Abstract: To improve the resistance to compression and noise attack， a kind of image watermark encryption algorithm based on bandelet transform was put forward. Arnold scrambling， chaotic modulation and BoseChaudhuriHocquenghem(BCH)error correction coding were used in the watermark processing of images， which improved the security of the digital watermarking. The BCH codes were embedded at the location where the low frequency optimal geometric flow of the coefficient for the carrier image bandelet was diagonal. The results showed that the bandelet domain embedding method overcame the block effect in the Discrete Cosine Transform(DCT) domain and inherited the advantages of the wavelet domain， which had relatively strong data hiding capacity and better attack resistance. The bandelet domain embedding method made up the shortages of the wavelet domain and had much stronger resistance to compression and noise attack.

Key words: digital watermark, bandelet transform, Arnold scrambling, chaotic modulation, BoseChaudhuriHocquenghem code