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In the biomedical research area, detection devices for DNA microarrays are called scanners as well. Some scanners are able to store scans on standalone flash media (e.g. Scans are usually downloaded by a computer the unit is attached to.

In 2010 scanning technologies were combining 3D scanners with digital cameras to create full-color, photo-realistic 3D models of objects. Digital cameras offer advantages of speed, portability and non-contact digitizing of thick documents without damaging the book spine. Resolution is sufficient for less demanding applications. 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). 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.ĭigital cameras can be used for the same purposes as dedicated scanners.

Non-contact planetary scanners essentially photograph delicate books and documents. A rotary scanner, used for high-speed document scanning, is a type of drum scanner that uses a CCD array instead of a photomultiplier. 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. Mechanically driven scanners that move the document are typically used for large-format documents, where a flatbed design would be impractical. 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. Commonly used in offices are variations of the desktop flatbed scanner where the document is placed on a glass window for scanning. Documents or images are placed face-down beneath the cover (shown closed here).Īn 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.