提出了一种基于非采样连续小波变换的模值梯度法的清晰度评价准则，对恢复图像的清晰度进行评价-Proposed a sampling based on non-continuous wavelet transform modulus values of the clarity of evaluation criteria gradient method, to restore the clarity of the image evaluation

变换域的数字图像水印技术及图像质量评价研究-Study of digital image watermarking in frequency domain and image quality evaluation