Differentiate Image Scanner and Data Scanner | Basics of ICT (5403)

 Basics of ICT (5403)

Question no 2.   Differentiate the following: –

(a) Image Scanner & Data Scanner

Image Scanner

Image scanner is a device which scans pictures, text or objects and converts them to digital images. The basic types of image scanners are flat bed, hand, film and drum scanners.

Flatbed scanners are what we call Xerox machines ,in which an object or document is placed on a glass pane and an opaque cover is lowered over it. A sensor and light moves along the pane, reflecting of the image placed on the glass. The cover prevents other light from interfering and the image becomes visible to the detector. Once an image is scanned into an image scanner, the data must be processed and sent to a computer. Most scanners read red-green-blue color from the color array.

The Depth of color depends on the array Characteristics, but is typically 24 bits at least. Higher quality models have a color depth of 48 bits or more. The pixel per inch measures the resolution of the image.

There are three main types of image scanners. These are hand scanners, film scanners and drum scanners. A hand image scanner comes in document or 3D forms. These are used to be manually moved across an object tor image to be scanned.

Photo copiers use flatbed scanner to capture an image, then it can be reprinted.

The scanner produces light from green LEDs which highlight and scan the image on to a computer to be viewed.  An image scanner can also be 3D, and these scanners are now the most popular form of hand scanners on the market today. These image scanners are able to compensate for the uneven movements of the hand byre lying on placement reference markers to mark correct position

 

Data Scanner

Scanner data are the data recorded by the retailers when consumers make purchases. They include, for each article sold in a store on a given day, the quantity of articles sold and the sales price.  They are transmitted daily by the retail chains to Insee.

These data are used in the compilation of the Consumer Price Index or in research on this indicator.

Context:

Scanner data constitute a rapidly expanding source of data with considerable potential for CPI purposes. They are also being used increasingly for purposes of hedonic analysis.

Source Publication:

ILO, IMF, OECD, Eurostat, UNECE, World Bank, 2004, Consumer Price Index Manual: Theory and Practice, International Labour Office, Geneva.