Broschüre Multispektral_FAQ

Multispectral Imaging System Frequently Asked Questions Multispectral by book2net

Multispectral by book2net From a technical vision to an innovative solution Introduction Compared to conventional methods, the new process worldwide offers the following advantages: • Significantly reduced processing times • There is no need for filter change. Thus, the system works completely vibration-free • No post-correction of sharpness and focus required in the spectral regions • Systematic standardization of the scanning, light and imaging processes • Storable profiles for continuous shooting in defined spectral bands allow comparability and repeatability • Pixel-precise, true to scale imaging within the different spectral bands • A true colour capturing result can be created from the original using the same camera and illumination system. Hence, additional information will be available when analysing the spectral images. X1 Spectral Camera The proposed solution is equipped with a full frame colour camera with a resolution of 150 megapixel. The delivery includes an especially adapted lens that is suitable for capturing originals for the defined field of view of 30cm x 40cm and an approximate focussing distance of 90cm. A customisation of the included lens to a field of view and the focussing distance other than stated in the answers for the clarification questions is possible on the base of requirement specification given by the National Archives. Please can you specify what you see as the benefits of using a colour sensor over monochrome? Only the use of this specific colour sensor that comes along with the offered solution allows the direct access to the native, unprocessed information in analogue form for each pixel. Therefor, the used colour sensor is providing a considerably greater amount of information for the different spectral bands than a monochrome sensor. In difference to the use of a monochrome sensor that relies on filters, our colour sensor allows to separate the native information for the spectral ranges into colour channels and to generate optionally • a true-colour image (RGB) • a greyscale image • the individual grey images of the colour channels • the grey image (for each of the RGB channels) and a false colour image (UV, VIS, IR). The specific colour sensor with access to the native information allows a particulary speedy and reproduceable creation of images in different spectral ranges without the need to use filters.

Why don‘t you use filters / filter wheels? The use of filters and filter changes are associated with the risk of vibration and the resulting scale changes of up to 3-5 pixels, which make subsequent analysis by means of pixel-precise overlay technology more difficult. Thanks to the newly developed method of applying software filters as described in the answer to requirement 3.1.2. there is no need for filter change with the new X150 Multispectral System. The included MSP Filter Imager implements the control of the applied software filters in accordan- ce to the selected spectral range/s. Optionally, a colour image (RGB), a grayscale image, the indivi- dual grey images of the colour image channels or the grey image (for each of the RGB channels) or a false colour image (UV, VIS, IR) can be generated. The intelligent software filter for multispectral analysis is replacing mechanical lens filters and ensures a vibration-free capture is ensured.sensor (please see point 4.5, page 10). Using our software filter, only the values of the desired spectral ran- geare analysed and combined into one image. What is the make of the lens, and is it parfocal? • The lens has been selected to meet the requirements of the field of view specified by The National Archives. • The system comes along with an industrial Schneider Kreuznach enlargement lens with a fixed focal length (no consumer zoom lens!) • The lens is especially adapted to the multispectral sensor of the X150 Multispectral Imaging System. • The Schneider-Kreuznach lens allows for a distortion-free capture of the entire field of view which is a mandatory pre-condition to enable a pixel accurate overlay for analysis. • Thanks to a depth of field of 8cm for multispectral overlay there is no readjustment of the focus required. Thus, a true-to-scale, pixel accurate capture in the different spectral ranges is ensured. Why don‘t you use narrowband illumination? X150 Multispectral System is equipped with 2 broadband LED illumination units with 3 broadband LED illumination lines each (UV, VIS, IR), which allow a more homogeneous illumination of larger formats up to A0 in size (please see point 4.2, page 9). Other than common systems the definition of the spectral ranges is not carried out by the selection of the spectral bands of the illumination. With the newly developed method the pixel values of the sensor are evaluated on an analogue basis as pure native voltage values from the colour sensor (please see point 4.5, page 10). Using our software filter, only the values of the desired spectral range are analysed and combined into one image. Can the system be used as a spectrophotometer? The offered multispectral imaging solution is even more than a spectrometer as it even allows for materials analysis: • The X150 Multispectral imaging system is a true-colour calibrated system providing 48bit colour information. Thus, it allows for the use of reference targets for all spectral ranges. • The especially designed targets for the distinction of materials can be captured with the original and offer the ability to distinguish different white materials such as lead white, lithopone, zinc white, titanium white, gypsum, lime, rubber, bister, iron gall and sepia, as well as pen types such as graphite, lead pencils etc.

Imaging Software Multispectral Camera 71 Megapixel Multispectral Camera 150 Megapixel Multispectral Camera * Klassik Stiftung Weimar - Graphic Art Collections Hohe Strasse 4-6, www.book2net.net 61231 Bad Nauheim [email protected] +49 (0) 6032 34 02 0