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.
- 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.
- 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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