Estimation of Image Focus Measure and Restoration by Wavelet

We present image focus measure which is based on wavelet transform of the image. A wavelet based method is proposed to estimate the blur in an image using information contained in the image itself. This image degradation obscures part of the information present in the image. The goal of image restoration, is to recover this information as good as possible. In this paper we propose a robust technique for image focus measure based on discrete wavelet transform (DWT). We suggest the absolute sum of the second-level detailed image of DWT as focus measure. We analysed this measure is monotonic with respect to the degree of defocusation. We experimentally illustrate its performance on simulated as well as real data and compare it with existing focus measures(gray-level variance and energy of Laplacian).