documentclass[a4paper,oneside,abstracton]{scrartcl}
usepackage[utf8]{inputenc}
usepackage[T1]{fontenc}                     %Schriftsatz Dokument
usepackage{lmodern}                         %use this package in combination with [T1]{fontenc} wo have vector-graphics letters instead of pixelated letters
usepackage[english]{babel}
usepackage{amsmath}
usepackage{amssymb}
usepackage{amsthm}
usepackage{amsfonts}
usepackage{amsbsy}
usepackage{latexsym}

begin{document}

...values is then taken, corresponding to the rules for
\
vspace{0.5cm}
begin{blockarray}{rc}
    begin{block}{rcRight{}}{= for odd number of frames textit{n}}
        odd number of frames $n$ : & pix$_frac{n+1}{2}$(x,y) \
        even number of frames $n$ : & $dfrac{1}{2}left(pix_frac{n}{2} + pix_{frac{n}{2}+1}right)$ \
    end{block}
end{blockarray}
\
begin{blockarray}{rc}
    begin{block}{rcRight{}}{= Master-textbf{Dark}[Bias]}}
        odd pixel values $n$ : & textbf{Dark}[Bias]$_frac{n+1}{2}$ \
        even pixel values $n$ : & $dfrac{1}{2}left(mathbf{Dark}mathrm{[Bias]}_frac{n}{2} + mathbf{Dark}mathrm{[Bias]}_{frac{n}{2}+1}right)$ \
    end{block}
    & \
    begin{block}{rcRight{}}{= Master-textbf{Dark}$_mathbf{Flat}$[Bias]}}
        odd pixel values $n$ : & textbf{Dark}$_mathbf{Flat}$[Bias]$_frac{n+1}{2}$ \
        even pixel values $n$ : & $dfrac{1}{2}left(mathbf{Dark}_mathbf{Flat}mathrm{[Bias]}_frac{n}{2} + mathbf{Dark}_mathbf{Flat}mathrm{[Bias]}_{frac{n}{2}+1}right)$ \
    end{block}
end{blockarray}

subsection{Survey}
...
end{document}