diff --git a/projects/evaluation.tex b/projects/evaluation.tex
index d3957dc..7b8b7af 100644
--- a/projects/evaluation.tex
+++ b/projects/evaluation.tex
@@ -1,10 +1,10 @@
-\documentclass[12pt,a4paper,landscape]{article}
+\documentclass[10pt,a4paper,landscape]{article}
\usepackage{pslatex}
\usepackage{graphics}
%%%%% page style %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-\usepackage[left=10mm,right=10mm,top=10mm,bottom=10mm,headsep=0ex,headheight=0ex,footskip=0ex]{geometry}
+\usepackage[left=5mm,right=5mm,top=10mm,bottom=10mm,headsep=0ex,headheight=0ex,footskip=0ex]{geometry}
\pagestyle{empty}
\newcommand{\rot}[1]{\rotatebox{90}{#1}\,\,}
@@ -17,38 +17,40 @@
\begin{document}
\sffamily
-\section*{Scientific computing WS18/19}
+\section*{Scientific computing WS\,20/21: Project score sheet}
\noindent
-\begin{tabular}{|p{0.16\textwidth}|p{0.1\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|l|l|}
+\begin{tabular}{|p{0.15\textwidth}|p{0.10\textwidth}|p{0.02\textwidth}|p{0.02\textwidth}|p{0.02\textwidth}|p{0.02\textwidth}|p{0.02\textwidth}|p{0.02\textwidth}|p{0.02\textwidth}|p{0.019\textwidth}|p{0.02\textwidth}|p{0.02\textwidth}|p{0.02\textwidth}|p{0.018\textwidth}|p{0.02\textwidth}|p{0.02\textwidth}|p{0.02\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.02\textwidth}|l|l|}
\hline
-Name & Project & \multicolumn{5}{l|}{Project} & \multicolumn{3}{l|}{Figures} & \multicolumn{8}{l|}{Code} & Sum & Grade \rule{0.pt}{3ex} \\
- & & \rot{Understanding} & \rot{Presentation}\rot{Structure, didactics} & \rot{Completed} & \rot{Bonus:}\rot{Context} & \rot{Own ideas} & \rot{Readability}\rot{font size, etc.} & \rot{Labels, units, and}\rot{statistical measures} & \rot{Design} & \rot{Runs} & \rot{Names of}\rot{vars and funcs} & \rot{Style: white space}\rot{Spaghetti, structure} & \rot{Functions: used,}\rot{purpose, standalone} & \rot{Docu script} & \rot{Docu functions} & \rot{Figures saved} & \rot{Bonus:}\rot{Interesting code} & & \\
- & & 0--6 & 0--2 & 0--2 & 0, 1 & 0--2 & 0--2 & 0--2 & 0--2 & 0--2 & 0--2 & 0--2 & 0--3 & 0--2 & 0--2 & 0, 2 & 0--2 & 33 & \\ \hline
- \num & & & & & & & & & & & & & & & & & & & \\ \hline
- \num & & & & & & & & & & & & & & & & & & & \\ \hline
- \num & & & & & & & & & & & & & & & & & & & \\ \hline
- \num & & & & & & & & & & & & & & & & & & & \\ \hline
- \num & & & & & & & & & & & & & & & & & & & \\ \hline
- \num & & & & & & & & & & & & & & & & & & & \\ \hline
- \num & & & & & & & & & & & & & & & & & & & \\ \hline
- \num & & & & & & & & & & & & & & & & & & & \\ \hline
+Name & Project & \multicolumn{3}{l|}{Project} & \multicolumn{3}{l|}{Figures$^1$} & \multicolumn{3}{l|}{Code} & \multicolumn{7}{l|}{Codestyle (7P)$^2$} & \multicolumn{2}{l|}{Documentation} & Sum & Grade \rule{0.pt}{3ex} \\
+ & & \rot{Completed} & \rot{Presentation}\rot{Structure, didactics} & \rot{Bonus:}\rot{Context \& own ideas} & \rot{Readability}\rot{font size, etc.} & \rot{Labels, units, and}\rot{statistical measures} & \rot{Consitent design, size,}\rot{layout, color code} & \rot{Runs} & \rot{Figures saved} & \rot{Bonus:}\rot{Interesting code} & \rot{Inconsitent naming}\rot{of files \& functions} & \rot{Inconsistent naming}\rot{of variables} & \rot{Inconsistent use of}\rot{whitespace/empty lines} & \rot{Spaghetti code} & \rot{Non-modularized}\rot{code}& \rot{Mixed function}\rot{purpose}& \rot{Functions are not}\rot{standalone} & \rot{Main script} & \rot{Functions: purpose, }\rot{argument type \& shape,}\rot{function usage} & & \\
+ & & 0--4 & 0--4 & 0--2 & 0--2 & 0--3 & 0--3 & 0--2 & 0, 1 & 0--2 & -1 & -1 & -1 & -1 & -1 & -1 & -1 & 0--1 & 0--3 & 30 & \\ \hline
+ \num & & & & & & & & & & & & & & & & & & & & & \\ \hline
+ \num & & & & & & & & & & & & & & & & & & & & & \\ \hline
+ \num & & & & & & & & & & & & & & & & & & & & & \\ \hline
+ \num & & & & & & & & & & & & & & & & & & & & & \\ \hline
+ \num & & & & & & & & & & & & & & & & & & & & & \\ \hline
+ \num & & & & & & & & & & & & & & & & & & & & & \\ \hline
+ \num & & & & & & & & & & & & & & & & & & & & & \\ \hline
+ \num & & & & & & & & & & & & & & & & & & & & & \\ \hline
\end{tabular}
+$^1$ see chapter 3: \emph{Graphical representation of scientific data}; $^2$ see chapter 4: \emph{Code style} for more information
+
\noindent
-\begin{tabular}{|p{0.16\textwidth}|p{0.1\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|l|l|}
+\begin{tabular}{|p{0.15\textwidth}|p{0.10\textwidth}|p{0.02\textwidth}|p{0.02\textwidth}|p{0.02\textwidth}|p{0.02\textwidth}|p{0.02\textwidth}|p{0.02\textwidth}|p{0.02\textwidth}|p{0.019\textwidth}|p{0.02\textwidth}|p{0.02\textwidth}|p{0.02\textwidth}|p{0.018\textwidth}|p{0.02\textwidth}|p{0.02\textwidth}|p{0.02\textwidth}|p{0.024\textwidth}|p{0.024\textwidth}|p{0.02\textwidth}|l|l|}
\hline
-Name & Project & \multicolumn{5}{l|}{Project} & \multicolumn{3}{l|}{Figures} & \multicolumn{8}{l|}{Code} & Sum & Grade \rule{0.pt}{3ex} \\
- & & \rot{Understanding} & \rot{Presentation}\rot{Structure, didactics} & \rot{Completed} & \rot{Bonus:}\rot{Context} & \rot{Own ideas} & \rot{Readability}\rot{font size, etc.} & \rot{Labels, units, and}\rot{statistical measures} & \rot{Design} & \rot{Runs} & \rot{Names of}\rot{vars and funcs} & \rot{Style: white space}\rot{Spaghetti, structure} & \rot{Functions: used,}\rot{purpose, standalone} & \rot{Docu script} & \rot{Docu functions} & \rot{Figures saved} & \rot{Bonus:}\rot{Interesting code} & & \\
- & & 0--6 & 0--2 & 0--2 & 0, 1 & 0--2 & 0--2 & 0--2 & 0--2 & 0--2 & 0--2 & 0--2 & 0--3 & 0--2 & 0--2 & 0, 2 & 0--2 & 33 & \\ \hline
- \num & & & & & & & & & & & & & & & & & & & \\ \hline
- \num & & & & & & & & & & & & & & & & & & & \\ \hline
- \num & & & & & & & & & & & & & & & & & & & \\ \hline
- \num & & & & & & & & & & & & & & & & & & & \\ \hline
- \num & & & & & & & & & & & & & & & & & & & \\ \hline
- \num & & & & & & & & & & & & & & & & & & & \\ \hline
- \num & & & & & & & & & & & & & & & & & & & \\ \hline
- \num & & & & & & & & & & & & & & & & & & & \\ \hline
+Name & Project & \multicolumn{3}{l|}{Project} & \multicolumn{3}{l|}{Figures$^1$} & \multicolumn{3}{l|}{Code} & \multicolumn{7}{l|}{Codestyle (7P)$^2$} & \multicolumn{2}{l|}{Documentation} & Sum & Grade \rule{0.pt}{3ex} \\
+ & & \rot{Completed} & \rot{Presentation}\rot{Structure, didactics} & \rot{Bonus:}\rot{Context \& own ideas} & \rot{Readability}\rot{font size, etc.} & \rot{Labels, units, and}\rot{statistical measures} & \rot{Consitent design, size,}\rot{layout, color code} & \rot{Runs} & \rot{Figures saved} & \rot{Bonus:}\rot{Interesting code} & \rot{Inconsitent naming}\rot{of files \& functions} & \rot{Inconsistent naming}\rot{of variables} & \rot{Inconsistent use of}\rot{whitespace/empty lines} & \rot{Spaghetti code} & \rot{Non-modularized}\rot{code}& \rot{Mixed function}\rot{purpose}& \rot{Functions are not}\rot{standalone} & \rot{Main script} & \rot{Functions: purpose, }\rot{argument type \& shape,}\rot{function usage} & & \\
+ & & 0--4 & 0--4 & 0--2 & 0--2 & 0--3 & 0--3 & 0--2 & 0, 1 & 0--2 & -1 & -1 & -1 & -1 & -1 & -1 & -1 & 0--1 & 0--3 & 30 & \\ \hline
+ \num & & & & & & & & & & & & & & & & & & & & & \\ \hline
+ \num & & & & & & & & & & & & & & & & & & & & & \\ \hline
+ \num & & & & & & & & & & & & & & & & & & & & & \\ \hline
+ \num & & & & & & & & & & & & & & & & & & & & & \\ \hline
+ \num & & & & & & & & & & & & & & & & & & & & & \\ \hline
+ \num & & & & & & & & & & & & & & & & & & & & & \\ \hline
+ \num & & & & & & & & & & & & & & & & & & & & & \\ \hline
+ \num & & & & & & & & & & & & & & & & & & & & & \\ \hline
\end{tabular}
-
+$^1$ see chapter 3: \emph{Graphical representation of scientific data}; $^2$ see chapter 4: \emph{Code style} for more information
\end{document}
diff --git a/projects/project_eyetracker/data/Genesis_VIII.png b/projects/project_eyetracker/data/Genesis_VIII.png
new file mode 100644
index 0000000..d8add1a
Binary files /dev/null and b/projects/project_eyetracker/data/Genesis_VIII.png differ
diff --git a/projects/project_eyetracker/data/Genesis_XXXIX.png b/projects/project_eyetracker/data/Genesis_XXXIX.png
new file mode 100644
index 0000000..cf25c64
Binary files /dev/null and b/projects/project_eyetracker/data/Genesis_XXXIX.png differ
diff --git a/projects/project_eyetracker/data/export_data.py b/projects/project_eyetracker/data/export_data.py
new file mode 100644
index 0000000..9af699e
--- /dev/null
+++ b/projects/project_eyetracker/data/export_data.py
@@ -0,0 +1,29 @@
+import numpy as np
+import scipy.io as sp
+from IPython import embed
+
+
+with open('corsi_VP19_eyedata.log') as f:
+ lines = f.readlines()
+
+ eye_found = np.zeros((len(lines)-7,1))
+ gaze_x = np.zeros(eye_found.shape)
+ gaze_y = np.zeros(eye_found.shape)
+ frame_time = np.zeros(eye_found.shape)
+ marker_time = np.zeros(eye_found.shape)
+ marker_count = np.zeros(eye_found.shape)
+
+ for i in range(7,len(lines)):
+ line = lines[i].strip().split()
+ eye_found[i-7] = line[1]
+ gaze_x[i-7] = line[2]
+ gaze_y[i-7] = line[3]
+ frame_time[i-7] = line[10]
+ marker_time[i-7] = line[11]
+ marker_count[i-7] = line[9]
+ to_be_stored = {'eye_found': eye_found, 'gaze_x':gaze_x, 'gaze_y':gaze_y,
+ 'frame_time':frame_time, 'marker_time':marker_time,
+ 'marker_count':marker_count}
+
+ sp.savemat('eye_tracking.mat', to_be_stored)
+
diff --git a/projects/project_eyetracker/data/eye_tracking.mat b/projects/project_eyetracker/data/eye_tracking.mat
deleted file mode 100644
index 9aef1ba..0000000
Binary files a/projects/project_eyetracker/data/eye_tracking.mat and /dev/null differ
diff --git a/projects/project_eyetracker/data/log_to_mat.py b/projects/project_eyetracker/data/log_to_mat.py
new file mode 100644
index 0000000..530b647
--- /dev/null
+++ b/projects/project_eyetracker/data/log_to_mat.py
@@ -0,0 +1,39 @@
+import numpy as np
+import scipy.io as spio
+import glob
+import os
+
+def export_file(filename):
+ frame_idx = []
+ eye_found = []
+ gaze_x = []
+ gaze_y = []
+ marker = []
+ with open(filename, "r") as f:
+ for i, line in enumerate(f):
+ if i < 7:
+ continue
+ parts = line.strip().split()
+ frame_idx.append(int(parts[0]))
+ eye_found.append(int(parts[1]))
+ gaze_x.append(int(parts[2]))
+ gaze_y.append(int(parts[3]))
+ marker.append(int(parts[-4]))
+
+ frame_idx = np.array(frame_idx)
+ eye_found = np.array(eye_found)
+ gaze_x = np.array(gaze_x)
+ gaze_y = np.array(gaze_y)
+ marker = np.array(marker)
+ to_be_stored = {'eye_found': eye_found, 'gaze_x':gaze_x, 'gaze_y':gaze_y,
+ 'frame_index':frame_idx, 'marker':marker}
+ outfile = filename.split(os.sep)[-1].split(".")[0] + ".mat"
+ spio.savemat(outfile, to_be_stored)
+
+
+files = sorted(glob.glob(os.path.join(".", "*.log")))
+
+for f in files:
+ print("exporting: ", f)
+ export_file(f)
+
diff --git a/projects/project_eyetracker/eyetracker.fdb_latexmk b/projects/project_eyetracker/eyetracker.fdb_latexmk
new file mode 100644
index 0000000..e7dc4c3
--- /dev/null
+++ b/projects/project_eyetracker/eyetracker.fdb_latexmk
@@ -0,0 +1,121 @@
+# Fdb version 3
+["pdflatex"] 1612006735 "/Users/jan/teaching/scicomp_projects/project_eyetracker/eyetracker.tex" "/Users/jan/teaching/scicomp_projects/project_eyetracker/eyetracker.pdf" "eyetracker" 1612006736
+ "../header.tex" 1611822933 1721 b4b359c75ebca4237084c34779ee2a8a ""
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diff --git a/projects/project_eyetracker/eyetracker.synctex.gz b/projects/project_eyetracker/eyetracker.synctex.gz
new file mode 100644
index 0000000..dfc3741
Binary files /dev/null and b/projects/project_eyetracker/eyetracker.synctex.gz differ
diff --git a/projects/project_eyetracker/eyetracker.tex b/projects/project_eyetracker/eyetracker.tex
index 017c368..66e7e20 100644
--- a/projects/project_eyetracker/eyetracker.tex
+++ b/projects/project_eyetracker/eyetracker.tex
@@ -2,8 +2,8 @@
\newcommand{\ptitle}{Eye tracker}
\input{../header.tex}
-\firstpagefooter{Supervisor: Jan Grewe}{phone: 29 74588}%
-{email: jan.grewe@uni-tuebingen.de}
+\firstpagefooter{Supervisor: Lukas Sonnenberg}{phone:}%
+{email: lukas.sonnenberg@uni-tuebingen.de}
\begin{document}
@@ -12,33 +12,30 @@
%%%%%%%%%%%%%% Questions %%%%%%%%%%%%%%%%%%%%%%%%%
\section*{Analysis of eye trajectories.}
-In this project you will analyse eye-tracking data (courtesy of the
-Mallot department). In this task the subject had to memorize the
-positions of targets that can be only learned with active gaze
-shifts. The eye movements during training and test are recorded.
+In this project you will analyze eye-tracking data (courtesy of Gregor Hardiess,
+Cognitive Neuroscience, Uni-T\"ubingen). In this task subjects were viewing
+biblical images while their eye movements were recorded.
+
+In the accompanying datasets you find a subject's eye tracking data when viewing two different images
+(\emph{Genesis\_VIII.png} and \emph{Genesis\_XXXIX.png}, files \verb+1_1.mat+ and \verb+1_2.mat+, respectively). Each \verb+mat+-file contains five variables: \verb+frame_index+, the \verb+gaze_x+ and \verb+gaze_y+ position (in pixel on the screen), a boolean vector \verb+eye_found+ telling whether the tracker could actually estimate the eye position, and a vector \verb+marker+. The \verb+marker+ is used to indicate sections in the data. 0 can be ignored, 1 marks the fixation period and 2 indicates the acutal trial.
+The screen was 37.6\,cm wide and 30.1\,cm high and had a resolution of 1280\,x\,1024\,pixel. The distance between subject's eyes and the screen was 50\,cm.
+The eyetracker recorded ey positions with 60\,Hz. The fixation point was shown at the center of the screen and can be used to compensate for possible offests in the \verb+gaze_x+ and \verb+gaze_y+ positions.
\begin{questions}
- \question In the accompanying dataset you find six variables. (i)
- \textit{eye\_found} a logical array indicating whether the eye was
- found by the tracker. (ii, iii) \textit{gaze\_x} and
- \textit{gaze\_y} containing the x- and y-position of the gaze. They
- relate to a screen with 1280x1024 pixel resolution. (iv)
- \textit{frame\_time} containing time stamps for each frame. (v)
- \textit{marker\_time} containing the time of the last marker. (vi)
- \textit{marker\_count} the count of the markers. All entries with
- the same marker belong to the same trial.
+ \question Familiarize yourself with the data.
\begin{parts}
- \part Cut the data in chunks belonging to the same trial.
- \part Characterize the eye movements statistically, e.g. with eye
- speed and/or accelerations.
- \part Detect and correct the eye traces for instances in which the
- eye was not correctly detected. Interpolate linearily in these sections.
- \part Create a 'heatmap' plot of the eye-positions
- for one or two (nice) trials.
- \part Use the \verb+kmeans+ clustering function to
- identify fixation points. Manually select a good number of cluster
- centroids.
+ \part Cut the data in chunks belonging to the same period (fixation and free eye-movements).
+ \part Detect problems in the data (e.g. the eye was not found) and correct the eye traces. Interpolate linearily in these sections.
+ \end{parts}
+
+ \question Characterize the eye movements statistically.
+ \begin{parts}
+ \part Calculate with eye speed and/or accelerations.
+ \part Create a 'heatmap' plot of the eye-positions.
+ \part Detect fixation points in the "free movement" part of the data.
\end{parts}
+
+ \question Compare the subject's behaviour when viewing the different scenes.
\end{questions}
\end{document}
diff --git a/projects/project_eyetracker/solution/convert_indices_to_time.m b/projects/project_eyetracker/solution/convert_indices_to_time.m
new file mode 100644
index 0000000..7171bd6
--- /dev/null
+++ b/projects/project_eyetracker/solution/convert_indices_to_time.m
@@ -0,0 +1,15 @@
+function [time] = convert_indices_to_time(indices, framerate)
+% [time] = convert_indices_to_time(indices, frame_rate)
+%
+% Converts the vector of frame indices to time. The time vector will start
+% at zero.
+%
+% Arguments:
+% indices: vecor, the frame indices
+% framerate:, scalar, the framerate in Hz
+%
+% Returns:
+% time: vector, the time vector
+
+indices = indices - indices(1);
+time = indices / framerate;
\ No newline at end of file
diff --git a/projects/project_eyetracker/solution/convert_pixel_to_meter.m b/projects/project_eyetracker/solution/convert_pixel_to_meter.m
new file mode 100644
index 0000000..148b8d0
--- /dev/null
+++ b/projects/project_eyetracker/solution/convert_pixel_to_meter.m
@@ -0,0 +1,7 @@
+function [x, y] = convert_pixel_to_meter(x_pos, y_pos, width_m, height_m, width_pixel, height_pixel)
+
+x_resolution = width_m/width_pixel;
+y_resolution = height_m/height_pixel;
+
+x = x_pos * x_resolution;
+y = y_pos * y_resolution;
\ No newline at end of file
diff --git a/projects/project_eyetracker/solution/correct_eye_positions.m b/projects/project_eyetracker/solution/correct_eye_positions.m
new file mode 100644
index 0000000..5a4860c
--- /dev/null
+++ b/projects/project_eyetracker/solution/correct_eye_positions.m
@@ -0,0 +1,17 @@
+function [true_x, true_y] = correct_eye_positions(eye_x, eye_y, x_offset, y_offset)
+% [true_x, true_y] = correct_eye_positions(eye_x, eye_y, x_offset, y_offset)
+%
+% Applies the measured offset between x- and y- fixation coordinates to
+% correct the recorded x- and y- eye coordinates.
+%
+% Arguments:
+% eye_x, eye_y: vector, the recorded x- and y-eye positions.
+% x_offset, y_offset: scalar, the x- and y-offset between
+% fixation point and eye position during fixation.
+%
+% Returns:
+% true_x, true_y: vector, the corrected eye positions
+
+
+true_x = eye_x + x_offset;
+true_y = eye_y + y_offset;
\ No newline at end of file
diff --git a/projects/project_eyetracker/solution/fix_eye_lost.m b/projects/project_eyetracker/solution/fix_eye_lost.m
new file mode 100644
index 0000000..e07f527
--- /dev/null
+++ b/projects/project_eyetracker/solution/fix_eye_lost.m
@@ -0,0 +1,22 @@
+function [new_x, new_y] = fix_eye_lost(x, y, frame_index, eye_found)
+% [new_x, new_y] = fix_eye_lost(x, y, frame_index, eye_found)
+%
+% Fixes intervals in the data in which eye detection was lost. Function uses linear interpolation.
+%
+% Arguments:
+% x, y: vector, the eye positions
+% frame_indices: vector, same length as x and y, the frame
+% indices (or times)
+% eye_found: vector, ones and zeros indicate whether the eye was
+% reliably found by the tracker or not.
+%
+% Returns:
+% new_x, new_y: vectors of double, the new positions
+
+valid_x_positions = double(x(eye_found == 1));
+valid_y_positions = double(y(eye_found == 1));
+
+valid_frame_indices = double(frame_index(eye_found == 1));
+
+new_x = interp1(valid_frame_indices, valid_x_positions, double(frame_index));
+new_y = interp1(valid_frame_indices, valid_y_positions, double(frame_index));
diff --git a/projects/project_eyetracker/solution/get_fixation_offset.m b/projects/project_eyetracker/solution/get_fixation_offset.m
new file mode 100644
index 0000000..a263275
--- /dev/null
+++ b/projects/project_eyetracker/solution/get_fixation_offset.m
@@ -0,0 +1,20 @@
+function [x_offset, y_offset] = get_fixation_offset(eye_x, eye_y, event_marker, fixation_event_marker, fixation_x, fixation_y)
+% [x_offset, y_offset] = get_fixation_offset(eye_x_pos, eye_y_pos, event_marker, fixation_event_marker, fixation_x, fixation_y)
+%
+% Estimates the x, and y-offset between screen position and reported eye position while fixating
+%
+% Arguments:
+% eye_x, eye_y: The eye positions reported by the tracker, vectors of coordinates
+% event_marker: vector, the recorded event markers
+% fixation_event_marker: scalar, the event marker that represents the fixation period
+% fixation_x, fixation_y: scalar, the x and y position of the fixation cross on the screen
+%
+% Returns:
+% x_offset, y_offset: scalar the deviation between reported x
+% and y positions and the true positions.
+
+eye_fixation_x_pos = median(eye_x(event_marker == fixation_event_marker));
+eye_fixation_y_pos = median(eye_y(event_marker == fixation_event_marker));
+
+x_offset = fixation_x - eye_fixation_x_pos;
+y_offset = fixation_y - eye_fixation_y_pos;
diff --git a/projects/project_eyetracker/solution/load_eye_tracking_data.m b/projects/project_eyetracker/solution/load_eye_tracking_data.m
new file mode 100644
index 0000000..48df855
--- /dev/null
+++ b/projects/project_eyetracker/solution/load_eye_tracking_data.m
@@ -0,0 +1,21 @@
+function [frame_index, gaze_x, gaze_y, marker, eye_found] = load_eye_tracking_data(filename)
+% [frame_index, gaze_x, gaze_y, marker, eye_found] = load_eye_tracking_data(filename)
+%
+% Loads the eyetracking data stored in the specified file. Raises an error,
+% if the file was not found.
+%
+% Arguments:
+% filename: string, the path to the data file
+%
+% Returns:
+% frame_index: vector, the recorded frame numbers
+% gaze_x, gaze_y: vector, the recorded x and y eye positions
+% marker: vector, the recorded event marker
+% eye_found: vector, 1, or zero values indicating whether or not
+% the eye was actually detected by the tracker.
+
+if exist(filename, "file") ~= 2
+ error("file %s does not exist or is no mat file", filename);
+end
+
+load(filename, "gaze_x", "gaze_y", "frame_index", "marker", "eye_found")
\ No newline at end of file
diff --git a/projects/project_eyetracker/solution/main.m b/projects/project_eyetracker/solution/main.m
new file mode 100644
index 0000000..217840f
--- /dev/null
+++ b/projects/project_eyetracker/solution/main.m
@@ -0,0 +1,35 @@
+% Project Eyetracking
+% Name: John Doe
+% Matrikelnummer: 123456789
+clear
+close all
+
+%% Definition of constants
+framerate = 60; % Hz
+screen_width = 0.376; % m
+screen_height = 0.301; % m
+screen_resolution_x = 1280; % pixel
+screen_resolution_y = 1024; % pixel
+fixation_x = screen_resolution_x/2; % position of fixation cross on screen
+fixation_y = screen_resolution_y/2; % position of fixation cross on screen
+fixation_marker = 1; % event marker for fixtion period
+movement_marker = 2; % event marker for free movement period
+
+data_files = [fullfile("..", "data", "1_1.mat"), fullfile("..", "data", "1_5.mat")];
+scenes = [fullfile("..", "data", "Genesis_VIII.png"), fullfile("..", "data", "Genesis_XXXIX.png")];
+
+%% Process files
+for i = 1:length(data_files)
+ file = data_files(i);
+ scene = scenes(i);
+
+ fprintf("processing: %s\n", file)
+ [frame_indices, x, y, event_marker, eye_found] = load_eye_tracking_data(file);
+ [x_offset, y_offset] = get_fixation_offset(x, y, event_marker, fixation_marker, fixation_x, fixation_y);
+ [true_x, true_y] = correct_eye_positions(x, y, x_offset, y_offset);
+ [true_x, true_y] = fix_eye_lost(true_x, true_y, frame_indices, eye_found);
+ time = convert_indices_to_time(frame_indices, framerate);
+
+ fig = plot_image_position_overlay(true_x, true_y, time, scene);
+ saveas(fig, sprintf("test_%i", i), "pdf")
+end
\ No newline at end of file
diff --git a/projects/project_eyetracker/solution/plot_image_position_overlay.m b/projects/project_eyetracker/solution/plot_image_position_overlay.m
new file mode 100644
index 0000000..6004eff
--- /dev/null
+++ b/projects/project_eyetracker/solution/plot_image_position_overlay.m
@@ -0,0 +1,20 @@
+function fig = plot_image_position_overlay(x, y, time, image)
+
+if length(x) ~= length(y) || length(y) ~= length(time)
+ error("Length of vectors x, y, and time does not match!");
+end
+if ~exist(image, "file")
+ error("Image %s could not be found!", image);
+end
+
+fig = figure();
+imshow(image)
+hold on
+scatter(x, y, [], time)
+c = colorbar();
+
+fig.PaperSize = [10.0, 10.0];
+fig.PaperPosition = [0., 0., 10.0, 10.0];
+c.Label.String = "time [s]";
+c.Label.FontSize = 9;
+