Image processing method
AssigneeHitachi Kokusai Electric Inc.
InventorKazuhiko Nakamura
Life of this patent
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Abstract
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.
Claims1
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.
Dependencies are inferred from the claim text.