**6.5 Parallax and depth adjustment**

The parallax is the corresponding distance on the plane of the image to the inter-ocular distance when visualizing a determined object. The effect over the objects differs in the capture of the images modifying the distance between the pair of cameras used to take the stereoscopic images.

Fig. 15. Scheme of parallax distance

Hyper-stereoscopy is a very characteristic effect in 3D images in which the observer appreciates the volume of the objects much closer to them. This effect is a consequence of modifying the parallax on the image. When separating the pair of cameras a distance higher than the average of the distances between human eyes. So, it could be a reality that the hyper-stereoscopy increases the quality of experience in users who are viewing this kind of images, but it is necessary to define a limit in which this effect stops being satisfying to the users.

The quality of experience increases but it is necessary to develop new studies to determine the limits of parallax in order to develop recommendations for contents creators and broadcasters.
