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BPCS-Steganography (Bit-Plane Complexity
Segmentation Steganography) is a type of digital steganography. Typically,
it uses an image file in true color format (BMP image) for a
vessel. It can conceal (or "embed") very large amount of
"confidential" data file in the vessel. It is reported that the
ordinary embedding capacity amounts to 50% (or more) of the vessel
image size. The principle of the embedding is to replace "noisy"
areas on each bit-plane of the vessel image with the confidential
data. This steganography exploits the characteristecs of human
vision system which can't see any shape information in a very noisy
area on an image bit-plane. In the embedding process the image
color value is transformed from the pure binary
code system into the canonical gray code
sytem because the canonical gray code keeps better image quality
than pure binary code when the vessel is embedded with other data.
Noisy area on the bit-plane is segmented according to a complexity
measure for the binary image.
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