| Summary: | Bit-Plane Complexity Segmentation Steganography (BPCS) is a technique
that utilizes the characteristics of the human visual system in which human vision
can not distinguish the form of binary information in a complex pattern. One of
the most important process in BPCS steganography technique is the process of
determining the threshold value. In the pilot study of the BPCS steganography
technique, determination of threshold values is done directly by the user, where
the default value is 0.3. The determination of threshold values in this way is
inefficient, because if the user enters an inappropriate threshold value may cause
repetitive insertion of the data. Another problem is the use of α variables in
calculating the value of bit-plane complexity. Variable α is not able to detect the
distribution of black and white pixels in a bit-plane which has a certain periodic.
As an example of bit-plane with a chessboard motif has a value of α = 1, which is
the maximum value of α. Bit-plane with a chessboard motif has a distribution of
black and white pixels are periodic and therefore can not be classified as a
complex block. Error in determining the value of bit-plane complexity can affect
the quality of the resulting stego-image.
In this study, the determination of threshold values will use the fuzzy
approach. Threshold value will be determined based on two inputs, the ratio
comparison of messages and images and the average value of the bit-plane
complexity. The determination of threshold values in this way, can make the
process insertion faster. In addition, the use of β variables in calculating the
complexity value of a bit-plane, the resulting complexity value will more
precision and noise resulting from the insertion of the stego-image can be reduced.
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