Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
  • H04N23/56—Cameras or camera modules comprising electronic image sensors; Control thereof provided with illuminating means
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
  • H04N25/50—Control of the SSIS exposure
  • H04N25/53—Control of the integration time
  • H04N25/531—Control of the integration time by controlling rolling shutters in CMOS SSIS
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
  • H04N23/60—Control of cameras or camera modules
  • H04N23/61—Control of cameras or camera modules based on recognised objects
  • H04N23/611—Control of cameras or camera modules based on recognised objects where the recognised objects include parts of the human body
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
  • H04N23/70—Circuitry for compensating brightness variation in the scene
  • H04N23/74—Circuitry for compensating brightness variation in the scene by influencing the scene brightness using illuminating means
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
  • H04N23/70—Circuitry for compensating brightness variation in the scene
  • H04N23/743—Bracketing, i.e. taking a series of images with varying exposure conditions

Definitions

• the present disclosure relates to systems and methods for optical imaging, in particular to non-contact skin imaging systems and methods for performing ambient light image correction.
• a critical issue in such imaging measurement systems is that when they are used in an uncontrolled environment, e.g. at home, there are typically inconsistencies in measurement due to undefined and potentially varying ambient lighting.
• ambient light removal techniques such as active illumination methods that involve controlled illumination to probe and infer scene properties maybe used.
• some currently available techniques include controlled capture setups, e.g. a light stage, for capturing images of a person or a scene in all lighting directions (multiplexed illumination), and re-render photorealistic images under arbitrary illumination.
• Some other techniques rely on projector-camera systems for projecting structured patterns for subsequent image analysis. While active technique can enable high-quality illumination analysis and editing, these systems are typically complex and expensive.
• a method for performing ambient light image correction comprises: providing pulsed illumination to an object; capturing, while the object is illuminated by the pulsed illumination from the light source, a plurality of images of the object at an exposure time shorter than the wave period of the pulsed illumination, such that each of the plurality of captured images comprises a plurality of bright bands and dark bands, wherein a bright band corresponds to a high state of the pulsed illumination and a dark band corresponds to a low state of the pulsed illumination, and wherein the pulse frequency of the illumination provided by the light source is not a multiple integral of the frame rate at which the plurality of images are captured; generating a first composite image comprising a plurality of bright bands from the plurality of captured images, by combining sections from the plurality of captured images which correspond to bright bands; generating a second composite image comprising a plurality of dark bands from the plurality of captured images, by combining sections from the plurality of captured images which correspond to dark bands; and generating an ambient light corrected
• a first composite image comprising a plurality of bright bands from the plurality of captured images is generated by combining sections from the plurality of captured images which correspond to bright bands.
• the first composite image may be generated by the control unit 130 of the system 100.

Landscapes

• Engineering & Computer Science (AREA)
• Multimedia (AREA)
• Signal Processing (AREA)
• Studio Devices (AREA)
• Image Processing (AREA)
• Image Analysis (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=68470373

Family Applications (1)

Country Status (5)

Cited By (6)

Families Citing this family (4)

Citations (4)

Family Cites Families (14)

• 2019
  • 2019-11-06 EP EP19207439.1A patent/EP3820134A1/en not_active Withdrawn
• 2020
  • 2020-10-30 WO PCT/EP2020/080501 patent/WO2021089422A1/en not_active Ceased
  • 2020-10-30 US US17/771,513 patent/US11700462B2/en active Active
  • 2020-10-30 CN CN202080077126.2A patent/CN114641982B/zh active Active
  • 2020-10-30 JP JP2022525822A patent/JP2023500510A/ja not_active Ceased
  • 2020-10-30 EP EP20796837.1A patent/EP4055812B1/en active Active

Patent Citations (4)

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