An image scanner—often abbreviated to just scanner—is a device that optically scans images, printed text, handwriting or an object and converts it to a digital image. Commonly used in offices are variations of the desktop flatbed scanner where the document is placed on a glass window for scanning. Hand-held scanners, where the device is moved by hand, have evolved from text scanning "wands" to 3D scanners used for industrial design, reverse engineering, test and measurement, orthotics, gaming and other applications. Mechanically driven scanners that move the document are typically used for large-format documents, where a flatbed design would be impractical.
Modern scanners typically use a charge-coupled device (CCD) or a contact image sensor (CIS) as the image sensor, whereas drum scanners, developed earlier and still used for the highest possible image quality, use a photomultiplier tube (PMT) as the image sensor. A rotary scanner, used for high-speed document scanning, is a type of drum scanner that uses a CCD array instead of a photomultiplier. Non-contact planetary scanners essentially photograph delicate books and documents. All these scanners produce two-dimensional images of subjects that are usually flat, but sometimes solid; 3D scanners produce information on the three-dimensional structure of solid objects.
Digital cameras can be used for the same purposes as dedicated scanners. When compared to a true scanner, a camera image is subject to a degree of distortion, reflections, shadows, low contrast, and blur due to camera shake (reduced in cameras with image stabilization). Resolution is sufficient for less demanding applications. Digital cameras offer advantages of speed, portability and non-contact digitizing of thick documents without damaging the book spine. In 2010 scanning technologies were combining 3D scanners with digital cameras to create full-color, photo-realistic 3D models of objects.Scans are usually downloaded by a computer the unit is attached to. Some scanners are able to store scans on standalone flash media (e.g. memory cards and USB sticks).In the biomedical research area, detection devices for DNA microarrays are called scanners as well. These scanners are high-resolution systems (up to 1 µm/ pixel), similar to microscopes. The detection is done via CCD or a photomultiplier tubes.

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  1. C

    Help Drivers License Scanner.

    Mga mam/sir paano po ma scan ang barcode ng mga drivers license? Nag try po kasi ako nga mga ibat ibat scanner pero hindi po siya makakalabas ng info.
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    Lf wechat scanner po magpapascan po kami 6x accounts. 50maya each po sana
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    Baka meron pa nagpapa scan jan po ng wechat 50maya po sana. Tia
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    Pa help java scanner array

    Mga boss pa help po pano po i set yung command na add,10001,Jay,20 bale iisa lang lahat into 1 line? ito po code ko package College; import java.util.Scanner; public class studentMenu { public static void showStudentMenu(){ studentMethod sm = new studentMethod()...
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    Java Programming

    Mga boss ano po kaya mali dito sa code ko? Nagiging addition po kase tong division need help.
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    Visual Basic How to use digital persona?

    Guys tulungan nyo naman ako. Mayroon akong nabiling second hand na finger print scanner device? Ang tanong pano ko sya mag wowork using visual basic 2010 and mysql? Guys help me please.
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    Tutorial Mobile docs scanner worth of 250 pesos (free for 7hrs only) download na!

    ✔Wala ng paliguyligoy pa 7 hrs lang sya babalik ulit sa 250 pesos kaya download nyo na. ⬇⬇⬇⬇⬇ PLAYSTORE LINK Follow me for more. Kim john ®
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    Closed Security

    Wala naman sigurong may gusto na mavirusan ang PC nila diba? Unless IT expert ka and you're formulating your own AV. Going back, kung gusto niyo makasigurado na malinis yung file, try niyo tong site. Just paste the link and you're good to go. :)
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  11. X


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