Patent ID: 11889032
Assignee: HANGZHOU HIKVISION DIGITAL TECHNOLOGY CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An apparatus for acquiring an image, comprising an image sensor, a light compensator, and a light filter assembly, wherein,
the image sensor is on a light output side of the light filter assembly;
the image sensor is configured to generate and output a first image signal and a second image signal by a plurality of exposures, wherein the first image signal is generated according to a first preset exposure, the second image signal is generated according to a second preset exposure, and the first preset exposure and the second preset exposure are two of the plurality of exposures;
the light compensator comprises a first light compensation apparatus, wherein the first light compensation apparatus is configured to perform near-infrared light compensation, and the near-infrared light compensation is performed in at least part of an exposure period of the first preset exposure but is not performed in an exposure period of the second preset exposure; and
the light filter assembly comprises a first light filter, wherein the first light filter allows visible light and part of near-infrared light to pass through;
wherein, in a case that a central wavelength for the near-infrared light compensation by the first light compensation apparatus is a specified characteristic wavelength or falls within a specified characteristic wavelength range, a central wavelength and/or a wave-band width of the near-infrared light passing through the first light filter meet(s) a constraint condition; and
wherein the constraint condition comprises:
a difference between the central wavelength of the near-infrared light passing through the first light filter and the central wavelength for the near-infrared light compensation by the first light compensation apparatus is within a wavelength fluctuation range, and the wavelength fluctuation range is 0 nm to 20 nm;
a semi-bandwidth of the near-infrared light passing through the first light filter is less than or equal to 50 nm;
a first wave-band width is less than a second wave-band width, wherein the first wave-band width is a wave-band width of the near-infrared light passing through the first light filter; and the second wave-band width is a wave-band width of near-infrared light blocked by the first light filter; or
a third wave-band width is less than a reference wave-band width, wherein the third wave-band width is a wave-band width of near-infrared light with a passing rate being greater than a specified proportion, and the reference wave-band width is any wave-band width in a wave band range of 50 nm to 150 nm.