lifted wavelet transform in matlab

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MatLab

hi friends.

I use lwt2(image,'haar') to decompose an image to approximation matrix and detail coefficients.
values in detail coefficients are integer(negative and positive).

I use dec2bin(d,n) function to convert a integer to binary, but detail coefficients values are negative and positive, so this function release an error for negative numbers.

how i can decompose an image to positive matrices or how i convert a negative number to binary?
i do this work for a course project for steganography.

thanks.