Abstract: A new method of objectively assessing image quality is presented. This method is based on high order statistics. It does not need the original image for reference, and can remove the effect of Gauss noise on the assessment of image quality. So it is suitable for use in the situation that the original image can not be obtained. Experimental results have shown the effectiveness of the proposed scheme. It is in accordance with the conventional assessment method PSNR in most of the cases, and it is also in good accordance with the image quality even in the cases that the PSNR is not.