Image processing apparatus, system, image processing method, calibration method, and computer-readable recording medium
An image processing apparatus includes: an acquisition unit that acquires a plurality of first images that correspond to a plurality of spatial frequencies on a one-to-one basis; and a generation unit that generates a second image by synthesizing the first images acquired by the acquisition unit.
1. An image processing apparatus, comprising:
first processing circuitry configured to
acquire a plurality of first images that correspond to a plurality of different spatial frequencies on a one-to-one basis, the plurality of spatial frequencies being selected to correspond to a predetermined plurality of different capturing distances, wherein each of the plurality of first images includes a spatial frequency component that corresponds thereto; and
generate a second image based on pixel values of the acquired first images.
2. The image processing apparatus according to claim 1 , wherein the first processing circuitry is further configured to generate an original image by randomly determining pixel values of a plurality of pixels included in an image region having a size different from a size of each first image, and, by resizing the original image into the size of each first image, generate one of the first images that corresponds to one spatial frequency of the plurality of spatial frequencies.
3. The image processing apparatus according to claim 2 , wherein
the size of the image region is smaller than the size of the first image, and
by enlarging the generated original image to the size of the first image, the first processing circuitry is configured to generate the one of the first images that corresponds to the one spatial frequency of the plurality of spatial frequencies.
4. The image processing apparatus according to claim 1 , wherein the first processing circuitry is further configured to generate the second image by obtaining and setting, for each set of corresponding pixels included in the plurality of first images, an average of luminance values of the pixels in the plurality of first images as luminance values of corresponding pixels in the second image.
5. The image processing apparatus according to claim 1 , wherein the first processing circuitry is further configured to control an output that is based on the generated second image.
6. A system, comprising:
a camera configured to capture an image of a target object having the second image displayed thereon, the second image being generated by the image processing apparatus according to claim 1 ; and
second processing circuitry configured to, based on a captured image containing an image of the target object and on a distance between the camera and the target object, calculate correction parameters to correct captured images obtained by image capturing with the camera.
7. An image processing method, comprising:
acquiring a plurality of first images that correspond to a plurality of different spatial frequencies on a one-to-one basis, the plurality of different spatial frequencies being selected to correspond to a predetermined plurality of different capturing distances, wherein each of the plurality of first images includes a spatial frequency component that corresponds thereto; and
generating a second image based on pixel values of the acquired first images.
8. An image processing method, comprising:
capturing, with a camera, images of a target object having the second image displayed thereon, the second image being generated by the image processing method according to claim 7 ; and
based on the captured images obtained in the capturing step and on a previously determined distance between the camera and the target object, calculating correction parameters to correct captured images obtained by image capturing with the camera.
9. A non-transitory computer-readable recording medium that contains a computer program that causes a computer to execute:
acquiring a plurality of first images that correspond to a plurality of different spatial frequencies on a one-to-one basis, the plurality of different spatial frequencies being selected to correspond to a predetermined plurality of different capturing distances, wherein each of the plurality of first images includes a spatial frequency component that corresponds thereto; and
generating a second image based on pixel values of the acquired first images.
10. The image processing apparatus of claim 1 , wherein the first processing circuitry is configured to acquire the plurality of first images that correspond to the plurality of spatial frequencies, which correspond to the predetermined plurality of capturing distances, the desired distances being based on desired image capturing distances between a camera and a target object on which the second image is displayed.