Study on digital arithmetic of image based on wavelet transforms

The wavelet transform is localized in both time domain and frequency domain, adaptable for multi-differentiation analysis of many signal features. It is widely applied in processing of signal and image, language identification and combination. Based on the quick arithmetic of 2-D DWT and MATLAB, analyzed the digital watermark inserted in the image after 2-D DWT, and performed a reverse transform. The original image encounters less loss and there is less loss to watermark information. This arithmetic is effective in digital watermark technique.