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; 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 lowpass 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 by a preset ratio; and an output unit which alternately outputs the low-frequency component image and the high-frequency component enhanced image.