According to the current development trends in the image quality assessment,a series of assessment methodologies and their corresponding measures were comparatively analyzed in depth. Several conventional measures of performance indices are tested with samples from the image database of LIVE in U-Texas at Austin,based on which the monotonicity,veracity,and consistency of various index measures are discussed,expounded and commented by using the subjective scores in the database,so as to indicate their applicability and limitations. Thus the VQEG standard is employed to validate the correctness of the above results. Moreover,some important issues in engineering applications and possible solving approaches are proposed based on the current development trends and requirements of practical applications.