每页的页眉均带有图片

Question 1

建议将该包scrlayer-scrpage与 KOMA-Script 类一起使用。

例子：

\documentclass[a4paper,
  listof=totoc% <- syntax changed! 
]{scrreprt} 
\usepackage[T1]{fontenc}
%\usepackage[utf8]{inputenc}% only needed with outdated TeX distributions
\usepackage{lmodern}
\usepackage[ngerman, english]{babel}
\usepackage[bmargin=4cm,tmargin=2cm,headheight=5cm]{geometry}
\usepackage{graphicx}

\usepackage{blindtext}% only for dummy text in the MWE

% KOMA-Script package for header and footer
\usepackage[
  manualmark,% or automark for running header entries
  headsepline,
  %plainheadsepline% headsepline on plain pages, too
  ]{scrlayer-scrpage}
  
\usepackage{hyperref}% load as last package

% header and footer
\clearpairofpagestyles
\ihead*{\raisebox{-0.1\height}[0pt][0pt]{\includegraphics[scale=0.07]{example-image}}}
\ohead {Example entry}% or \ohead{\headmark} for running header entries
\cfoot*{\pagemark}

\setcounter{secnumdepth}{\subsubsectionnumdepth}
\setcounter{tocdepth}{\subsubsectiontocdepth}

\begin{document}

\begin{titlepage}
    \includegraphics[scale=.2]{example-image}\par\vspace{4cm} % put here your logo
    \vfill
    \centering
    \usekomafont{disposition}{\Huge Titlepage}
    \vfill
\end{titlepage}

\addchap{Abstract}
\Blindtext[2]
\addchap{Einverständniserklärung}
\Blindtext[2]

\tableofcontents
\blinddocument
\blinddocument

\end{document}

补充说明：

不要使用过时的 KOMA-Script 选项。我已将过时的选项替换为listof=totoc。

用于\addchap有目录（和页眉）条目的未编号章节。用于\addchap*没有目录和页眉条目的未编号章节。

hyperref在其他包之后加载该包。

Answer

建议将该包scrlayer-scrpage与 KOMA-Script 类一起使用。

例子：

\documentclass[a4paper,
  listof=totoc% <- syntax changed! 
]{scrreprt} 
\usepackage[T1]{fontenc}
%\usepackage[utf8]{inputenc}% only needed with outdated TeX distributions
\usepackage{lmodern}
\usepackage[ngerman, english]{babel}
\usepackage[bmargin=4cm,tmargin=2cm,headheight=5cm]{geometry}
\usepackage{graphicx}

\usepackage{blindtext}% only for dummy text in the MWE

% KOMA-Script package for header and footer
\usepackage[
  manualmark,% or automark for running header entries
  headsepline,
  %plainheadsepline% headsepline on plain pages, too
  ]{scrlayer-scrpage}
  
\usepackage{hyperref}% load as last package

% header and footer
\clearpairofpagestyles
\ihead*{\raisebox{-0.1\height}[0pt][0pt]{\includegraphics[scale=0.07]{example-image}}}
\ohead {Example entry}% or \ohead{\headmark} for running header entries
\cfoot*{\pagemark}

\setcounter{secnumdepth}{\subsubsectionnumdepth}
\setcounter{tocdepth}{\subsubsectiontocdepth}

\begin{document}

\begin{titlepage}
    \includegraphics[scale=.2]{example-image}\par\vspace{4cm} % put here your logo
    \vfill
    \centering
    \usekomafont{disposition}{\Huge Titlepage}
    \vfill
\end{titlepage}

\addchap{Abstract}
\Blindtext[2]
\addchap{Einverständniserklärung}
\Blindtext[2]

\tableofcontents
\blinddocument
\blinddocument

\end{document}