FIELD: information technology.
SUBSTANCE: method of embedding a message in a JPEG 2000 digital image involves replacing coding coefficients of medium-frequency and high-frequency wavelet transformation subranges, wherein embedding is performed after the procedure of quantisation into blocks of wavelet coefficients measuring N×N. Bit values of the embedded message are coded by the parity of the sum of values of wavelet coefficients in a block, wherein if the value of the embedded bit does not match the parity of the sum of values of wavelet coefficients in the block, the value of one of them is increased by one, wherein the wavelet coefficient whose value has the greatest fractional part is selected for modification.
EFFECT: maintaining integrity of embedded information.
3 dwg
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