Introduction to the concept of all resolution are familiar with digital photography. We bought 5 and 10 megapixel cameras, and note with satisfaction that more pixels, larger can make the photo, extending it up to size poster. The same happens with the audiovisual world. For more than 50 years, the world audiovisual legislation has established that the video has a 0.4 megapixel resolution. And just as was the case with the older cameras, the size of the image could not be very large. This was valid for old TVs tube, usually small, that have populated our homes in recent decades. But modern technology has led to the emergence of new and modern LCDs and plasma TVs with a size never seen before.
Thus, huge screens 37-inch, 42-inch and up to 47 inches are common in the electronics stores. But the video, with its modest 0.4 megapixels of resolution, not hold well be displayed on big TVs, as well as a photograph of 1 megapixel not endure well too big enlargement. And here is where comes in the idea of change video system, modernise it and adapt it to the new TVs and dissemination systems. What is high definition? High definition is the modernization of the international system of video. Basically, going to have a resolution or quality of 0.4 megapixels, 2 megapixels. Perhaps it may not seem too increase, bearing in mind that photos cameras arrive at much higher resolutions, but must be taken into account that the video moves 25 images per second.
Thus, the size of a video image goes from approximately 800 600 pixels (the current system) to 2,000 x1.000 pixels. It is the famous Full HD; 1,000 lines of resolution. It should be noted that it has also defined an intermediate system, with a resolution of 1 megapixel. (1400 x 800 pixels, aprox.) Also, new resolutions and higher, up to 4 megapixel image sizes, is already studying although it is unlikely to see the light in the domestic market, since it is necessary to have suitable equipment to enjoy high definition.