Presentation on theme: "SCANNER IR The IR SCANNER is an infrared reflectographer. The infrared reflectography is an optical technique successfully used in the analisys of old."— Presentation transcript:
SCANNER IR The IR SCANNER is an infrared reflectographer. The infrared reflectography is an optical technique successfully used in the analisys of old paintings (on wood, canvas or wall, fresco excluded). The IR Reflectography allows to display artist’s scketches behind the paint layer. By this technique is also allowed to disclose presence of hidden layings previous to the final one. PRODUCT FAMILIES PRODUCT FAMILIES
SCANNER IR WHAT IS THE IR REFLECTOGRAPHY u It is an optical technique to analyse paintings. It works in the so called Near InfraRed wavelengths (N.I.R.), that’s between around 0.8 m and 2.5 m. u Its major use is the detection of details hidden underneath layings, among which there is the underdrawing.
SCANNER IR A COMPARISON BETWEEN TECHNOLOGIES CCD NIR camera, working from visible to 1.1 m u good resolution, but unsuitable to see underneath many type of pigments VIDICON camera (PbS), working from visible to 2.2 m u both resolution and contrast rather scarce u good behaviour with the majority of pigments SCANNER IR, working from 0.9 m to 1.7 m u insuperable resolution u very high contrast u excellent visibility underneath any kind of pigments
SCANNER IR The IR SCANNER combines to the good visibility achieved by a Vidicon tube an excellent contrast, a more extended tone range and a very high spatial resolution, as it is briefly reported below. u Spatial Resolution: 4 pixel/mm (16 pixel/mm 2 ), equal to 101.6 dpi u Tone Range: 4096 levels of gray u Working Wavelength: 900 ÷ 1700 nm u Acquisition Area: 1 m 2 u Dimensions of digital image: 4000 * 4000 pixel BASIC FEATURES
OTHER IMPORTANT FEATURES u Vertical Scan Speed ~ 0.2 m/s (this data immediately informs about the total time of acquisition: for example 6 hours for 1 m 2 area) u Distance between optical head and painting: ~ 150 mm u Image Format: RAW 16 bit (for reflectograms relevant to 1 m 2 area, the image dimension is ~ 32 MB) u Increment of vertical stroke by a rigid module on Y axis, to scan areas as tall as 2 m, by simply moving initial position of the optical head u Use of a standard notebook as PC ; SCANNER IR
It is an element made of three detectors working at the wavelengths of the Red, the Green, the Blue. It allows acquisition of three images in the visible, which will be then processed by a dedicated graphic software which will make up one colour image. The Optical Head, equipped with the RGB Module, therefore acquires both the IR reflectogram and the colour image. Since these two images are perfectly aligned and have same spatial resolution, they are perfectly superposable. This is absolutely impossible with traditional colour images, because of their optical distortion and of scarce optical resolution, comparing to an IR reflectogram. The dimension of an RGB image, stored in RAW format at 16 bit, and relevant to 1 m 2 is about 96MB. THE COLOUR HEAD MODULE (RGB)
THE PORTABLE VERSION FALCON has designed and manufactured a convenient portable version of the IR SCANNER, having the following features : - modularity - lightness - ergonomic design - very fast decomposability - limited number of modules - modules portable in wheeled containers 1200 mm 1500 mm 1800 2500 mm (*) SCANNER IR
Matteo di Giovanni Madonna col Bambino e quattro Santi (detail - Duomo of Pienza) from Reflectogram to..... RGB image ! SCANNER IR
Maddalena - Dutch School -XVI century (London - National Gallery) from IR RGB SCANNER IR toto
Giovanni Bellini - Madonna col Bambino detail of underdrawing for the hands detail of underdrawing for the Jesus’ head SCANNER IR
Giorgione La Tempesta pentimento under Antenore’s figure SCANNER IR
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