1. An image processing apparatus comprising: an acquisition unit configured to acquire each frame image as an input image; a first generation unit configured to generate an image obtained by emphasizing high frequency components in the input image as a high frequency component emphasized image; a second generation unit configured to generate a composite image by compositing the input image and an input image of a previous frame before the input image, and to generate an image including low frequency components in the composite image as a low frequency component image; and an output unit configured to alternately output the high frequency component emphasized image and the low frequency component image as images of sub-frames of the input image.