What is the scan line?

The

scan line usually refers to one vertical resolution line that passes horizontally on the screen of the Cathode Ray (CRT) screen (CRT) or on the standard definition (SDTV) screen. The monitors and television screens that used the CRT tube have a screen that consists of rows arranged horizontally through a screen that was vertically calculated from top to bottom, and thus were referred to as vertical resolution. The images displayed on this type of screen were created by an "electron gun" that caused the images to appear on each pixel of the screen at once. Each line that was displayed was referred to as a scanning line, although the process was usually too fast for a person's perception. These lines are calculated to determine the vertical resolution of such a screen; SDTV usually has about 525 with 480 Visible Lines. Each of these lines is referred to as a scan line. The screen on the screen is created pixels of each line that are correctElectrons that move from the fiber called the "electron weapon" at the back of the monitor or the TV set towards the screen.

Scan line refers to each line of pixels that are illuminated from top to bottom and usually from left to right. This process is so fast that the human eye and brain usually do not recognize a number of scans as individual processes, because each complete scan of the screen on a progressive scan or monitor usually occurs between 30 and 60 times per second. There are two different ways that each scanning line on the screen can be illuminated or scanned, referred to as interlaced and progressive scanning.

The scanning of the interleaving occurs when each other scan line on the screen is displayed together. This is usually done with the odd number of the odd number and then with even numbered rows. The human brain and the eye do not lift on it because ofBirds of 30 to 60 frames per second are divided into two, so two sets of images occur 30 to 60 times per second. The persistence of vision effectively combines two sets of scanned images on a complete screen. Unlike the progressive scanning, the scanning of each line of the picture every time the screen is scanned.

The interlaced screens are marked with a small "i", while progressive screens are marked with a small "P". The number that usually accompanies this letter indicates the number of scan lines for a particular monitor or screen. SDTV usually has 480 lines and would be marked as 480i or 480p. While high -resolution television (HDTV) does not use the scanning line in the same way as the CRT screen, the number of pixels lines is still used to indicate screen resolution such as 720i or 1080p.