Watermarking Algorithm for Remote Sensing Image Based on QR Code and Block DCT Invariants

Quick response code (QR code) has the characteristics of high information capacity and strong error correcting ability. This paper uses the QR code as watermark information carrier, proposes a remote sensing image watermarking algorithm based on DCT invariant. Firstly, watermark is generated by the invariant in the DCT block of remote sensing image. Secondly, the initial position of DCT block is marked by intermediate frequency coefficients. Finally, the watermark information is embedded into the low frequency coefficients of DCT according to the quantization rule. As a blind watermark algorithm, the original data is not required in the detection process. Experiments have shown that the algorithm proposed in this paper is well robust against cutting attack, JPEG compression and usual image manipulation attacks.