quiz2 #s 3-5

3. Explain how resolution affects the quality of a picture captured on a
digital camera.

• The higher the resolution, the better the image quality, but the more expensive the camera
• Pixel (picture element) is single point in electronic image
• Greater the number of pixels, the better the image quality

4. Describe the uses of voice recognition, Web cams, and video conferencing.

Web cam-video camera whose output displays on a Web page

Video conferencing-Two or more geographically separated people who use network or Internet to transmit audio and video data

5. Discuss how various scanners and reading devices work: optical scanners, optical readers, bar code readers, RFID readers, magnetic stripe card readers, MICR readers, and data collection devices.

Optical reader-Device that uses light source to read characters, marks, and codes and then converts them into digital data

Bar code reader-Uses laser beams to read bar codes

RFID reader-Reads information on the tag via radio waves

Magnetic stripe card reader-Reads the magnetic stripe on the back of a credit card. Exposure to a magnetic field can erase the contents of a card’s magnetic stripe

MICR reader-Can read text printed with magnetized ink. Banking industry almost exclusively uses MICR for check processing.

Data collection devices-Obtains data directly at location where transaction or event takes place. Transmits data over network or Internet