US 11,991,443 B2
Image processing device and image processing method capable of correcting distortion occurred in an image captured through a zoom lens
Toshihide Kobayashi, Yokohama (JP); and Masakazu Tateishi, Yokohama (JP)
Assigned to JVCKENWOOD CORPORATION, Yokohama (JP)
Filed by JVCKENWOOD Corporation, Yokohama (JP)
Filed on Aug. 12, 2022, as Appl. No. 17/819,375.
Application 17/819,375 is a continuation of application No. PCT/JP2020/047940, filed on Dec. 22, 2020.
Claims priority of application No. 2020-023458 (JP), filed on Feb. 14, 2020.
Prior Publication US 2022/0385802 A1, Dec. 1, 2022
Int. Cl. H04N 23/67 (2023.01); H04N 23/69 (2023.01)
CPC H04N 23/67 (2023.01) [H04N 23/69 (2023.01)] 8 Claims
OG exemplary drawing
 
1. An image processing device comprising:
a correction value table in which a correction value is set, the correction value being in accordance with a distance between a center of a frame of a captured image captured through a zoom lens, and a pixel positioned in the frame;
a first multiplier configured to multiply a correction value by an adjustment coefficient and to generate an adjusted correction value, the correction value being read from the correction value table in accordance with a distance between the center of the frame and each target pixel in the frame, and the adjustment coefficient being determined from at least a zoom magnification and a focus distance of the zoom lens;
a second multiplier configured to multiply the adjusted correction value by a cosine of an angle formed between a position of the each target pixel and the center of the frame and to generate a horizontal correction value that corrects the each target pixel in a horizontal direction; and
a horizontal filter configured to add all multiplication results obtained by multiplying a plurality of pixels in a left-right direction with the each target pixel as a center by left-right asymmetric coefficients, to generate a horizontal high-pass filter component, to add, to the each target pixel, a horizontal correction component obtained by multiplying the horizontal high-pass filter component by the horizontal correction value, and to correct the each target pixel in the horizontal direction.