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@@ -8,10 +8,10 @@ the original algorithms that were developed for monitor based experiments.
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## 1. CONTENT
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Before starting using the provided algorithms of this repository you should
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-first clone (or download) the repository that offers utilities that allow as to
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-handle ARFF files from [here](https://github.com/IoAg/matlab_utils). We also
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-need to clone the repository that offers utilities for handling 360-degree
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-utilities from [here](https://github.com/IoAg/matlab_360_utils). Then add the
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+first clone (or download) the *matlab_utils* repository that offers utilities
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+for mainly handling ARFF files from [here](https://web.gin.g-node.org/ioannis.agtzidis/matlab_utils). We also
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+need to clone the *matlab_360_utils* repository that offers utilities for handling 360-degree
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+data from [here](https://web.gin.g-node.org/ioannis.agtzidis/matlab_360_utils). Then add the
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previous folders to the search path of Matlab with the *pathtool* or *addpath*
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commands.
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@@ -103,9 +103,16 @@ plain gaze recordings. We also make use of the "%@METADATA" special comments
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which describe the field of view of the used headset. Apart from the default
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metadata *width_px, height_px, distance_mm, width_mm, height_mm* we also use
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the extra metadata *fov_width_px, fov_width_deg, fov_height_px, fov_height_deg*
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-that describe the headset properties.
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+that describe the headset properties.
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-### 2.1. ARFF example
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+The "@attribute" *x* and *y* represent the gaze coordinates in the
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+equirectangular space (i.e. the head and eye position together). The
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+*x_head* and *y_head* attributes represent head coordinates in the
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+equirectangular space. The *angle_deg_head* attribute is equivalent to the roll
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+principal axis.
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+
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+
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+### 2.1 ARFF Example
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```
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@RELATION gaze_360
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@@ -152,6 +159,17 @@ that describe the headset properties.
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129000,956.00,537.00,1.00,960.00,540.00,1.27,saccade
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141000,948.00,530.00,1.00,960.00,540.00,1.28,saccade
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```
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+### 2.2 Recovery of HMD Pose
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+
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+The *x_head, y_head, angle_deg_head* allow us to recover the headset pose
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+because we use 360-degree equirectangular videos and therefore exist no
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+translations during video presentation. For
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+understanding the process take a look at functions
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+[HeadToVideoRot.m](https://web.gin.g-node.org/ioannis.agtzidis/matlab_360_utils/src/master/HeadToVideoRot.m) and
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+[YZXrotation.m](https://web.gin.g-node.org/ioannis.agtzidis/matlab_360_utils/src/master/YZXrotation.m)
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+in the
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+[matlab_360_utils](https://web.gin.g-node.org/ioannis.agtzidis/matlab_360_utils) repository.
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+
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## 3. GENERAL INFORMATION
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