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HD_UHD_Eyetracking_Videos 37 videos viewed in HD or in UHD with eyetracking data

Presentation & Goal

Presentation

UHD TV standard defines new video technologies as an increasing resolution from HD (1920x1080) to UHD, i.e. 4K (3840x2160). The emergence of UHD potentially provides a better immersion of the user thanks to a wider visual angle with appropriate larger screens. Indeed, ITU defines the optimal viewing distance as the distance at which scanning lines just cannot be perceived with visual acuity of 1'. It is thus set to 3H for HD and 1.5H for 4K-UHD where H is the height of the screen. This increase of resolution and stimulated visual angle can modify visual attention deployment and visual patterns of people looking at HD and UHD videos.

The experiment was conducted in a test environment set as a standard subjective quality test condition according to ITU-R BT.500. The HD display used was a 46'' Panasonic Full HD Vieta and the 4K display used was a 65'' Panasonic TX-L65WT600E. The viewing distance was 1.5H, i.e. 120 cm, in UHD and 3H, i.e. 170 cm, as recommended in ITU-R BT.1769.

In HD, 34 naive observers (17 males and 17 females) participated in this experiment and in UHD, 36 naive observers (18 males and 18 females). UHD and HD were assessed in two different sessions with different observers to avoid any effect of memorization.

We adopted a free-looking approach in these experiments. Sequences were randomized for each observer. They were 2 seconds spaced out. The whole test lasted approximately 25 minutes.

The dataset is composed of 37 native UHD high quality video sequences from seven content provider. In HD, the original sequences were downscaled with Lanczos-3 algorithm.

For each video sequence, gaze point, fixation and saccade data are provided.

The Eye-tracker

Because of the larger stimulated visual angle in UHD, observers can need to move more their head and eye tracking systems may not be  accurate enough at the edges of the screen. We developed a new setup to address this issue: the Eye Head Tracker (EHT).  EHT is a combination of the mobile SMI eye tracking glasses and of the head tracker OptiTrack ARENA.
We implemented an application which collects these two data in order to provide the gaze position in the screen plane.

Data usage

The main goal of this dataset is the comparison of visual attention and viewing behavior in HD and UHD.Different kind of analyses can be done: comparison of saliency through fixation density maps, impact of viewing conditions and resolution on distribution of gaze points and fixations, comparison of distribution of saccades, etc. Moreover, this dataset can be used to evaluate the performance of visual saliency models in HD and UHD, by comparing fixation density maps computed from acquired data with simulated saliency maps.

Futhermore, this dataset provides useful data for any researcher working on dynamic visual attention in videos (dynamic visual attention modelling, visual attention and quality of experience, saliency-based video compression, etc.).

The main qualities of the dataset are the large number of sources and observers compared to previously published video saliency database, as well as the high quality of professional videos.

Heat map of the same video in UHD and in HD