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Optical mark recognition (OMR) is the scanning of paper to detect the presence or absence of a mark in a predetermined position. [4] Optical mark recognition has evolved from several other technologies. In the early 19th century and 20th century patents were given for machines that would aid the blind. [2]
v. t. e. Laser printing is an electrostatic digital printing process. It produces high-quality text and graphics (and moderate-quality photographs) by repeatedly passing a laser beam back and forth over a negatively charged cylinder called a "drum" to define a differentially charged image. [1] The drum then selectively collects electrically ...
The Internet Printing Protocol (IPP) is an Internet protocol for communication between client devices (computers, mobile phones, tablets, etc.) and printers (or print servers). IPP can run locally or over the Internet. Unlike other printing protocols, IPP also supports access control, authentication, and encryption, making it a much more ...
A flatbed scanner (Epson Perfection V850 Pro) with its lid open. Documents or images are placed face-down on the glass bed (the platen). 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.
A video showing an inkjet printer while printing a page. In computing, a printer is a peripheral machine which makes a durable representation of graphics or text, usually on paper. [ 1 ] While most output is human-readable, bar code printers are an example of an expanded use for printers. [ 2 ]
Color printing can also involve as few as one color ink or color inks which are not the primary colors. Using a limited number of color inks, or color inks in addition to the primary colors, is referred to as "spot color" printing. Generally, spot-color inks are formulations that are designed to print alone, rather than to blend with other inks ...
Contact image sensors (CIS) are image sensors used in flatbed scanners almost in direct contact with the object to be scanned. Charge-coupled devices (CCDs), the other kind of sensor often used in scanners, use mirrors to bounce light to a stationary sensor. Scanners using CISs are much smaller than ones that use CCDs, use typically a tenth as ...
A barcode reader or barcode scanner is an optical scanner that can read printed barcodes and send the data they contain to computer. [1] Like a flatbed scanner, it consists of a light source, a lens, and a light sensor for translating optical impulses into electrical signals. Additionally, nearly all barcode readers contain decoder circuitry ...