Canal+ will premiere in September the 3D concert by Alejandro Sanz

Channel+, with the technical means of Puntolapospo and Videoreport (Vértice 360), collected in 3D the two performances that Alejandro Sanz offered in Madrid within his Paradise tour. This is the first time in Spain that a 3D live concert occurs.

In September, Canal+ 3D will premiere Alejandro Sanz 3D, a three -dimensional musical show as a result of stereoscopic production made by Canal+ with technical means of Puntolapospo and Videoreport (Vértice 360 Group) in the two direct that the singer offered last May at the Palace of Sports of Madrid within its current Paradise tour. This ambitious work is the first time in Spain that a 3D live concert occurs.

To produce Alejandro Sanz 3D, Canal+ has made an important technical deployment with a 3D mobile unit with stereoscopy control that operates on 20 cameras implanted in various types of motorized rigs. These cameras are mounted on two hot heads, three cranes over fifty meters of travelling, two Steadycam ... all this is complemented by the sound record in Dolby 5.1 envelope to provide the viewer with a unique experience.

Production

3D recording demands the simulation of human vision to give the viewer the feeling of realism. This appearance of reality is achieved by capturing two very similar images with two cameras that are mounted on a special frame. To obtain a similar and constant separation between the two optics of the cameras, special systems are required that allow to reproduce exactly and in parallel all the optical adjustments of both chambers (panoramic and vertical movements, zoom, focus, colorimetry, luminosity, contrast, etc.).

The differences between the two images, as in the human brain, are the ones that will finally create the sensation of three -dimensionality. The more these differences are accentuated, the greater the stereoscopic effect that is obtained; On the other hand, the more the brain is done to integrate both images increases visual fatigue.

The coherence of both images facilitates the immersiveness of the viewer in the 3D experience.

Whether in the postproduction or live stage in a broadcast, there are specific tools to treat stereoscopic signals, either to reduce mismatches between the left and right signals, or to accentuate these differences more and create a more accused three -dimensional effect.

To visualize these two signals as a single stereoscopic 3D signal, some type of coding and a special screen prepared for 3D are required.

The live signals are transported from the mobile unit to the Canal+emission center, and from there to homes, multiplexed in a single HD signal in "Side by Side" format. This signal, shown on a conventional TV or monitor, appears as a vertically divided screen into two halves, in each of which the signal of an eye with the 16: 9 modified appearance ratio is shown to adapt them to the total size of the screen.

TVs prepared for 3D are responsible for decomposing this multiplexation and show the two overlapping signals full screen.

Depending on the technology used by the TV, the screen signal is projected towards the viewer by two beams of light with different polarization, or sequentially alternating the image of the right eye with that of the left. For the first case, glasses are required whose crystals filter respectively the beam with the correct polarization (passive glasses, which do not require electric power). In the case of sequential presentation of the left and right images, glasses are required whose crystals are obscured alternately by shutter synchronized with the image shown (active glasses). These systems involve a great improvement with respect to the Anaglifico 3D projection system that began to be used in the mid -twentieth century, and based on the separation of colors for each image.

Only those spectators that 3D TV and with the digital+ iplus terminal can follow this broadcast.