摘要：Existing histogram based reversible data hiding schemes use only absolute
difference values between the neighboring pixels of a cover image. In these
schemes, maxima and minima points at maximum distance are selected in all the
blocks of the image which causes shifting of the large number of pixels to embed
the secret data. This shifting produces more degradation in the visual quality of
the marked image. In this work, the cover image is segmented into blocks, which
are classified further into complex and smooth blocks using a threshold value. This
threshold value is optimized using firefly algorithm. Simple difference values between
the neighboring pixels of complex blocks have been utilized to embed the
secret data bits. The closest maxima and minima points in the histogram of the
difference blocks are selected so that number of shifted pixels get reduced, which
further reduces the distortion in the marked image. Experimental results prove that
the proposed scheme has better performance as compared to the existing schemes.
The scheme shows minimum distortion and large embedding capacity. Novelty of
work is the usage of negative difference values of complex blocks for secret data
embedding with the minimal number of pixel shifting.
其他摘要：Existing histogram based reversible data hiding schemes use only absolute difference values between the neighboring pixels of a cover image. In these schemes, maxima and minima points at maximum distance are selected in all the blocks of the image which causes shifting of the large number of pixels to embed the secret data. This shifting produces more degradation in the visual quality of the marked image. In this work, the cover image is segmented into blocks, which are classified further into complex and smooth blocks using a threshold value. This threshold value is optimized using firefly algorithm. Simple difference values between the neighboring pixels of complex blocks have been utilized to embed the secret data bits. The closest maxima and minima points in the histogram of the difference blocks are selected so that number of shifted pixels get reduced, which further reduces the distortion in the marked image. Experimental results prove that the proposed scheme has better performance as compared to the existing schemes. The scheme shows minimum distortion and large embedding capacity. Novelty of work is the usage of negative difference values of complex blocks for secret data embedding with the minimal number of pixel shifting.
关键词：Reversible data hiding; complexity; MSE; PSNR; histogram shifting; BPCS; firefly
