What Is Optical Mark Reader, Optical Bar-code Reader

Computers Fundamentala

OCR scans the characters by photo-electricity and converts the reflected light data into binary data (1 and 0) and inputs it into the computer. These are recognized in the computer from the already saved standard OCR font (Fon). Typical OCR speeds are 1,500 to 3.3000 characters per second. OCK is mostly used in Billing System.

OMR (Optical Mark Reader) 

OMR is used to check the answer sheet of an examination. These The question papers in the examinations have alternative answers and the student has to mark one of the four or five alternatives in his answer sheet.have to be filled.

In this, light is shone on the thin paper and the reflected light is checked, which is present. The intensity of the reflected light from this part of the paper will be less. This technique is to fill only the boxes made at certain places on the card or form. The speed of OMR is slow. Its transfer rate (Data Transfer Rate) is 200 to 250 pages per minute.

OBR (Optical Bar-code Reader) 

The main function of OBR is to scan the vertical bar which is fixed for different. It is used to read the Bars printed on the back of books and Bars printed on the back of various products.

(ii) Tracker Ball This is a Pointing Device, it is almost similar to the mouse. We can think of it as a mouse held upside down, with the ball facing up. When the ball is rotated with the thumb, palm or finger of the hand, the pointer is set in place.

Tracker hair is specially made for children, through which games can be played on computer. Tracker hair is also used in place of mouse in laptop computer.Chir-Tracker Child In Laptop Is.

(iii) Lightpen 

 Sitepen is used to draw any shape on the computer screen. It is also a Pointing Device. There is a photo cell in the lightpen, when we make a picture or figure on the computer screen with the lightpen, then it takes the transmit from its screen and enters inside the processor. gets done.SitePane is also used to select the money given in the menu. through this Any shape created can be saved in the computer's memory. It is widely used in the works of CAD (Computer Aided Design) etc. 

(iv) Plotter-Seater

Plotter-Seater  is an output device which can display charts, pictures, A picture-lightpen is used to present drawings, designs and other types of hard copy. Plotters are generally of two types – em and flat bed plotter. In a drum plotter, the paper on which the design is to be made is placed on top of the em. The em moves back and forth for vertical motion. In this technique, one or more pens are also used, which are horizontally attached to it. im and pen Together they move under the control of the computer, when both move together, graphs and designs are made.

In a flat bed plotter the paper is placed in a fixed position on a bed or tray. A pen (Pem) is mounted on an arm, which is driven by a motor on the paper up-down (-) and left-right (1-axis). The computer controls the pen along the axis and draws the shape on the paper.

(v) With the help of Speaker and Sound Card seeker, we can easily receive and listen to the sound (voice), music etc. of all the Shrigrams of a multimedia computer system. Through the speaker, we can get full enjoyment of different sounds of music, movies and games.

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