Btukfyl

I would like to have a chapter design like

So in the Box of the title, should be an image in the background and above the number of the chapter.

The packages I'm using so far, are:

documentclass[a4paper,11pt,twoside]{scrbook} %{book}

setcounter{secnumdepth}{5}

setcounter{tocdepth}{5}

usepackage{fancybox}

usepackage{tikz}

usepackage{cleveref}

usetikzlibrary{arrows,automata}

usepackage[latin1]{inputenc}

usepackage{amssymb,amsmath,amsthm}

usepackage{needspace}

usepackage{mathabx}

usepackage{enumerate}

usepackage{makeidx}  

usepackage[ruled]{algorithm2e}

usepackage{mathrsfs}

usepackage[many]{tcolorbox}

Update:
by substituting the ducks through:

chapternumberbackground{begin{tikzpicture}includegraphics[width=.2linewidth]{logo.pdf}end{tikzpicture}}

I get an division by 0 error ... why? and how can I fix it?

You can do a lot of things with KOMA-Script's chapter headings, if you redefine chapterformat and chapterlinesformat or chapterlineswithprefixformat. If I interpret your question as

How to use ducks in chapter headings of KOMA-Script?

I could, e.g, do:

documentclass[chapterprefix]{scrbook}

usepackage{lmodern}% need scalable font

usepackage{tikzducks}% essential to use ducks

usepackage{blindtext}



RedeclareSectionCommand[%

  font=normalfonthugescshape,

  prefixfont=Large,

  innerskip=0pt

]{chapter}



letraggedchapterraggedleft



renewcommand*{chapterlineswithprefixformat}[3]{%

  IfArgIsEmpty{#2}{#3}{%

    rule{.333linewidth}{1pt} #2%

    parbox[b][dimexpr .2linewidth-dpstrutbox-baselineskip]{.78linewidth}{%

      raggedchapterstrutignorespaces #3%

    }hfill

    makebox[.2linewidth][r]{rule[-dpstrutbox]{linewidth}{1pt}}%

  }%

}

renewcommand*{chapterformat}{%

  IfUsePrefixLine{%

    chapappenskip

    usekomafont{chapter}%

    raisebox{dimexpr -.2linewidth+baselineskip}[0pt][0pt]{%

%      frame{%

        resizebox*{.2linewidth}{.2linewidth}{%

          currentchapternumberbackground

        }%

%      }%

      makebox[0pt][r]{%

        parbox{.2linewidth}{%

          centering

          fontsize{.75linewidth}{linewidth}selectfont

          raisebox{.75linewidth}{color{gray!50!red!50}thechapter}par

        }%

      }%

    }%

  }{%

    thechapterautodotenskip

  }%

}

newcommand*{chapternumberbackground}[1]{%

  renewcommand*{currentchapternumberbackground}{#1}%

}

newcommand*{currentchapternumberbackground}{%

  {color{red!50}rule{1cm}{1cm}}%

}



begin{document}

tableofcontents

chapternumberbackground{begin{tikzpicture}duckend{tikzpicture}}

chapter{Chapter Name}

blindtext



chapternumberbackground{begin{tikzpicture}duck[longhair=teal]end{tikzpicture}}

chapter{Another Chapter Name}

blindtext



chapternumberbackground{begin{tikzpicture}duck[crazyhair=green,eyebrow=blue]end{tikzpicture}}

chapter{Once more a Longer Chapter Name}

blindtext



end{document}

For more information about RedeclareSectionCommand, chapterformat and chapterlineswithprefixformat see the KOMA-Script manual also available in German. And don't forget the famous information about using ducks in TikZ.