Which of the following statements about image texture is correct: refers to which characteristics of the image? ( )

A、Imagetextureistherelativebrightnessofobjectsintheimage
B、Imagetextureistheapparentroughnessofanimageregion
C、Imagetextureistheapparentsmoothnessofanimageregion
D、Imagetextureisthefrequencyoftonalchangeonanimage