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Rp1 John Rosado, Scanner Technology


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First PowerPoint Presentation for a Computer Apps Class.

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Rp1 John Rosado, Scanner Technology

  1. 1. Scanner Technology By: John Rosado
  2. 2. Introduction <ul><li>Scanners were once very rare and hard to </li></ul><ul><li>come by, now they are rather easy to find </li></ul><ul><li>and constantly being improved upon. </li></ul>Canon CanoScan N1240U HP ScanJet 5400C
  3. 3. Inner Workings Two diagrams are shown here. A diagram that shows how the interior of a conventional flatbed scanner is constructed (above) and a diagram showing the drum of a drum scanner and a loading magazine (right).
  4. 4. Drum Scanner <ul><li>A scanner that gets it’s name from a large glass drum the </li></ul><ul><li>paper is placed on for scanning. They take image </li></ul><ul><li>information from photomultiplier tubes (PMT). The paper </li></ul><ul><li>is mounted on an acrylic cylinder (the scanner drum) </li></ul><ul><li>which rotates at a high speeds while the object is passed </li></ul><ul><li>in front of precision optics that give the image information </li></ul><ul><li>to the PMTs. These scanners, however, are now used </li></ul><ul><li>less due to faster and less expensive flatbed scanners </li></ul><ul><li>being available. However, the drum scanner is still the </li></ul><ul><li>scanner of choice for films and are still used for high-end </li></ul><ul><li>projects due to their superior resolution, color gradation </li></ul><ul><li>and value structure. </li></ul>Fuji Celsis 6250 Drum Scanner The first scanned image of then three-month old Walden Kirsch, the son of the team leader behind the first scanner’s creation.
  5. 5. Flatbed Scanner <ul><li>Flatbed scanners are possible the most common scanners available and the easiest to acquire, </li></ul><ul><li>having replaced the drum scanner due to it’s speed in scanning and lesser cost. It is also the type of </li></ul><ul><li>scanner that is the easiest scanner to obtain for home use. It is usually made up of a glass pane, </li></ul><ul><li>where a bright light under it illuminates it and the moving optical ray. The optical ray is either a </li></ul><ul><li>charge-coupled device (CCD) or a Contact Image Sensor (CIS). They also usually contain three rows </li></ul><ul><li>of sensors with red, green and blue filters. Images are put face down on the glass with an opaque </li></ul><ul><li>cover placed over it to remove ambient light. The sensor and light source then move across the glass </li></ul><ul><li>pane, reading the entire area. </li></ul>CanoScan LiDE 30 USB Flatbed Scanner
  6. 6. Film Scanner <ul><li>A film scanner is used to scan positive (slides) or </li></ul><ul><li>negative film into a computer without needing to </li></ul><ul><li>make separate prints. Film scanners provide better </li></ul><ul><li>quality than flatbed scanners due to their ability to </li></ul><ul><li>manipulate the unchanged photographs or films, as </li></ul><ul><li>well as more thoroughly cleaning them by </li></ul><ul><li>removing scratches, dust and other disfigurements </li></ul><ul><li>to further improve the quality of the picture. </li></ul><ul><li>Low-end film scanners can sometimes only take 35 </li></ul><ul><li>mm (millimeter) film while medium to high-end </li></ul><ul><li>scanners can receive 35 mm, 120 mm and other </li></ul><ul><li>individual slides due to the usage of </li></ul><ul><li>interchangeable film loaders. Due to the </li></ul><ul><li>interchangeable loaders, this allows scanners with </li></ul><ul><li>this accessory to be used for various sizes and </li></ul><ul><li>packaging. </li></ul>Nikon Super CoolScan 5000 ED
  7. 7. Hand Scanners <ul><li>Handheld Document Scanners are scanners that are dragged across the photograph that is </li></ul><ul><li>to be scanned. Scanning documents in this manner usually requires one to have steady </li></ul><ul><li>hands in order to properly and effectively scan an item, otherwise the photo will be distorted </li></ul><ul><li>due to the uneven scanning. Hand scanners have a ‘Start’ button that usually must be held </li></ul><ul><li>throughout the scanning, switches to set the optical resolution and a roller that allows better </li></ul><ul><li>synchronization with a computer using clock pulse. Most of them were monochrome and </li></ul><ul><li>used green light-emitting diodes (LEDs) to brighten the image. Other forms of hand scanners </li></ul><ul><li>are typically used in certain stores for scanning and pricing products or bar-code data . </li></ul>CK30 Handheld Scanner Socket Cordless Hand Scanner 7E
  8. 8. 3D Scanners <ul><li>A 3D Scanner is a device that is used to collect data on the </li></ul><ul><li>shapes and appearances on an environment or real-world </li></ul><ul><li>object. The collected data is then used to create digital, </li></ul><ul><li>three-Dimensional (3-D) models used for many different </li></ul><ul><li>applications. These scanners are mostly and typically used in </li></ul><ul><li>the production of movies and video games. Other forms of </li></ul><ul><li>usage include industrial design, orthotics and prosthetics, </li></ul><ul><li>reverse engineering and prototyping, quality </li></ul><ul><li>control/inspection and documentation of cultural artifacts. </li></ul>NextEngine Desktop 3D Scanner
  9. 9. Applications Programming Interface <ul><li>An Applications Programming Interface (API) is a program that was created to simplify the uses of other </li></ul><ul><li>programs with the scanner, making it possible for the scanner to not need the specific details of a </li></ul><ul><li>program in order to use it. They are usually implemented as dynamically linked libraries, which </li></ul><ul><li>translates the API protocals into more primitive and common commands that are issued to a </li></ul><ul><li>hardware controller such as SCSI, USB and FireWall. There are also different types of API's, some </li></ul><ul><li>scanners even allowing the use of more than one. </li></ul><ul><li>TWAIN, the most common API made for low-end and home use, now used for large-scale scanning. </li></ul><ul><li>ISIS, which uses SCSI-II for performance and is used for large, departmental-scale machines. </li></ul><ul><li>SANE (Scanner Access Now Easy) is an open source API for accessing scanners. Unlike TWAIN, it does not handle the user's interface, allowing batch scans and transparent network access without any support from the device driver. </li></ul><ul><li>Windows Image Acquisition, an API created and provided by Microsoft. </li></ul>
  10. 10. Bundled Applications <ul><li>Scanners usually come with additional applications. </li></ul><ul><li>A scanning utility </li></ul><ul><li>A type of image-manipulating application (such as Photoshop)‏ </li></ul><ul><li>Optical Character Recognition (OCR)‏ </li></ul><ul><li>OCR is a type of software that allows the conversion of graphical text images into standard text that can </li></ul><ul><li>be altered using common word-processing and text-editing software. </li></ul>
  11. 11. References <ul><li>Wikipedia ( http:// / )‏ </li></ul><ul><li>Extreme Tech ( http:// / )‏ </li></ul><ul><li>Free Patents Online ( http:// / )‏ </li></ul><ul><li>Barcode Warehouse ( / ) </li></ul>