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Frequently Asked Questions
about JUMBOSCAN
 

Why is output resolution so high ? 
Why is image capture  speed so important?
 
Why digitize? 
Will the lighting damage my fragile documents? 
 
Is a 720 Mb file size  too high? 
Why digitize the plans created on CAD computers? 
Why not digitize with a sheet-feed scanner? 
Is 150 dpi sufficient for large maps? 
How long does the data last? 
How may a 1m x 1.5m (3ft x 5 ft) document be digitized? 
How may a transparent document be digitized? 
Is higher resolution possible for text or features? 
How may a 3m x 2m (10 ft x 6.5 ft) document be digitized? 
How may a very large bound volume  be digitized? 
How may a document having an uneven surface be digitized ?

How may the focus be adjusted? 
Does Jumboscan have conical projections  optical limitations ? 
With what concerns the JumboScan my interest is drawn by the optical distortion on the "parameter" ?
Is a scanned picture also worked digitally ?
Is JumboScan perform a lot to scan aerials photographies ?

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Why is output resolution so high ? 
When it is necessary to reproduce very large documents. Besides, the definition need not be so high ; a document of 2m x 3m has a dpi of just over 150.  High resolution can be visually appealing when very large documents are reproduced or when very small details in images are viewed.

Why is image capture  speed so important? 
The Jumboscan’s production workflow saves time and labor cost when capturing large quantities of images.  For example,France the Land Registry acquired a Jumboscan to digitize 7.5 million pages (30,000 registries @ 250 pages each) of A1/D sized 22” x 34” land documents at 300 dpi because the Jumboscan’s speed compressed the project by three years by shaving 2 seconds per image off of any other proposed approach.

Why digitize? 
To store 
To transmit 
To consult directly or within a network 
To zoom on a document 
To duplicate ad infinitum without loss 
To file 
To restore documents 
To gain space, companies sometimes have whole buildings reserved for storing plans. 
To replace microfilm. 
 

Will the lighting damage my fragile documents?  
No.  
After many checks of our system of lighting, the laboratory of the LOUVRE authorized us to digitize masterpieces.  The rise in temperature during this short moment is to the maximum of 1°C. This kind of a light is qualified as " cold light". To be even more precise, our system is composed of 8 lamps of 11.500 lumens 150 W placed at 1 meter of the document (for a 80 cm X 80 cm painting size) , each lamp in concentred in one direction with an elliptical mirror, an internal secondary reflector double the output.  The luminous energy measured with a luwmeter on the painting is 30.000 lux (lm/m2) during the time of the beam sweep. The width of the beam is 1 inch, so we can write for a RGB scan at 300 dpi with exposure time of red=4ms ; Green=3ms ; blue=5ms the calculation :
(300*0.004+300*0.003+300*0.005)*30,000 = 108,000 lx.s For a more easy comparison converted in hour give : 30 lux x hour (lx.h).
By comparison a full day exposition in a museum is equal to 2500 lx.h

Is a 720 Mb file size  too high? 
What seems significant today, may not be so tomorrow. The power and capacity of computers multiplies by 1,000 every 10 years. Not forgetting that an image of 720 Mb can be compressed to 100 Mb almost without loss. However, not everyone works in color, which means that a grayscale image of 240 Mb is compressed to 45 Mb and a black and white to 30Mb without loss, leading to 213 images on a CD-Rom or 1,000 images on DVD-Rom. 
 
Why digitize the plans created on CAD computers? 
In most cases, paper plans are corrected by hand, or bear indications, a field report or the name of the person in charge. Last-minute corrections or essential information! 
Otherwise the paper plans would not be kept at all. 
The ISO 9002 company standard renders necessary paper plan archives.

Why not digitize with a sheet-feed scanner? 
There are several disadvantages: 
1 – they are limited to an A0 format 
2 – they are not easy to use 
3 – they cannot be used with damaged or torn documents 
4 – they cannot be used with documents pasted on copyboard, suspended by wooden rods, Sandborn Fire Maps, bound volumes and registers, laminated and encapsulated plans/maps and glass plates.
5 - they are limited to a certain thickness 
6 – the rollers may leave marks on the document 

Is 150 dpi sufficient for large maps? 
Yes, in line art (Bitmap), a size 2 character of 1 mm is perfectly legible. Any smaller and one would need a scanner in grayscale. 
 
How long does the data last? 
With compatible products on the market, floppy disks have moved from 170 KB to 320 KB to 740 KB then to 1,2 Mb, which are recopied onto hard disks, engraved on CD-Roms which we can recopy onto DVD-Roms etc. Digital data can be copied ad infinitum! 

 
How may a 1m x 1.5m (3ft x 5 ft) document be digitized? 
Jumbolux lighting systems may be flexibly oriented to enable horizontal scanning (document placed on a copystand) or vertical scanning (document placed on a copytable).  By using Jumboscan on a copy stand. 
 
How may a transparent document be digitized? 
By using Jumboscan on a repro stand with a lightbox. 
 
Is higher resolution possible for text or features? 
Yes, the resolution may be doubled.

Could a more advanced capture system be developed ?

Industry experts have agreed that the Jumboscan has almost reached not only the optical, but also, the mechanical and electronic limits.
 
How may a 3m x 2m (10 ft x 6.5 ft) document be digitized? 
There are several solutions:
1.
  Place the Jumboscan camera as horizontally mounted on a tripod/monopod and scan the document placed on a wall or easel within 3.9 m (12.8 ft) of the axis.
2.
  Place the Jumboscan camera in a mount that is suspended 4.5m (14.8 ft) from the object placed on a copytable or the floor.  The lens to object distance can be reduced to 3.1m (10.2 ft) when a 120mm lens is used.
 
How may a very large bound volume  be digitized? 
The Washington State Archives digitizes historical Assessors Record volumes sized 2 feet high x 3 ft wide (per page) by placing the volume on adjacent surfaces that are adjustable to hold each page in perfect plannular alignment to the CCD.

How may a document having an uneven surface be digitized ?
The Jumboscan System’s momentary brilliant illuminationenables the lens to be stopped down to therefore increase depth of field to accommodate documents that (for curatorial reasons) cannot be flattened or encapsulated.


How may the focus be adjusted? 
AUTOMATICALLY, using the computer software. 
 
Does Jumboscan have conical projections  optical limitations ? 
Unlike aerial photography (orthphotography) that requires orthocorrection to the earth’s curvature, the Jumboscan’s maximum longest lens to object distance has no distortion effect and requires no correction software.  For example, the Jumboscan GIS camera can be used to scan an aerial photo with the industry’s lowest average quadratic error equaling 0.005% or 10 µm [or less] across a 20 cm (7.8 in) wide photo.

With what concerns the JumboScan my interest is drawn by the optical distortion on the "parameter" ?
The strength of blending can be at its maximum but how has distortion been put aside and what causes the lens not to see each point directly on the vertical from top to bottom?
Especially  regarding aerophotography putting aise this error ortocorrection (of course, also remembering that distortion comes from the contours of the earth and relief. )

Is a scanned picture also worked digitally ?
for certain cameras and lens the parameters are quite trivial but the picture's quality can't avoid getting worse

We confirm that the distortion shown in "parameter" is 0,005%,
 
This distortion is only accurate for PLANS, such a map, an artwork, a photography. In this case, Jumboscan's optic correct distortion, i.e. the lens just focus on each point, directly at the vertical axis, from top to bottom. 
 
Is JumboScan perform a lot to scan aerials photographies ?
 
Aerial photographies scanned with Jumboscan will be perfect and without any geometry error. You will even never note the standard distorsion (Average Quadratic Error) of 0,005 % i.e. 10µm for a 20cm photo wide. 
 
To correct conic projections errors (earth rotundity, earth relief), you must use a stantard projection software and orthocorrection, there are numerous on the market. 
 
But you cannot afford to don't use Jumboscan, a perfect scanner, whp dpes perfect scans without geometry errors, because there is no software to correct these errors, because, by definition, these errors are variable




This website does not contain any contractual terms. Specifications and functionality  mentioned in this document are subject to change. Jumboscan and Jumbolux are registered trademarks by Lumiere Technology LT2 S.A.S.