why extracting the secret message from the quantized DCT coefficient of the setgo image gives different message?

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Budoor Salem 2017-5-28

编辑： Walter Roberson 2017-5-28

when embedding DCT steganography this is the process

I did DCT on image value to switch to the transform domain

I did the quantization of the DCT coefficients

then I tried to hide in the LSB of each quantized DCT coefficients (that are not the DC or Zero or 1)

dequantization

inverse DCT

then same the stego image

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for extracting (here I have a problem )

1) I did the dct for the stego image value

2) quantization

3) then I tried to extract the LSB of these coefficients

however, I got a very different message

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would you please inform me is this process that I am using is wrong or correct and why it is not working for me

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