Image quality evaluation of the traditional method MSE and PSNR are base on full reference(FR) quality assessment.It requires a reference image

so it is not practical to be used.While the no reference(NR) just can deals with this problem

so it is of great significance.Aiming at the object digital image quality assessment

to the degree of detecting the distance of blur

this paper presents a no reference metric of blur estimation base on the edge detection.After the analysis and comparison of the result

of which the relevance to the subjective quality perception is better than some other blur estimation metric which only detects the edge or estimates the blur.Whats more

since the low complexity of algorithm，the needless for source of reference

and the proposed metric can be practically used.