1. An image processing apparatus comprising: a correction unit which increases a luminance value in a low-luminance area that is partly present in an input image, by interpolating the low-luminance area using its surrounding area; a filter unit which generates a low-frequency component image by executing minimum value filter processing on an image corrected by said correction unit and then performing low-pass filter processing on the image subjected to the minimum value filter processing; an unit which generates a high-frequency component image by subtracting the low-frequency component image from the input image; an unit which generates a high-frequency component enhanced image by adding a luminance value of the high-frequency component image to the input image according to a preset ratio; and an output unit which alternately outputs the low-frequency component image and the high-frequency component enhanced image.