elektronika: Image scanner

Evidence: 100 • authority: 72

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. The most common type of scanner used in the home and the office is the flatbed scanner, where the document is placed on a glass bed. A sheetfed scanner, which moves the page across an image sensor using a series of rollers, may be used to scan one page of a document at a time or multiple pages, as in an automatic document feeder. A handheld scanner is a portable version of an image scanner that can be used on any flat surface. Scans are typically downloaded to the computer that the scanner is connected to, although some sca…

Evidence: 50 • authority: 72

ScanJet is a line of desktop flatbed and sheetfed image scanners originally sold by Hewlett-Packard (HP), later HP Inc., since 1987. It was the first commercially widespread image scanner on the market, as well as one of the first scanners aimed at the small office/home office market. It was originally designed to complement the company's LaserJet series of laser printers and allowed HP to compete in the burgeoning desktop publishing market of the 1980s. The grayscale-only ScanJet Plus, co-developed with Canon and released in 1989, was a massive commercial success and had a wide influence in scanner design. For almost a decade at the low end of the market, the ScanJet Plus was a de facto st…

Evidence: 42 • authority: 88

Evidence: 42 • authority: 80

Evidence: 42 • authority: 92

Evidence: 42 • authority: 92

Identity Document Presentation Attack Detection in Visible Light with Illumination-Controlled Scanner.. A reliable sign of the absence of a document presentation attack, when a print copy is presented instead of the original document, is the presence of such security features as OVDs (Optical Variable Devices), for example, holograms. To check the presence of holograms, it is sufficient to use the visible light and a series of document images captured with a varying angle of incidence and reflection of light. It can be achieved either by changing the position of the document or by changing the position of the illumination source. This work proposes a method for detecting holograms on identi…

Evidence: 42 • authority: 72