noise_normalization: added invariant check
noise_normalization: added invariant check

ThomasWalter/vigra,cha007/vigra,funkey/vigra,timoMa/vigra,xiwei-zhang/vigra,DaveRichmond-/vigra,hmeine/vigra,dagophil/vigra,cbecker/vigra,funkey/vigra,DaveRichmond-/vigra,dstoe/vigra,kod3r/vigra,dagophil/vigra,dstoe/vigra,hmeine/vigra,xiwei-zhang/vigra,mmuellner/vigra,psteinb/vigra,hmeine/vigra,martinsch/vigra,DaveRichmond-/vigra,stuarteberg/vigra,ThomasWalter/vigra,stuarteberg/vigra,timoMa/vigra,funkey/vigra,xiwei-zhang/vigra,dagophil/vigra,funkey/vigra,timoMa/vigra,xiwei-zhang/vigra,kod3r/vigra,stuarteberg/vigra,martinsch/vigra,dagophil/vigra,kod3r/vigra,cha007/vigra,ThomasWalter/vigra,capturePointer/vigra,stuarteberg/vigra,dagophil/vigra,hmeine/vigra,psteinb/vigra,timoMa/vigra,ThomasWalter/vigra,cbecker/vigra,funkey/vigra,ThomasWalter/vigra,kod3r/vigra,hmeine/vigra,cbecker/vigra,mmuellner/vigra,ThomasWalter/vigra,capturePointer/vigra,cbecker/vigra,mmuellner/vigra,cha007/vigra,xiwei-zhang/vigra,capturePointer/vigra,capturePointer/vigra,hmeine/vigra,mmuellner/vigra,stuarteberg/vigra,cha007/vigra,DaveRichmond-/vigra,cbecker/vigra,mmuellner/vigra,mmuellner/vigra,timoMa/vigra,psteinb/vigra,psteinb/vigra,ThomasWalter/vigra,funkey/vigra,dagophil/vigra,capturePointer/vigra,hmeine/vigra,kod3r/vigra,cha007/vigra,cha007/vigra,cha007/vigra,cbecker/vigra,xiwei-zhang/vigra,stuarteberg/vigra,timoMa/vigra,psteinb/vigra,kod3r/vigra,DaveRichmond-/vigra,martinsch/vigra,mmuellner/vigra,timoMa/vigra,martinsch/vigra,stuarteberg/vigra,funkey/vigra,psteinb/vigra,capturePointer/vigra,dstoe/vigra,martinsch/vigra,dstoe/vigra,DaveRichmond-/vigra,dstoe/vigra,kod3r/vigra,dstoe/vigra,capturePointer/vigra,dagophil/vigra,martinsch/vigra,xiwei-zhang/vigra,psteinb/vigra,DaveRichmond-/vigra,dstoe/vigra