1. A liquid crystal lens imaging apparatus, comprising: a lens group including at least a liquid crystal lens; a drive circuit connected to the liquid crystal lens to drive the liquid crystal lens either into an out-of-focus state or into an in-focus state; an image sensor configured to collect light signal passing through the lens group and to generate an image according to the light signal, wherein, when the liquid crystal lens is in the in-focus state, the image sensor generates an in-focus image of the light signal and, when the liquid crystal lens is in the out-of-focus state, the image sensor generates at least one out-of-focus image of the light signal; and an image processor connected to the image sensor, and configured to receive both the in-focus image and the at least one out-of-focus image and to process the in-focus image using the at least one out-of-focus image to weaken an image generated by interference light signal that is unmodulated by the liquid crystal lens in the in-focus image, such that a processed high-contrast in-focus image as a final generated image is obtained.