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Pixel World

Pixel World

Pixel:
The minute area of illumination on display screen, one of many image is composed.

Usage:
Taking an example,Camera captures the data, line to line from top to bottom in a single click. In projection, cathode ray tube fires the electrons according by line to line from top to bottom on pixel elements. Each pixel elements contributes to final image.

Projection:
In present generation, we have different pixel sizes like 1080p, 720p.Here the pixels are formatted like width x height with the units in pixels.eg: 1920 × 1080.In the example 1920 pixels in width and 1080 pixels in height to the total screen.
  1.  If we have less count of pixels i.e., screen resolution, projection of the image on the screen will distribute to only those number of pixels.

Taking an example, we have a screen with 4 pixels. The projection of image need to be distributed to only 4 pixels, leads to less quality of image.
  1.        If the screen resolution has high count, projection of image on the screen will distribute to many pixels and high quality of image.




Megapixel vs. HD
One could consider HD a subset of megapixel.  HD is defined by specific resolutions at specific frame rates with a specific aspect ratio. Any camera with a resolution of more than a million pixels is by definition a megapixel camera. The lowest resolution in the megapixel range in the security market is around 1.3 megapixels, which provides 1,280 x 1,024-pixel resolution (or 1.3 million pixels), to resolutions as high as 10 megapixels (3,648 x 2,752 pixels). The range of megapixel cameras continues to expand to accommodate various application requirements.


HD refers to cameras with a standardized resolution of 720p or 1,080p. The numbers 720 and 1,080 refer to the horizontal resolution. Therefore, 720p HD camera resolution provides images that are 1,280 x 720 pixels (921,600 pixels — not megapixel), and 1,080p HD cameras provide 1,920 x 1,080-pixel resolution, or 2.1 megapixels. The HD video format also uses an aspect ratio of 16:9 (rather than 5:4 or 4:3), and the frame rate is standardized at 60, 50, 30 or 25 frames per second (fps) (depending on your TV).
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