英语翻译the first criterion to classify objective image quality

英语翻译
the first criterion to classify objective image quality measures is the availability of an "original image" which
is considered to be distortion-free or perfect quality,and may be used as a reference in evaluating a distorted
image.most of the proposed objective quality measures in the literature assume that the undistorted reference
image exists and is fully available .although "image quality" is frequently used for historical reasons,the more
precise term for this type of metric would be image similarity or fidelity measurement,or full reference(fr)
image quality assessment.