1. A computer implemented iris image quality metric system comprising: a device for acquiring an iris image; and a data-processing apparatus; a quality processing module connected to the device; wherein the quality processing module is executed by the data-processing apparatus, the module and data-processing apparatus are operated in combination to provide a quality assessment of an iris image; wherein the quality assessment of the iris image includes an assessment of image blur; and image blur is measured according to high frequency distortions from coarse to fine wavelet coefficients.