MATLAB: Though image is hidden in the cover image as by your code but when noise is added then we lost the watermark , what if we add checksum to the watermark image and we can construct the watermark.

lsbsave watermark imagewatermark

how to save the watermark image when watermarking is done with lsb technique , how to make lsb more robust , can we use checksum ?

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Checksum would only help you to detect whether the watermark was still intact: it would not allow you to correct a watermark that has been altered. You need an Error Correcting Code (ECC) for that. One example is CRC, Cyclic Redundancy Check

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MATLAB: Watermarking

What's the type of myarray? Is it a double vector? Does "0101" mean "[0, 1, 0, 1]" actually?

Additional information is required: How are the dimensions of the image defined? Does the bit stream contain header data or the pixel values only? Is the original an 8, 16 or 24 bit greyscale image?

Possibly this solves the problem:

x = rand(1, 1600) > 0.5;  % Test data
y = 2.^(0:7) * reshape(x, 8, []);  % Bits -> Bytes
image = uint8(reshape(y, 20, 10)); % -> [80, 20] UINT8 grey scale image

MATLAB: What is code in matlab to embed and extract a watermark using lsb method

See attached demo which does that.

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MATLAB: Watermarking

MATLAB: What is code in matlab to embed and extract a watermark using lsb method

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