Image processing method
There is disclosed an image processing method in which a video signal is inputted from an imaging optical system in which astigmatism remains, and is displayed on a two-dimensional display apparatus. Based on the circumferential direction modulation factor and radial direction modulation factor of a lens used in the imaging optical system, a signal including the amount of vertical or horizontal modulation factor correction proportional to an nth power (n is an integer greater than 1) of a distance from a center position of a screen of the two-dimensional display apparatus is outputted for at least one vertical or horizontal frequency of the two-dimensional display apparatus.
1. An image processing method to display on a location of a screen for a wide-aspect ratio imaging apparatus that uses a lens, comprising:
performing at least one of:
horizontal contour correction and vertical contour correction for multi-frequency enhancement, or
horizontal aperture modulation factor correction and vertical aperture modulation factor correction for multi-frequency enhancement;
obtaining type information, focal length information, and aperture ratio information of a lens;
obtaining and storing circumferential direction modulation factor information and radial direction modulation factor information of the lens;
individually calculating, for each frequency:
a first amount of vertical contour modulation factor correction and a first amount of horizontal contour modulation factor correction which are proportional to a distance of a pixel from a center of a screen,
a second amount of vertical contour modulation factor correction and a second amount of horizontal contour modulation factor correction which are proportional to a second power of the distance of the pixel from the center of the screen,
a third amount of vertical contour modulation factor correction and a third amount of horizontal contour modulation factor correction which are proportional to a fourth power of the distance of the pixel from the center of the screen,
a fourth amount of vertical contour modulation factor correction and a fourth amount of horizontal contour modulation factor correction which are proportional to a sixth power of the distance of the pixel from the center of the screen, and
a fifth amount of vertical contour modulation factor correction and a fifth amount of horizontal contour modulation factor correction which are proportional to an eighth power of the distance of the pixel from the center of the screen; and
displaying a location on the screen based on:
the type information, the focal length information, and the aperture ratio information of the lens,
the circumferential direction modulation factor information and the radial direction modulation factor information of the lens, and
the individually performed vertical contour modulation factor correction and horizontal contour modulation factor correction.