Flatbed Scanner
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A flatbed scanner optically scans images, text, or objects and converts them into a digital image. It works by placing the item to be scanned on a glass window. The quality of a scanner is judged by its color depth, resolution in pixels per inch (ppi), and density range (Drange). Higher-end scanners have greater color depth, resolution, and Drange, allowing them to capture more detail. Potential problems include scanner noise, dust, and improper operation, which can diminish image purity. The scanned image is converted to an RGB file that can be transferred and processed on a computer.
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Working of scanner
The document discusses the basic principles and components of scanners. It explains that scanners analyze images and process them to allow saving information to computer files. The key components of flatbed scanners are described as the CCD array, mirrors, scan head, glass plate, lamp, lens, cover, filters, stepper motor, and more. It then outlines the basic working of flatbed scanners which involves illuminating documents with a lamp, using mirrors and lenses to focus the image onto a CCD array, and transferring the digital image via interfaces like parallel, SCSI, or USB ports.
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The document discusses different types of scanners and how they work. It describes flatbed scanners, portable scanners, and sheetfed scanners. It also covers optical scanners, bar code readers, MICR, OCR, and OMR. Uses of scanners include copying documents, transmitting faxes, including images in documents, and analyzing text and images through character recognition.
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Data scanning devices allow direct data entry into computers from source documents, improving accuracy and timeliness over manual key entry. The main types are image scanners, optical character recognition (OCR) scanners, optical mark readers, bar code readers, and magnetic ink character recognition (MICR) readers. Digitizers are also used to convert pictures, maps, and drawings into digital formats.
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1) A flatbed scanner works by using a glass scanning surface where objects are placed. It scans images as a series of dots using rotating lamps with colored filters and a CCD sensor to generate a digitized image file.
2) When scanning, the CCD sensor moves across the glass platen to read the image as dots. Software then converts this into an electronic code that can be understood by the computer.
3) Flatbed scanners allow scanning of documents without bending them and can scan a variety of paper types and qualities as well as larger documents than sheet-fed scanners. Their glass surface risks scratching over time however.
Types of scanner........
Flatbed scanners are the most common and versatile scanner type. They scan documents placed on a glass surface using a light sensor and light source that sweep across the stationary document. Sheet feed scanners maximize throughput by moving documents past a stationary light source and sensor, while drum scanners provide the highest quality scans but are slower and more expensive. Microfilm and slide scanners are specialized for scanning film and photos. Digital cameras combine scanning and camera optics for a versatile scanning tool.
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The document defines and describes scanners and how they work. A scanner is an input device that scans images as a series of dots and introduces the information into the computer's memory. Scanners use rotating lamps with red, green, and blue filters to digitize images. Software then converts the scanned images into electronic codes that computers can understand. Flatbed scanners have a glass surface where objects are placed to be scanned by a scanning unit that moves across the image, converting it into a digitized file sent to the computer.
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1. The document discusses different types of scanners, including flatbed scanners, slide scanners, and handheld scanners.
2. Flatbed scanners work by placing an image face down on a glass pane, which is then scanned by a sensor and light source moving across the glass. Slide scanners illuminate slides and project the image onto a digital sensor. Handheld scanners are manually dragged across surfaces.
3. Scanners can scan images or documents and convert them to digital formats that can be inserted into documents, presentations, or emailed. Scanners can also scan directly to image or PDF file formats.
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1) A flatbed scanner works by using a glass scanning surface where objects are placed. It scans images as a series of dots using rotating lamps with colored filters and a CCD sensor to generate a digitized image file.
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3. Scanners can scan images or documents and convert them to digital formats that can be inserted into documents, presentations, or emailed. Scanners can also scan directly to image or PDF file formats.
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Electronic paper displays work like ordinary paper and use plastic substrates. They can hold static images indefinitely without using electricity. Plasma displays utilize small cells containing electrically charged gases to produce images. Speech output can include speech synthesis, which converts text to speech, or speakers and headphones. Output devices discussed include electronic paper, plasma displays, and speech synthesis technology.
Inkjet printers
Inkjet printing works by propelling droplets of ink onto paper or other surfaces from ink cartridges. There are two main methods - thermal inkjet uses heaters to vaporize ink and create bubbles that expel droplets, while piezoelectric inkjet uses electrical pulses to change the shape of a piezoelectric material and generate pressure to expel droplets. Inkjet printers have a housing, electronic card, printheads, and paper loading system and are commonly used for general printing though not recommended for high-quality photos.
Dot matrix printers
Dot matrix printers print characters by punching ink onto paper through a print head using patterns of dots to form letters. Each character is made up of a specific map of dots, such as the letter H having 7 dots in the first column, two dots in the fourth position for the next two columns, and then 7 dots to finish. While dot matrix printers are the cheapest option for printing and are simple to build and maintain, the resolution is very low and they do not print color well.
Touch Screens
There are four main types of touch screen technologies: capacitive, resistive, infrared grid, and optical imaging. Capacitive touch screens, made popular by Apple devices, are the most responsive and rely on changes in electrical current when a finger touches the screen. Resistive touch screens use a mesh between the screen and touch panel to register touches. Infrared grid touch screens are not common and use infrared light to detect touches. Optical imaging touch screens are new and use corner image sensors and infrared lighting to detect touch locations.
RFID
RFID scanners are devices that can interrogate RFID tags to gather information, such as recognizing credit cards or locating products around the world. They work by sending out signals that RFID tags receive and respond to with additional data, like product details and a unique identification number. While useful for retailers, RFID scanners also raise privacy issues as their long range means tags may be read without a person's knowledge and could potentially be used to track locations.
Digital still camera
Steven Sasson invented the first digital camera in 1975 at Kodak using a charge-coupled device image sensor. A digital camera encodes digital images digitally using an optical lens and image sensor such as CCD or CMOS that converts light into pixel values. Digital cameras come in various types including compact cameras for snapshots, bridge cameras resembling DSLRs, mirrorless cameras with interchangeable lenses, and digital single-lens reflex cameras which use a mirror to direct light through an optical viewfinder. Common file formats for digital images include JPEG, TIFF, and raw formats.
Bar code scanner
A bar code scanner is an electronic reader that uses a light source and sensor to translate optical bar codes into electrical signals. It illuminates codes with red light, detects the reflected light with a sensor, and converts the analogue signals into digital codes that can be decoded. Retail stores commonly use bar code scanners to identify products and access online information by scanning product bar codes.
Robert seddon greve 1433 the cd rom
A CD-ROM can store up to 783MB of data through a series of microscopic bumps imprinted in a spiral track on the disc from the inside to outside. A laser and optical system precisely reads the bumps, which reflect light differently than the spaces between bumps. This allows the reader to interpret the bits of data on the CD as it spins and the laser moves from the center to the outer edge of the disc.
Maxim klimov 1433 how rfid works
RFID uses radio waves to automatically identify objects by transferring data from tags attached to objects to an RFID reader. There are three main types of RFID tags: passive tags which have no battery and are powered by the reader's signal up to 20 feet away; semi-passive and active tags which have an internal battery allowing them to broadcast signals up to 100 feet; and types of tags differ in whether the stored data can be read, written to, or written to once only.
Rory pettitt 1433 computing presentation2
A touch-sensitive screen allows users to control information using their fingertips through multi-touch technology. Multi-touch screens work using mutual capacitance, which requires two layers of material - one that carries current and one that senses lines. When a user touches the screen, the touch is registered and raw data is captured and processed to remove noise and measure pressure points and touch areas to calculate exact coordinates. The signals then travel to the processor which analyzes the data to determine touch features like size, shape and location using gesture-interpretation software to determine the gesture and relay instructions to the active program. A mutual capacitance screen consists of several layers including an LCD display, glass substrate, sensing and driving lines, and a protective coating.
Igor bishko 1432 impact printers2
Impact printers physically strike paper to print, using electromagnets to move print pins that transfer ink from a ribbon to the paper. The three main types are dot matrix printers, which print one character at a time; daisy wheel printers, which rotate a character wheel; and line printers, which print an entire line at once. Barcode scanners illuminate barcodes with LEDs or lasers, use sensors to read the light reflection pattern, convert it to digital data, and decode it into text sent to a computer. Common illumination methods include single-point LEDs in wands/slots, linear LED arrays, and lasers that can scan from inches to feet away.
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Flatbed Scanner
- 1. Flatbed scanner by Igor Dmitrievykh
- 2. What is it? • In computing, 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. Common examples found in offices are variations of the desktop (or flatbed) scanner where the document is placed on a glass window for scanning.
- 3. how does it work?
- 4. how to judge the quality of a scanner? • Color depth varies depending on the scanning array characteristics, but is usually at least 24 bits. High quality models have 36-48 bits of color depth. • Another qualifying parameter for a scanner is its resolution, measured in ppi, sometimes more accurately referred to as Samplespi. Instead of using the scanner's true optical resolution, the only meaningful parameter, manufacturers like to refer to the interpolated resolution, which is much higher thanks to software interpolation. • The third important parameter for a scanner is its density range or Drange. A high density range means that the scanner is able to record shadow details and brightness details in one scan. Slower film can reach higher density than faster film. Consumer level flatbed scanners have a Drange in the 2.5-3.0 range, adequate for negative film. High end flatbed scanners can reach a Drange of 3.7.
- 5. are there any problems? • Purity can be diminished by scanner noise, optical flare, poor analog to digital conversion, scratches, dust, Newton’s rings, out of focus sensors, improper scanner operation, and poor software.
- 6. so what is out? • The scanned result is a non-compressed RGB image, which can be transferred to a computer's memory. Some scanners compress and clean up the image using embedded firmware. Once on the computer, the image can be processed with a raster graphics program (such as Photoshop or the GIMP) and saved on a storage device (such as a hard disk).
- 7. Thanks for watching, enjoy your day! enjoy your day!
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