Digitalization of the documents

to digitize a document, it is necessary to acquire a digitizer of documents or scanner. This data-processing peripheral is provided with mobile sensors (CIS) or fixed (CDD) which translate the reflection of the light (document opaque) or the penetration of the light (transparent document) of the document in order to transform the image swept by a ray of light into numerical data. The various techniques/proceeded from numérisationPremièrement, digitalization in mode not offers one made exceptional for those which must precede quality as in the field of graphic arts for example. On the other hand, like digitalization is made pixel by pixel or point by point, the operation is very long, especially if the document is of important size. This technique thus is rather reserved to the professionals of the image. Secondly, linear digitalization/flat is done by band and explores the document with scanner line by line. Returned is adequate and the operation lasts only a few moments, which makes this most handy technique for a domestic and/or office automation use. Thirdly, matric digitalization allows an extremely fast operation because all the document is treated in only once. On the other hand, quality is succeeded and the technique is especially intended for the digitalization of documents of less importance or for a specific utility without thinking of filing. The various scanners according to the office automation needs for utilisationLes scanners are standard products which use the system of digitalization flat. The resolution is of good quality but one will regret the limit of digitalization to a3 format, even A4 for many references. The office automation scanners are normally intended to digitize of the independent sheets but it is possible of scanner of the documents connected with the risk more or less to deteriorate them. Moreover, one often notes the curves of the document on the digital image because it is difficult to put a book flat. The scanners with run, them, are usable only with independent sheets because the document is involved in the scanner while the sensors of this one are fixed. One finds this system in the combined printers (printing/scanner/fax). Certain models (with a back and a system of rétroéclairage) make it possible to digitize of the transparent documents (slides, negative,…) but for this type of operations, the ideal is to use a scanner of slides, designed for this purpose. The scanners of book, whose device of scan is on the top, are designed not to damage the documents connected as well as the books which cannot open completely. These scanners of books flat offer a quality higher than the scanners in addition to the advantage of being able to treat large sizes (A1 for elaborate scanners A2/A3 for the more general materials). It is also preferable to choose the models which use the system of sweeping rather than the optical analysis of the document. In the form of pen or of scraper, the scanner with hand is ideal for more the mobile users, in particular those which work on their laptop. It is then enough to make ravel the tool on the document with scanner. Only disadvantage, the scanner with hand requires a certain skill to sweep the document under penalty of error. With time, the movement will be done more precise. For those which seek a quality of exception, the drum scanners use the technique in mode not. The disadvantage is in the possibility of scanner only fine documents (1mm thickness to more) and enroulables on a cylinder. The numerical cameras (APN) are also solutions of digitalization. Indeed, it is enough to take in photograph the document to be digitized to obtain its digital image. Quality depends then primarily on the features of the APN from 8 MégaPixels, digitalization is completely suitable. It does not remain whereas to transfer your image digitized in your computer. As an indication, the digitalization of object (digitalization in 3D) is possible by using vertical scanners or the “benches of repro”. This digitalization is based on the principles of the photograph numérique.