Function Addtion pada pengolahan citra digital

Function Addtion(MInput,MInput2:Matriks):Matriks;
var
i,j,k,l : integer;
MOutput : Matriks;
begin
if (Length(MInput)>Length(MInput2)) then
begin
SetLength(MOutput,Length(MInput),Length(MInput[0]));
  for i:=0 to Length(MOutput)-1 do
  begin
    for j:=0 to Length(MOutput[0])-1 do
    begin
      MOutput[i,j]:= MInput[i,j];
    end;
    end;
      for k:=0 to Length(MInput2)-1 do
  begin
    for l:=0 to Length(MInput2)-1 do
    begin
      MOutput[k,l]:=MInput[k,l] + MInput2[k,l];
      if (MOutput[k,l]>255) then MOutput[k,l]:=255
      else if (MOutput[k,l]<0) then MOutput[k,l]:=0;
    end;
  end;
  end
  else if (Length(MInput)<Length(MInput2)) then
begin
SetLength(MOutput,Length(MInput2),Length(MInput2[0]));
   for i:=0 to Length(MOutput)-1 do
  begin
    for j:=0 to Length(MOutput[0])-1 do
    begin
    MOutput[i,j]:= MInput2[i,j];
    end;
    end;
      for k:=0 to Length(MInput)-1 do
  begin
    for l:=0 to Length(MInput)-1 do
    begin
      MOutput[k,l]:=MInput2[k,l] + MInput[k,l];
      if (MOutput[k,l]>255) then MOutput[k,l]:=255
      else if (MOutput[k,l]<0) then MOutput[k,l]:=0;
    end;
  end;
  end;
  Addtion:=MOutput;
end;