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Encyclopedia > Image scanner
Desktop scanner, with the lid raised. An object has been laid on the glass, ready for scanning.
Desktop scanner, with the lid raised. An object has been laid on the glass, ready for scanning.
Scan of the jade rhinoceros seen in the photograph above.

In computing, a scanner is a device that analyzes images, printed text, or handwriting, or an object (such as an ornament) and converts it to a digital image. Most scanners today are variations of the desktop (or flatbed) scanner. The flatbed scanner is the most common in offices. Hand-held scanners, where the device is moved by hand, were briefly popular but are now not used due to the difficulty of obtaining a high-quality image. Both these types of scanners use charge-coupled device (CCD) or Contact Image Sensor (CIS) as the image sensor, whereas older drum scanners use a photomultiplier tube as the image sensor. Flat-bed Scanner, taken by Adrian Pingstone in November 2003 and released to the public domain. ... Flat-bed Scanner, taken by Adrian Pingstone in November 2003 and released to the public domain. ... Scanned rhino, not taken with a camera but laid on the bed of a flat-bed scanner. ... Scanned rhino, not taken with a camera but laid on the bed of a flat-bed scanner. ... Penmanship is the art of writing clearly and quickly. ... A digital image is a representation of a two-dimensional image as a finite set of digital values, called picture elements or pixels. ... A specially developed CCD used for ultraviolet imaging in a wire bonded package. ... Contact Image Sensors (CIS) are a relatively recent technological innovation in the field of optical flatbed scanners that are rapidly replacing CCDs in low power and portable applications. ... Photomultipliers, or photomultiplier tubes (PMT) are extremely sensitive detectors of light in the ultraviolet, visible and near infrared. ...


Another category of scanner is a rotary scanner used for high-speed document scanning. This is another kind of drum scanner, but it uses a CCD array instead of a photomultiplier.


Other types of scanners are planetary scanners, which take photographs of books and documents, and 3D scanners, for producing three-dimensional models of objects, but this type of scanner is considerably more expensive relative to other types of scanners. A planetary scanner (also called an orbital scanner) is a type of image scanner for making scans of rare books and other easily damaged documents. ... A 3D scanner is a device that analyzes a real-world object or environment to collect data on its shape and possibly its appearance (i. ...


Another category of scanner are digital camera scanners which are based on the concept of reprographic cameras. Due to the increasing resolution and new features such as anti-shake, digital cameras become an attractive alternative to regular scanners. While still containing disadvantages compared to traditional scanners, digital cameras offer unmatched advantages in speed and portability. A SiPix digital camera next to a matchbox to show scale Nikon D200 SLR with Nikon film scanner, which converts film images to digital A Hasselblad 503CW with a digital camera back A digital camera is an electronic device used to capture and store photographs digitally, instead of using photographic...

Contents

Types

Nowadays there are different types of scanners depending on users purposes. Described below are the most commonly used types that can be found in the market:


Drum

Drum scanners capture image information with photomultiplier tubes (PMT) rather than the charged coupled device (CCD) arrays found in flatbed scanners and inexpensive film scanners. Reflective and transmissive originals are mounted to an acrylic cylinder, the scanner drum, which rotates at high speed while it passes the object being scanned in front of precision optics that deliver image information to the PMTs. Most modern color drum scanners use 3 matched PMTs, which read red, blue and green light respectively. Light from the original artwork is split into separate red, blue and green beams in the optical bench of the scanner.


The drum scanner gets its name from the large glass drum on which the original artwork is mounted for scanning, the are usually 11"x17" in size, but maximum size varies by manufacturer. One of the unique features of drum scanners is the ability to control sample area and aperture size independently. The sample size is the area that the scanner encoder reads to create an individual pixel. The aperture is the actual opening that allows light into the optical bench of the scanner. The ability to control aperture and sample size separately is particularly useful for smoothing film grain when scanning black and white and color negative originals.


While drum scanners are capable of scanning both reflective and transmissive artwork, a good quality flatbed scanner can produce excellent scans from reflective artwork. As a result, drum scanners are rarely used to scan prints now that high quality inexpensive flatbed scanners are readily available. Film, however, is where drum scanners continue to be the tool of choice for high-end applications. Because film can be wet mounted to the scanner drum and because of the exceptional sensitivity of the PMTs, drum scanners are capable of capturing very subtle details in film originals.


Currently only a few companies continue to manufacture drum scanners. While prices of both new and used units have come down over the last decade they still require a considerable monetary investment when compared to CCD flatbed and film scanners. However, drum scanners remain in demand due to their capacity to produce scans which are superior in resolution, color gradation and value structure. Also, since drum scanners are capable of resolutions up to 12,000 PPI, their use is generally recommended when a scanned image is going to be enlarged. The initials PPI have several meanings: Italian Popular Party Parallel Peripheral Interface - a connection for driving LCD displays on processors such as the Blackfin Patient and Public Involvement - Forums for English health trusts Payment protection insurance Personal & Private Information (PPI Data) Philips Phonographische Industries - The original name for Philips Records...


In most current graphic arts operations, very high quality flatbed scanners have replaced drum scanners, being both less expensive and faster. However, drum scanners continue to be used in high-end applications, such as museum-quality archiving of photographs and print production of high-quality books and magazine advertisements. In addition, due to the greater availability of pre-owned units many fine art photographers are acquiring drum scanners, which has created a new niche market for the machines.

The first scanned image
The first scanned image

The first image scanner ever developed was a drum scanner. It was built in 1957 at the US National Bureau of Standards by a team led by Russell Kirsch. The first image ever scanned on this machine was a 5 cm square photograph of Kirsch's then-three-month-old son, Walden. The black and white image had a resolution of 176 pixels on a side.[1] Image File history File links Metadata No higher resolution available. ... Image File history File links Metadata No higher resolution available. ... Year 1957 (MCMLVII) was a common year starting on Tuesday (link displays the 1957 Gregorian calendar). ... As a non-regulatory agency of the United States Department of Commerce’s Technology Administration, the National Institute of Standards (NIST) develops and promotes measurement, standards, and technology to enhance productivity, facilitate trade, and improve the quality of life. ... Black-and-white is a broad adjectival term used to describe a number of monochrome forms of visual arts. ... This example shows an image with a portion greatly enlarged, in which the individual pixels are rendered as little squares and can easily be seen. ...


Flatbed

A flatbed scanner is usually composed of a glass pane (or platen), under which there is a bright light (often xenon or cold cathode fluorescent) which illuminates the pane, and a moving optical array, whether CCD or CIS. Color scanners typically contain three rows (arrays) of sensors with red, green, and blue filters. Images to be scanned are placed face down on the glass, an opaque cover is lowered over it to exclude ambient light, and the sensor array and light source move across the pane reading the entire area. An image is therefore visible to the charge-coupled device only because of the light it reflects. Transparent images do not work in this way, and require special accessories that illuminate them from the upper side. In letterpress printing, a platen is the perfectly flat steel (or earlier, wooden) plate which is pressed onto the back of paper to cause an impression to be made from the type. ... General Name, Symbol, Number xenon, Xe, 54 Chemical series noble gases Group, Period, Block 18, 5, p Appearance colorless Standard atomic weight 131. ... A compact fluorescent lamp A fluorescent lamp is a type of electric lamp that excites argon and mercury vapor to create luminescence. ...


Hand

Hand scanners are manual devices which are dragged across the surface of the image to be scanned. Scanning documents in this manner requires a steady hand, as an uneven scanning rate would produce distorted images. They typically have a "start" button which is held by the user for the duration of the scan, some switches to set the optical resolution, and a roller which generates a clock pulse for synchronisation with the computer. Most hand scanners were monochrome, and produced light from an array of green LEDs to illuminate the image. A typical hand scanner also had a small window through which the document being scanned could be viewed. They were popular during the early 1990s and usually had a proprietary interface module specific to a particular type of computer, usually an Atari ST or Commodore Amiga. A photograph of a sign in grayscale The same photograph in black and white Monochrome comes from the two Greek words mono (μωνο, meaning one), and chroma (χρωμα, meaning surface or the color of the skin). A monochromatic object has a single color. ... External links LEd Category: TeX ... The Atari ST is a home/personal computer that was commercially popular from 1985 to the early 1990s. ... This article is about the family of home computers. ...


Quality

Scanners typically read red-green-blue color (RGB) data from the array. This data is then processed with some proprietary algorithm to correct for different exposure conditions and sent to the computer, via the device's input/output interface (usually SCSI or LPT in machines pre-dating the USB standard). Color depth varies depending on the scanning array characteristics, but is usually at least 24 bits. High quality models have 48 bits or more color depth. The other qualifying parameter for a scanner is its resolution, measured in pixels per inch (ppi), sometimes more accurately referred to as samples per inch (spi). Instead of using the scanner's true optical resolution, the only meaningful parameter, manufacturers like to refer to the interpolated resolution, which is much higher thanks to software interpolation. As of 2004, a good flatbed scanner has an optical resolution of 1600–3200 ppi, high-end flatbed scanners can scan up to 5400 ppi, and a good drum scanner has an optical resolution of 8000–14,000 ppi. A representation of additive color mixing—In CRT based (analog electronics) television three color electron guns are used to stimulate such an arrangement of phosphorescent coatings of the glass, the resultant reemission of photons providing the image seen by the eye. ... Energy Input: The energy placed into a reaction. ... This article or section does not cite any references or sources. ... LPT is the original, yet still common, name of the parallel port interface on IBM PC-compatible computers. ... Note: USB may also mean upper sideband in radio. ... Color depth is a computer graphics term describing the number of bits used to represent the color of a single pixel in a bitmapped image or video frame buffer. ... Image resolution describes the detail an image holds. ... The square shown above is 200 pixels by 200 pixels. ... Samples per inch (SPI) is a measurement of the resolution of an image scanner, in particular the number of individual samples that are taken in the space of one inch. ... In the mathematical subfield of numerical analysis, interpolation is a method of constructing new data points from a discrete set of known data points. ... 2004 is a leap year starting on Thursday of the Gregorian calendar. ...


Manufacturers often claim interpolated resolutions as high as 19,200 ppi; but such numbers carry little meaningful value, because the number of possible interpolated pixels is unlimited. The higher the resolution, the larger the file. In most cases, there is a trade-off between manageable file size and level of detail. Digital zoom is a method of zooming on a digital camera either by increasing the size of the pixels in the image or by interpolating between them. ...


The third important parameter for a scanner is its density range. A high density range means that the scanner is able to reproduce shadow details and brightness details in one scan.


Computer connection

Scanning the document is only one part of the process. For the scanned image to be useful, it must be transferred to a computer. The amount of data generated by a scanner can be very large: a 600 DPI 9"x11" (slightly larger than A4 paper) uncompressed 24-bit image consumes about 100 megabytes of uncompressed data in transfer and storage on the host computer. Recent scanners can generate this volume of data in a matter of seconds, making a fast connection desirable. ReBoot character, see Megabyte (ReBoot). ...


There are four common connections used by scanners:


Parallel - Connecting through a parallel port is the slowest transfer method available. Early scanners had parallel port connections that could not transfer data faster than 70 kilobytes/second. Parallel may refer to: Parallel (geometry) Parallel (latitude), an imaginary east-west line circling a globe Parallelism (grammar), a balance of two or more similar words, phrases, or clauses Parallel (manga), a shōnen manga by Toshihiko Kobayashi Parallel (video), a video album by R.E.M. The Parallel, an... This article is about the Centronics style port. ... This article is about the Centronics style port. ... A kilobyte (derived from the SI prefix kilo-, meaning 1,000) is a unit of information or computer storage equal to either 1,000 bytes or 1,024 bytes (210), depending on context. ... This article is about the unit of time. ...


Small Computer System Interface (SCSI), which is supported by most computers only via an additional SCSI interface. Some SCSI scanners are supplied together with a dedicated SCSI card for a PC, although any SCSI controller can be used. During the evolution of the SCSI standard speeds increased, with backwards compatibility; a SCSI connection can transfer data at the highest speed which both the controller and the device support. SCSI has been largely replaced by USB and Firewire, one or both of which are directly supported by most computers, and which are easier to set up than SCSI. This article or section does not cite any references or sources. ...


Universal Serial Bus (USB) scanners can transfer data fast, and are easier to use and cheaper than SCSI devices. The early USB 1.1 standard could transfer data at only 1.5 megabytes per second, but the later USB 2.0 standard can theoretically transfer up to 60 megabytes per second (although everyday rates are much lower), resulting in faster operation. Note: USB may also mean upper sideband in radio. ...


FireWire is a somewhat faster interface than USB. FireWire is ideal for scanning high-resolution images which require the transfer of much data. The 6-pin and 4-pin FireWire Connectors The alternative ethernet-style cabling used by 1394c FireWire is Apple Inc. ...


A computer needs software, called a driver, that knows how to communicate with the scanner. Most scanners use a common language, TWAIN. The TWAIN driver, originally used for low-end and home-use equipment and now widely used for large-volume scanning, acts as an interpreter between any application that supports the TWAIN standard and the scanner. This means that the application does not need to know the specific details of the scanner in order to access it directly. For example, you can choose to acquire an image from the scanner from within Adobe Photoshop because Photoshop supports the TWAIN standard. Windows XP loading drivers during a Safe Mode bootup A device driver, or software driver is a computer program allowing higher-level computer programs to interact with a computer hardware device. ... TWAIN is a standard for acquiring images from image scanners: an image capture API for Microsoft Windows and Apple Macintosh operating systems. ...


Other scanner drivers that can be also used are:


ISIS, created by Pixel Translations, which still uses SCSI-II for performance reasons, is used by large, departmental scale, machines. This article discusses the ancient goddess Isis. ...


SANE (Scanner Access Now Easy) is a free/open source API for accessing scanners. Originally developed for Unix and Linux operating systems, it has been ported to OS/2, Mac OS X, and Microsoft Windows. Unlike TWAIN, SANE does not handle the user interface. This allows batch scans and transparent network access without any special support from the device driver. Scanner Access Now Easy (SANE) is an application programming interface (API) that provides standardized access to any raster image scanner hardware (flatbed scanner, handheld scanner, video- and still-cameras, frame-grabbers, etc. ... This article is about free software as used in the sociopolitical free software movement; for non-free software distributed without charge, see freeware. ... Open source refers to projects that are open to the public and which draw on other projects that are freely available to the general public. ... Filiation of Unix and Unix-like systems Unix (officially trademarked as UNIX®) is a computer operating system originally developed in 1969 by a group of AT&T employees at Bell Labs including Ken Thompson, Dennis Ritchie and Douglas McIlroy. ... This article is about operating systems that use the Linux kernel. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... Mac OS X (IPA: ) is a line of graphical operating systems developed, marketed, and sold by Apple Inc. ... Windows redirects here. ...


In addition to the driver, most scanners come with other software. Typically, a scanning utility and some type of image editing application are included. A lot of scanners include OCR software. OCR allows you to scan in words from a document and convert them into computer-based text. It uses an averaging process to determine what the shape of a character is and match it to the correct letter or number. OCR may refer to: transvaginal OoCyte Retrieval Optical character recognition — computer software designed to translate images of typewritten text into machine-editable text OCR (examination board), a British examination board Official Cash Rate Original cast recording Optimum currency region OverClocked Remix Office of Civil Rights - a common sub-agency or...


Output data

The scanned result is a non-compressed RGB image which can be transferred to a computer's memory. Some scanner compress and clean up the image using embedded firmware. Once on the computer, the image can be processed with a raster graphics program (such as Photoshop or the GIMP) and saved on a storage device (such as a hard disk). A microcontroller, like this PIC18F8720 is controlled by firmware stored inside on FLASH memory In computing, firmware is a computer program that is embedded in a hardware device, for example a microcontroller. ... Suppose the smiley face in the top left corner is an RGB bitmap image. ... Adobe Photoshop is a bitmap graphics editor (with some text and vector graphics capabilities) published by Adobe Systems. ... For other uses, see Gimp (disambiguation). ... Typical hard drives of the mid-1990s. ...


In common use, scanned pictures are stored on a computer's hard disk, normally in image formats such as JPEG, TIFF, Bitmap, and PNG. Some scanners can also be used to capture editable text, so long as the text can be read by the computer in a discernable font. This process is called Optical Character Recognition (OCR). Typical hard drives of the mid-1990s. ... JPG redirects here. ... This article is about TIFF, the computer image format. ... This article is about the storage organization of raster images. ... PNG may stand for: Persona non grata, literally meaning an unwelcome person, is a term used in diplomacy with a specialised and legally defined meaning. ... A font can mean: A member of a typeface family; or digital font - file format that encapsulates a typeface family in a database. ... Optical character recognition, usually abbreviated to OCR, is a type of computer software designed to translate images of handwritten or typewritten text (usually captured by a scanner) into machine-editable text, or to translate pictures of characters into a standard encoding scheme representing them (e. ...


Document processing

The scanning or digitization of paper documents for storage makes different requirements of the scanning equipment used than scanning of pictures for reproduction. While documents can be scanned on general-purpose scanners, it is more efficiently performed on dedicated document scanners manufactured by Atiz Innovation, Böwe Bell & Howell, Canon, Epson, Fujitsu, HP, Kodak and other companies. Abraham Zapruders Bell & Howell Zoomatic movie camera, in the collection of the US National Archives Founded in 1907 and headquartered in Skokie, Illinois, the Bell & Howell Company merged with Böwe Systec Inc in 2003 to become Böwe Bell & Howell. ... Canon Inc. ... A four colour Epson Stylus C45 inkjet printer Epson is one of the worlds largest manufacturers of inkjet, dot-matrix and laser printers, scanners, desktop computers, business, multimedia and home theatre projectors, point of sale docket printers and cash registers, laptops, integrated circuits, LCD components and other associated electronic... For the district in Saga, Japan, see Fujitsu, Saga. ... The Hewlett-Packard Company (NYSE: HPQ), commonly known as HP, is a very large, global company headquartered in Palo Alto, California, United States. ... Eastman Kodak Company (NYSE: EK) is a large multinational public company producing photographic equipment. ...


When scanning quantities of documents, speed and paper-handling is very important, but the resolution of the scan will normally be much lower than for good reproduction of pictures.


Document scanners have document feeders, usually larger than those sometimes found on copiers or all-purpose scanners. Scans are made at high speed, perhaps 20 to 150 pages per minute, often in grayscale although many scanners support color. Many scanners can scan both sides of double-sided originals (duplex operation). Sophisticated document scanners have firmware of software that cleans up scans of text as they are produced, eliminating accidental marks and sharpening type; this would be unacceptable for photographic work where marks cannot reliably be distinguished from desired fine detail. Files created are compressed as they are made. A microcontroller, like this PIC18F8720 is controlled by firmware stored inside on FLASH memory In computing, firmware is a computer program that is embedded in a hardware device, for example a microcontroller. ... Computer software (or simply software) refers to one or more computer programs and data held in the storage of a computer for some purpose. ...


The resolution used is usually from 150 to 300 dpi, although the hardware may be capable of somewhat higher resolution; this produces images of text good enough to read and for optical character recognition (OCR), without the higher demands on storage space required by higher-resolution images. Dots per inch (DPI) is a measure of printing resolution, in particular the number of individual dots of ink a printer or toner can produce within a linear one-inch (2. ... Optical character recognition, usually abbreviated to OCR, is a type of computer software designed to translate images of handwritten or typewritten text (usually captured by a scanner) into machine-editable text, or to translate pictures of characters into a standard encoding scheme representing them (e. ...


Document scans are often processed using OCR technology to create editable and searchable files. Most scanners use ISIS or Twain device drivers to scan documents into TIFF format so that the scanned pages can be fed into a document management system that will handle the archiving and retrieval of the scanned pages. Lossy JPEG compression, very efficient for pictures, is undesirable, as straight edges take on a jagged appearance, and solid black (or other color) text on a light background compresses well with lossless compression formats. Optical character recognition, usually abbreviated to OCR, is a type of computer software designed to translate images of handwritten or typewritten text (usually captured by a scanner) into machine-editable text, or to translate pictures of characters into a standard encoding scheme representing them (e. ... This article discusses the ancient goddess Isis. ... TWAIN is a standard for acquiring images from image scanners: an image capture API for Microsoft Windows and Apple Macintosh operating systems. ... This article is about TIFF, the computer image format. ... A document management system (DMS) is a computer system (or set of computer programs) used to track and store electronic documents and/or images of paper documents. ...


While paper feeding and scanning can be done automatically and quickly, preparation and indexing are necessary and human time-consuming. Preparation involves manually taking the papers to be scanned and making sure that they are in order, unfolded, without staples or anything else that might jam the scanner.


Indexing involves associating keywords to files so that they can be retrieved by content. This process can sometimes be automated to some extent, but is likely to involve manual labour. One common practice is the use of barcode recognition technology: during preparation barcode sheets with folder names are inserted into the document files, folders and document groups. Using automatic batch scanning, the documents are saved into the appropriate folders and an index is created for integration into document management software systems. Wikipedia encoded in Code 128 Wikipedia encoded in Code 93 Wikipedia, the free encyclopedia encoded in the DataMatrix 2D barcode For the taxonomic method, see DNA barcoding. ...


A specialized form of document scanning is book scanning. Technical difficulties arise from the books usually being bound and sometimes fragile and irreplaceable, but some manufacturers have developed specialized machinery to deal with this. For instance, Atiz DIY scanner uses a V-shaped cradle and a V-shaped transparent platen to handle brittle books. Often special robotics are used to turn the pages automatically. Book scanning is the process of converting physical books into electronic books (e-books) via image scanning. ... Robotics is the science and technology of robots, their design, manufacture, and application. ...


Infrared cleaning

Main article: Infrared cleaning

Infrared cleaning is a technique used to remove dust and scratches from film and most modern scanners incorporate this feature. It works by scanning the film with infrared light. From this, it is possible to detect dust and scratches that cut off the infrared light and they can then be automatically removed based on their position, size, shape and surroundings. It has been suggested that Digital_ICE be merged into this article or section. ...


Scanner manufacturers usually have their own name attached to this technique. For example, Epson, Nikon, Microtek and others use Digital ICE, while Canon uses its own Film Automatic Retouching and Enhancement system.[2] A four colour Epson Stylus C45 inkjet printer Epson is one of the worlds largest manufacturers of inkjet, dot-matrix and laser printers, scanners, desktop computers, business, multimedia and home theatre projectors, point of sale docket printers and cash registers, laptops, integrated circuits, LCD components and other associated electronic... For other uses, see Nikon (disambiguation). ... Microtek International Inc. ... Digital Image Correction and Enhancement (ICE) is a technology developed by Kodaks Austin Development Center, formerly Applied Science Fiction that automatically removes surface defects, such as dust and scratches, from scanned images. ... Canon Inc. ...


Scanner Music

Flatbed scanners are capable of synthesising simple musical scores due to the variable speed (and tone) of their stepper motors. This property can be applied for hardware diagnostics, for example the HP Scanjet 5 plays Ode to Joy if powered on with SCSI ID set to zero. Windows and Linux based software is available for several brands and types of flatbad scanners to play MIDI files for fun purposes.[3] The top electromagnet (1) is charged, attracting the topmost four teeth of a sprocket. ... To Joy (An die Freude in German, in English often familiarly called the Ode to Joy rather than To Joy) is an ode written in 1785 by the German poet and historian Friedrich Schiller, known especially for its musical setting by Ludwig van Beethoven in the fourth and final movement...


See also

A typical barcode scanner. ... A film scanner is a specialized device made for scanning photographic film, either in standard 35mm format, slides, or medium format. ... Optical character recognition, usually abbreviated to OCR, is a type of computer software designed to translate images of handwritten or typewritten text (usually captured by a scanner) into machine-editable text, or to translate pictures of characters into a standard encoding scheme representing them (e. ...

References

  1. ^ NIST Tech Beat, May 27, 2007
  2. ^ Film Automatic Retouching and Enhancement. Canon. Retrieved on 2007-05-02.
  3. ^ The oh so musical scanner. uneasysilence.com (2004-10-04). Retrieved on 2007-06-24.

Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era in the 21st Century. ... May 2 is the 122nd day of the year in the Gregorian calendar (123rd in leap years). ... Year 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ... is the 277th day of the year (278th in leap years) in the Gregorian calendar. ... Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era in the 21st Century. ... is the 175th day of the year (176th in leap years) in the Gregorian calendar. ...

External links

  • Scanner at the Open Directory Project
  • Quality criteria and testing procedures for book scanners
  • "Is Drum Scanning Really Alive and Well?" from Digital Output by Jim Rich
  • "Can a Fine-Art Large-Format Photographer Find Happiness With a $30,000 Scanner?" by Bill Glickman
  • [1] USPTO
  • How to choose a scanner

  Results from FactBites:
 
Cordless image scanner - Patent 5550938 (2736 words)
An image scanner according to claim 7, wherein said plurality of modes of operation includes a display mode, and when said control means causes said scanner to be in said display mode of operation, said control means enables said display means to display data stored in said data storing means.
An image scanner according to claim 7, wherein said plurality of modes of operation includes a storing mode, and when said control means causes said scanner to be in said storing mode of operation, said control means enables said data storing means to store image data input through said input means and said reading means.
An image scanner according to claim 7, wherein said plurality of modes of operation includes a communication mode, and when said control means causes said scanner to be in said communication mode of operation, said control means enables said communication means to communicate said stored image data with said host computer.
Image scanner - Wikipedia, the free encyclopedia (1982 words)
In computing, a scanner is a device that analyzes an image (such as a photograph, printed text, or handwriting) or an object (such as an ornament) and converts it to a digital image.
A flatbed scanner is usually composed of a glass pane (or platen), under which there is a bright light (often xenon or cold cathode fluorescent) which illuminates the pane, and a moving optical array, whether CCD or CIS.
Images to be scanned are placed face down on the glass and the sensor array and light source move across the pane reading the entire area.
  More results at FactBites »

 
 

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