US 2020/0005437 A1Published application

Image processing method and image processing apparatus for executing image processing method

AssigneeIix Inc.

InventorHiroshi Murase

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Abstract

An image processing method includes capturing a display image of a display panel in-focus with a camera; generating a first image by applying a high-pass filter to the captured image to remove or reduce a spatial frequency component corresponding to moiré that has appeared in the captured image; capturing the display image out-of-focus with the camera; generating a second image by applying a correction filter to the captured image to correct attenuation of the spatial frequency component of the captured image with the correction filter, and applying a low-pass filter to the corrected captured image; and generating a third image in which the moiré has been removed or reduced by compositing the first image and the second image. The sum of the transmittance of the high-pass filter and the transmittance of the low-pass filter is a constant value at any spatial frequency.

Claims6

Dependent claims

An image processing method in which a display image of a display panel in which pixels are aligned periodically is captured with a camera in which imaging pixels are aligned periodically, and the captured image of the camera is processed, the image processing method comprising:

an in-focus image capturing step of capturing the display image in-focus with the camera to obtain a first captured image;
a first image generation step of generating a first image by applying a high-pass filter to the first captured image and removing or reducing a spatial frequency component corresponding to moiré that appears in the first captured image;
an out-of-focus image capturing step of capturing the display image out-of-focus with the camera to obtain a second captured image;
a captured image correction step of correcting attenuation of the spatial frequency component of the second captured image using a correction filter by applying the correction filter to the second captured image;
a second image generation step of generating a second image by applying a low-pass filter to the second captured image, the second captured image having been corrected in the captured image correction step;
and
a third image generation step of generating a third image in which the moiré has been removed or suppressed, by compositing the first image and the second image,
wherein a sum of a transmittance of the high-pass filter and a transmittance of the low-pass filter is a constant value at any spatial frequency.

5 more elements

An image processing apparatus that includes a camera in which imaging pixels are aligned periodically and which is for capturing a display image of a display panel in which pixels are aligned periodically, the image processing apparatus being for processing a captured image captured by the camera, the image processing apparatus comprising:

a high-pass filter for generating a first image by removing or reducing a spatial frequency component corresponding to moiré in a first captured image obtained by capturing the display image in-focus with the camera;
a correction filter for correcting attenuation of a spatial frequency of a second captured image obtained by capturing the display image out-of-focus with the camera;
a low-pass filter for generating a second image by extracting only a low spatial frequency component in the spatial frequency component of the second captured image, which was corrected using the correction filter;
and
an image compositing unit for generating a third image in which the moiré has been removed or suppressed by compositing the first image and the second image,
wherein a sum of a transmittance of the high-pass filter and a transmittance of the low-pass filter is a constant value at any spatial frequency.

3 more elements

Dependencies are inferred from the claim text.