针对小波变换在指纹识别中的应用，提出了一种基于小波变换的图像增强算法，利用低频系数图像在小波域估计指纹纹线方向，抑制了高频噪声对纹线方向的影响，实验表明，该算法对纹线模糊的指纹图像增强效果明显。-According to the fingerprint identification of wavelet transform in the application, and puts forward a kind of image based on wavelet transform enhancement algorithm, using image in low-frequency coefficients of wavelet domain estimate ridge directions, restrain the fingerprint of high-frequency noise, the influence of ridge directions experiments show that this algorithm for lines blurred image enhancement effect is obvious.