignalerfassungseinheit
Damit
wird gewährleistet,
dass sofern ein von Null verschiedenes Signal mit geringer Intensität auf einem
schmalbandigen Farbkanal anliegt, dieses auf der Bilddarstellungseinheit
Die
Claims (10)
Priority Applications (1)
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DE102005045036A DE102005045036A1 (en) | 2005-09-21 | 2005-09-21 | Multi-spectral camera e.g. satellite camera, for e.g. microscope, has image processing unit that normalizes intensity of image signals in detected spectral area corresponding to channel according to specific mathematical relationship |
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DE102005045036A DE102005045036A1 (en) | 2005-09-21 | 2005-09-21 | Multi-spectral camera e.g. satellite camera, for e.g. microscope, has image processing unit that normalizes intensity of image signals in detected spectral area corresponding to channel according to specific mathematical relationship |
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DE102005045036A1 true DE102005045036A1 (en) | 2007-03-22 |
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DE102005045036A Withdrawn DE102005045036A1 (en) | 2005-09-21 | 2005-09-21 | Multi-spectral camera e.g. satellite camera, for e.g. microscope, has image processing unit that normalizes intensity of image signals in detected spectral area corresponding to channel according to specific mathematical relationship |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010041569A1 (en) | 2010-09-28 | 2012-03-29 | Z/I Imaging Ltd. | Digital camera system, with at least two independent digital cameras |
CN107843341A (en) * | 2017-11-16 | 2018-03-27 | 中国科学院西安光学精密机械研究所 | Space-based space target high-resolution multispectral imaging method and system |
-
2005
- 2005-09-21 DE DE102005045036A patent/DE102005045036A1/en not_active Withdrawn
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010041569A1 (en) | 2010-09-28 | 2012-03-29 | Z/I Imaging Ltd. | Digital camera system, with at least two independent digital cameras |
WO2012041553A1 (en) | 2010-09-28 | 2012-04-05 | Leica Geosystems Ag | Digital multi-spectral camera system having at least two independent digital cameras |
CN103201602A (en) * | 2010-09-28 | 2013-07-10 | 莱卡地球系统公开股份有限公司 | Digital multispectral camera system with at least two independent digital cameras |
US8786741B2 (en) | 2010-09-28 | 2014-07-22 | Leica Geosystems Ag | Digital multi-spectral camera system having at least two independent digital cameras |
CN103201602B (en) * | 2010-09-28 | 2015-04-29 | 莱卡地球系统公开股份有限公司 | Digital multispectral camera system with at least two independent digital cameras |
DE102010041569B4 (en) * | 2010-09-28 | 2017-04-06 | Leica Geosystems Ag | Digital camera system, color filter element for digital camera system, method for determining deviations between the cameras of a digital camera system and image processing unit for digital camera system |
CN107843341A (en) * | 2017-11-16 | 2018-03-27 | 中国科学院西安光学精密机械研究所 | Space-based space target high-resolution multispectral imaging method and system |
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