The invention relates to a method for operating a camera assembly, in which a first camera and a second camera capture images (36, 42). Respective fields of view of the two cameras overlap at least in a partial region (24). At least in an image (36) captured by the first camera, at least one contamination region (38) including a plurality of pixels is detected within the partial region (24). Thereupon, data values specifying the respective transparency of the pixels in the at least one contamination region (38) are varied with respect to respective reference values of transparency, wherein those reference values increase in the partial region (24) towards an edge (28) of the respective images upon superimposition of the images. Furthermore, the invention relates to a camera assembly.