Fig. 1

Denoised results for polluted “lenna” by adaptive wavelet tight frame and non-adaptive wavelet tight frame. a Denotes the original image and b is the noisy image. c, d are respectively the recovered images by adaptive wavelet tight frame method and the corresponding non-adaptive one with \(8 \times 8\) Haar wavelet. e = a–c and f = a–d are the corresponding difference images