Patent ID: 11902675
Assignee: KOREA ELECTROTECHNOLOGY RESEARCH INSTITUTE
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  A  G | IPC A  G  H

Claim 0:
1. An optical filtering apparatus for generating a multi-wavelength image of a subject, the optical filtering apparatus comprising:
a filter unit configured to have a plurality of sub-filter units including a first sub-filter unit through which a first wavelength band passes and a second sub-filter unit through which a second wavelength band, which is different from the first wavelength band, passes;
a driving unit configured to drive the filter unit; and
an imaging unit configured to generate the multi-wavelength image of the subject,
wherein, while light generated in a light source passes through the filter unit, the filter unit filters the light such that an intensity of the first wavelength band is dominant in a first region and an intensity of the second wavelength band is dominant in a second region,
wherein the driving unit drives the filter unit such that the intensity of the first wavelength band is dominant in the first region at a first time point, the intensity of the second wavelength band is dominant in the first region at a second time point, and an nth wavelength band corresponding to the plurality of sub-filter units is sequentially dominant in the first region at a subsequent nth time point,
wherein the imaging unit generates the multi-wavelength image of the subject, by using one or two or more among a plurality of subject images generated at a plurality of time points, including a first subject image generated at the first time point and a second subject image generated at the second time point, and
wherein the imaging unit separates a 1-1-th wavelength image corresponding to the first wavelength band and a 1-2-th wavelength image corresponding to the second wavelength band from the first subject image generated at the first time point, separates a 2-1-th wavelength image corresponding to the first wavelength band and a 2-2-th wavelength image corresponding to the second wavelength band from the second object image generated at the second time point, and then generates a first wavelength correction image corrected using the 1-1-th wavelength image and the 2-1-th wavelength image, and generates a second wavelength correction image corrected using the 1-2-th wavelength image and the 2-2-th wavelength image.