Re-added 3x3 Sobel option for noise issues (specifically faxes)
Re-added 3x3 Sobel option for noise issues (specifically faxes)


dmtx/dmtx-wrappers,dmtx/dmtx-wrappers,dmtx/dmtx-wrappers,NaturalHistoryMuseum/dmtx-wrappers,NaturalHistoryMuseum/dmtx-wrappers,dmtx/dmtx-utils,dmtx/dmtx-wrappers,NaturalHistoryMuseum/dmtx-wrappers,NaturalHistoryMuseum/dmtx-wrappers,NaturalHistoryMuseum/dmtx-wrappers,dmtx/dmtx-wrappers,dmtx/dmtx-wrappers,dmtx/dmtx-utils,NaturalHistoryMuseum/dmtx-wrappers,dmtx/dmtx-wrappers,dmtx/dmtx-wrappers,NaturalHistoryMuseum/dmtx-wrappers,NaturalHistoryMuseum/dmtx-wrappers,dmtx/dmtx-utils