frame buffer and video basics

Frame buffer:

• Frame buffer is a special area of memory in raster displays which is dedicated to graphics.
• It holds the set of intensity values for all the screen points.
• The stored intensity values are retrieved from frame buffer and displayed on the screen one row (scanline) at the time.
• Each screen point is referred to as a pixel or pel(shortened forms of picture element).
• Each pixel on the screen can be specified by its row and column number. Thus, by specifying row and column number we can specify the pixel position on the screen.

Video basics :

• Video or moving image in general, is created from a sequence of small images called frames.
• By recording and then playing back frames in quick succession, an illusion of movement is created.
• Video can be edited by removing some frames and combining sequences of frames, called clips, together in a timeline.

Pixel :-

The pixel (a word invented from "picture element") is the basic unit of programmable color on a computer display or in a computer image.

Aspect ratio :-

Aspect ratio is the ratio between height and width of an image. A colon is used to separate two numbers. Different images on different screens have a different ratio.

Common aspect ratio is as follows:

1.33:1, 1.37:1, 1.43:1, 1.50:1, 1.56:1, 1.66:1, 1.75:1, 1.78:1, 1.85:1, 2.00:1, e.t.c

Resolution :-

In pixel resolution, the term resolution refers to the total number of pixels in a digital image. If an image has M rows and N columns then a resolution is defined as M X N. The quality of the image depends on the pixel resolution.