Method of flicker reduction
AssigneesApical Limited, Arm Limited
InventorsOzgur Tasdizen, Alexey Kornienko
Life of this patent
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Abstract
Examples of the present disclosure relate to a method for reducing artefacts caused by the presence of flicker during capture of a video. A sequence of frames of the video are captured, the frames each comprising a plurality of predefined regions each comprising a plurality of pixels. A time-varying oscillation of the flicker is characterized based on variations, across the sequence of frames, of data relating to pixel intensities in at least one said region. Based on the characterizing of the time-varying oscillation of the flicker, a flicker correction is applied to a frame of the video.
Claims17
A method for reducing artefacts caused by the presence of flicker during capture of a video, the method comprising:
- capturing a sequence of frames of the video, the frames each comprising a plurality of predefined regions each comprising a plurality of pixels;
- characterizing a time-varying oscillation of the flicker based on variations, across the sequence of frames, of data relating to pixel intensities in at least one said predefined region, wherein characterizing the time-varying oscillation of the flicker comprises determining an amplitude and a phase of the flicker, and generating a sinusoid indicative of the flicker using the amplitude and the phase of the flicker;
- and
- based on the characterizing of the time-varying oscillation of the flicker, applying a flicker correction to a frame of the video, wherein applying the flicker correction comprises inverting the generated sinusoid to generate a correction ratio, and using the correction ratio to apply the flicker correction to the frame of the video.
An apparatus for reducing artefacts caused by the presence of flicker during capture of a video, the apparatus comprising:
- a receiving module to capture a sequence of frames of the video, the frames each comprising a plurality of predefined regions each comprising a plurality of pixels;
- a characterization module to characterize a time-varying oscillation of the flicker based on variations, across the sequence of frames, of data relating to pixel intensities in at least one said predefined region, wherein characterizing the time-varying oscillation of the flicker comprises determining an amplitude and a phase of the flicker, and generating a sinusoid indicative of the flicker using the amplitude and the phase of the flicker;
- and
- a flicker correction module to, based on the characterizing of the time-varying oscillation of the flicker, apply a flicker correction to a frame of the video, wherein applying the flicker correction comprises inverting the generated sinusoid to generate a correction ratio, and using the correction ratio to apply the flicker correction to the frame of the video.
A non-transitory computer-readable storage medium comprising a set of computer-readable instructions stored thereon which, when executed by at least one processor, cause the at least one processor to:
- capture a sequence of frames of a video, the frames each comprising a plurality of predefined regions each comprising a plurality of pixels;
- characterize a time-varying oscillation of flicker present during capture of the video, the characterizing being based on variations, across the sequence of frames, of data relating to pixel intensities in at least one said predefined region, wherein characterizing the time-varying oscillation of the flicker comprises determining an amplitude and a phase of the flicker, and generating a sinusoid indicative of the flicker using the amplitude and the phase of the flicker;
- and
- based on the characterizing of the time-varying oscillation of the flicker, apply a flicker correction to a frame of the video, wherein applying the flicker correction comprises inverting the generated sinusoid to generate a correction ratio, and using the correction ratio to apply the flicker correction to the frame of the video.
A method for reducing artefacts caused by the presence of flicker during capture of a video, the method comprising:
- capturing a sequence of frames of the video, the frames each comprising a plurality of predefined regions each comprising a plurality of pixels;
- characterizing a time-varying oscillation of the flicker based on variations, across the sequence of frames, of data relating to pixel intensities in at least one said predefined region, wherein characterizing the time-varying oscillation of the flicker comprises determining an amplitude and a phase of the flicker;
- and
- based on the characterizing of the time-varying oscillation of the flicker, applying a flicker correction to a frame of the video,
- wherein the frame comprises a plurality of zones, and the method comprises identifying at least one of said zones as a flicker-free zone, and inhibiting the flicker correction in the at least one flicker-free zone.
Dependencies are inferred from the claim text.