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The camera device estimated scene illumination lighting frequency.
Many light sources, such as most fluorescent lights, flicker at a rate that depends on the local utility power standards. This flicker must be accounted for by auto-exposure routines to avoid artifacts in captured images. The camera device uses this entry to tell the application what the scene illuminant frequency is.
When manual exposure control is enabled (CaptureRequest.ControlAeMode == OFF or CaptureRequest.ControlMode == OFF), the CaptureRequest.ControlAeAntibandingMode doesn't perform antibanding, and the application can ensure it selects exposure times that do not cause banding issues by looking into this metadata field. See CaptureRequest.ControlAeAntibandingMode for more details.
Reports NONE if there doesn't appear to be flickering illumination.
Possible values:
Optional - This value may be null on some devices.
Full capability - Present on all camera devices that report being CameraMetadata.INFO_SUPPORTED_HARDWARE_LEVEL_FULL devices in the CameraCharacteristics.InfoSupportedHardwareLevel key