F5 employs matrix encoding to decrease the change for one payload, but its shrinkage at 0s makes it detectable. It is well known that J-Steg is detectable using the attack since it is based on simply flipping LSBs. Recently, many steganographic schemes using LSB and its improved versions on qDCT have been invented, which offer reasonably high embedding capacity while attempting to preserve the marginal statistics of the cover image, such as J-Steg, F5, and OutGuess.
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After performing DCT on each block and quantizing the DCT coefficients, message bits are embedded into the quantized DCT (qDCT) coefficients. In frequency domain, popular steganographic methods mostly base on Discrete Cosine Transformation (DCT). Although it has several disadvantages such as vulnerable to attacks, LSB steganography is a popular method because of its low computational complexity and high embedding capacity. Least Significant Bit (LSB) replacing is the most widely used steganographic method in spatial domain, which replaces the cover image's LSBs with message bits directly. Steganographic methods can be classified into spatial domain embedding and frequency domain embedding. The hidden message called payload could be a plain text, an audio file, a video file, or an image. The cover object could be a digital still image, an audio file, or a video file. Steganography is the science of hiding messages in a medium called carrier or cover object in such a way that existence of the message is concealed.