The Institute of Imaging & Computer Vision has its own multispectral laboratory for multispectral imaging, analysis and true-color rendering. The equipment ranges from simple color charts and various analysis software to complex measuring devices such as the spectroradiometer CS2000.
By sampling the visible electromagnetic spectrum, the multispectral camera enables significantly higher color recording quality than conventional RGB cameras. It is therefore used for reference color imaging.
1392 x 1040 pixels
Pixel size 4.65µm x 4.65µm
Multispectral imaging of seven color channels using spectral bandpass filters between 400nm-700nm (in 50nm step size)
Fully automatic filter wheel control
Digital interface 1394 IEEE
Lens thread: F-mount
The HS10 high-speed filter wheel allows the flexible setup of a multispectral camera with filter wheel technology. By means of a C-mount adapter on the camera side, any industrial cameras can be connected. The F-mount adapter on the lens side allows for the easy connection of F-mount lenses.
10 filter positions
Diameter of the filters: 32mm, or 25mm using an adapter
Camera thread: C-mount
Lens bayonet: F-mount
Change to adjacent positions: 30m
Monochrome camera uEye 2240
This monochrome camera is used, with the filter wheel among other things, to take multispectral images.
1/2″ CCD sensor (Sony ICX205)
1280 x 1024 pixels
Pixel size: 4.65µm x 4.65µm
IR-cutoff filter interchangeable with a glass filter
Digital interface: USB 2.0
Lens thread: C-mount
Optical bandpass filters, 50mm diameter
These optical bandpass filters are, in a slightly smaller version, also used in the multispectral cameras described above.
Central wavelengths: from 400 to 700nm with 50nm steps
Half-width: 40nm +/- 8nm
Spectroradiometer Konica-Minolta CS 2000
The spectroradiometer CS 2000 allows extremely precise spectral measurements with a resolution in the visible light range of 1nm.
Spectral bandwidth: 5 nm or less (half-value bandwidth)
Monochromator Oriel Cornerstone 130, 1/8m with lamp
The monochromator emits a narrowband light whose bandwidth and central wavelength can be precisely adjusted mechanically or by software. The incoming light (here from a 75W Xenon lamp) is mirrored and diffracted by one of the two gratings. The spectrally expanded light is then made available at the output of the monochromator.
Grating 1: 200-1600nm (1200 lines/mm)
Grating 2: 450-1600nm (1200 lines/mm)
Lamp: 75 W Xenon Ozone free, with built-in filter wheel to block higher order wavelengths
Micrometer driven slit assembly: variable width from 4µm to 3mm and variable height from 1 to 15mm
X-Rite EyeOne Pro Spectrophotometer
The EyeOne Pro spectrophotometer enables reflectance and emission measurement with an optical resolution of 10nm in the wavelength range of visible light. Ambient light can also be measured using a specific measuring head.
Wavelength range: 380 to 730nm
Wavelength resolution: 10nm
Physical measurement interval: 3.5nm
Measurement geometry: 45°/0° with a ring illumination optics
Light source: gas filled tungsten (type A)
Various X-Rite ColorChecker targets
The color charts are used to check and calibrate the color reproduction and to create ICC-profiles.
The ColorChecker White Balance allows for correct white balance of images.
The ColorChecker Classic contains 24 different color tones, including a six-level gray scale.
The 140 color patches of the ColorChecker Digital SG include the 24 color tones of the ColorChecker Classic, as well as 17 gray tones, 14 skin tones and many other color reference patches.
Optical Simulation Software Zemax (Zemax Development Corporation)
Optical systems can be modelled and analyzed using the Zemax software. The design of optical systems is also supported. It is, for example, possible to display the 3D layout of a system, its aberrations and its spot diagramm for various angles of incidence and wavelengths.
Calibration software Eye-One Match 3 (X-Rite)
The Eye-One Match Software allows a user-friendly creation of ICC-profiles to calibrate
RGB- and CMYK-printers
The measuring device used with this software is the X-Rite EyeOne Pro.
Professional profile creation software Profile Maker 5 Platinum (X-Rite)
With Profile Maker 5 Platinum, ICC-profiles of
Printers (RGB, CMYK, multicolor CMYK + n colors)
can be professionally created, edited, optimized and tuned. The X-Rite EyeOne Pro spectrophotometer is also used with this software.
The softproof workstation enables a direct visual comparison between a model and its image displayed on a monitor. The monitor is shielded by a box so that no extraneous light interferes with the comparison. The softproof workstation was developed and manufactured by the Color and Image Processing Research Group.
Monitor: LCD screen with a 1680 x 1050 pixel resolution
Lamp types: D50, D65
CTF measuring station
The CTF measuring station allows the measurement of both the Camera Transfer Function (CTF) and the Opto-Electronic Conversion Function (OECF), which describes the relation between the irradiance on the sensor of a camera and the digital output value. The CTF enables a linearization of the measured values coming from the camera. The camera is illuminated by an integrating sphere and can be moved automatically on a sliding carriage, which changes the irradiance impinging on the sensor. The position of the camera is measured exactly by a position sensor with a resolution of 50µm.
Measuring resolution of the sliding carriage: 50µm
Measuring range of the sliding carriage: up to 5000mm
Illumination: integrating sphere (500mm) with halogen lamp (100 W)
English translation below.
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