The invention provides an
underwater image quality evaluating and measuring method based on power spectrum description. As for an
underwater image I, the
image quality of I is set as PSVIQE={C,Q}, wherein C is a factor describing
underwater imaging environments, and Q is a quality measuring value of the underwater image; C is used for distinguishing the underwater environments where the underwater image is located, wherein the larger C is, the better
water transparency is, clear imaging is facilitated, and the smaller C is, the higher absorption and
scattering attenuation of water are; Q is used for measuring the
clarity degree of the underwater image; if Q is larger, it is shown that the image comprises a target and is relatively clear, and if Q is smaller, it is shown that the underwater image does not comprise the target or is relatively blurred; an average block definition and
image quality measuring method is adopted for Q, global contrast is selected in the method,
quality measurement is conducted on the basis of partial definition, and a result of
image edge detection is used as the basis for judging whether the target exists or not. The underwater image quality evaluating and measuring method is high in universality, combines imaging environment description and image
quality measurement, and can be used for evaluating the value of the target image for observers in a severe imaging environment more effectively.