Chapter05(第4课).pptVIP

Scanners and Reading Devices How does a flatbed scanner work? p. 256 Fig. 5-31 Next Step 1: Place the document to be scanned face down on the glass window. Using buttons on the scanner or the scanner program, start the scanning process. Step 2: The scanner converts the document content to digital information, which is transmitted through the cable to the memory of the computer. Step 3: Once in the memory of the computer, users can display the image, print it, e-mail it, include it in a document, or place it on a Web page. Scanners and Reading Devices What is an optical(光学的) reader? p. 257 Fig. 5-32 Next Optical character recognition (OCR) reads characters in OCR font Optical mark recognition (OMR) reads hand-drawn pencil marks, such as small circles Device that uses light source to read characters, marks, and codes and then converts them into digital data Scanners and Reading Devices What is a turnaround document(回传文件)? p. 257 Fig. 5-33 Next Document that you return to the company that sent it Portion you return has information printed in OCR characters Scanners and Reading Devices What is a bar code(条形码) reader? Next Uses laser(激光) beams(柱) to read bar codes(条形码) Scanners and Reading Devices What is a bar code? p. 258 Fig. 5-35 Next Identification(鉴别) code that consists of a set of vertical(垂直的) lines and spaces(间隔) of different widths Universal Product Code (UPC) (通用产品代码) Other Input Devices What is an RFID(射频识别) reader? p. 259 Fig. 5-36 Next Reads information on the tag(标签) via radio waves Can be handheld devices or mounted in a stationary(静止的) object Other Input Devices What is a magnetic stripe card(磁卡) reader? p. 260 Fig. 5-37 Next Reads the magnetic stripe on the back of a credit card(信用卡) Exposure(曝光) to a magnetic field can erase the contents of a card’s magnetic stripe What is a magnetic-ink(磁性) character recognition (MICR) reader? Scanners and Reading Devices p. 260 Fig. 5-38 Next Can read text printed with magnetized ink Banking industry a