Introduction to HD

Introduction to the concept of "resolution"

In our everyday language we used to talk about the definition of a photograph or a digital image, referring to the degree of sharpness with which to display its details. The same goes for the video, but to understand in depth the concept, is necessary before learning, as a video image sequence plays that way.

The foundation of any audiovisual production is down to the fact you play a certain number of consecutive still images, fast enough for our own eye is not able to identify the images as individual but as a whole in motion. In order to "trick" our eye was found to be sufficient to give that sense of continuity of individual images, to reproduce more than 15 images a second.

Upon discovering that the human eye could detect light fluctuations from one image to the next, it was decided to reproduce the same image twice in the same time, dividing its contents into two sub-images (also called "image fields"), ie divide each image into a specified number of lines (horizontal resolution) and plasma, first all the odd lines of an image and then the even lines. We're talking about interlaced scanning.

Currently, and after elaborate process of normalization, our television (in Europe) play a total of 25 frames per second and, therefore, 50 fields per second (odd field, comprising the odd lines of an image, and even field formed by pairs lines). The standard video resolution is 576 horizontal lines.

What is HD?

From the above explanation we can begin to get an idea of ​​what high definition will: increase the number of lines of each of the images that form a video.

If most of our TV resolutions of 576i now playing (576 horizontal lines, so interlaced) high-definition TVs (with the distinctive "HD Ready") can play 720p resolutions (720 horizontal lines progressively, not interlaced) and 1080i (1080 horizontal lines per image, so interlaced).

We began to hear talk about the full high definition (Full HD or True HD) it goes a little further: it plays 1080p, which are images with 1080 horizontal lines in progressive mode, ie without dividing into two subimages .

Progressive scanning, compared with the intertwined that plays 50 "half images" per second, is able to play 50 full frames per second, so eliminating any sense of flicker and doubles the number of reproduced images per second.

Can we see high definition?

Of course, to see video footage of high-definition televisions will need to have ability to reproduce. As discussed in this article are those with distinctive Full HD or HD Ready on their screens.

Then it will be necessary to test them, to have players capable of playing video productions in HD. The most popular are the HD DVD and Blu-Ray. Both systems have been developed by leading electronics manufacturers worldwide and are completely incompatible with each other.

Some of the newer players, game consoles incorporate high-definition video.

In the video production workshop Audiovisual always work according to the needs of our client, with the newest technology and the utmost professionalism. Of course we have the necessary equipment for audiovisual productions in high definition, our client whenever appropriate.