Dual-ended metadata for judder visibility control
AssigneeDolby Laboratories Licensing Corporation
InventorsNing Xu, James E. Crenshaw, Scott Daly, Samir N. Hulyalkar, Raymond Yeung
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Abstract
Methods and systems for controlling judder are disclosed. Judder can be introduced locally within a picture, to restore a judder feeling which is normally expected in films. Judder metadata can be generated based on the input frames. The judder metadata includes base frame rate, judder control rate and display parameters, and can be used to control judder for different applications.
Claims17
A computer-implemented method at a display end to control judder visibility of a video encoded at a frame rate below a cut-off frame rate for perception of judder, wherein judder refers to visual distortions resulting from non-smooth motion due to the encoding at the frame rate below the cut-off frame rate, the method comprising:
- providing at least two input video frames at an input frame rate;
- receiving judder control metadata that have been generated, by a computer at a content production end, based on the at least two input video frames, wherein the judder control metadata includes both a base frame rate and a function of a discrete display time;
- and
- applying the judder control metadata to a frame rate control algorithm, wherein the frame rate control algorithm is configured to generate interpolated video frames based on the at least two input video frames such that the generated interpolated video frames have an expected level of judder visibility as intended at the content production end and defined by the judder control metadata,
- wherein the base frame rate refers to a frame rate that has been used to visually verify the judder control or film look experience of the at least two input video frames, with the desired level of judder applied,
- wherein the judder control metadata further comprises a judder control rate, wherein the judder control rate is spatially variant within a frame.
A computer-implemented method at a display end to control judder visibility of a video encoded at a frame rate below a cut-off frame rate for perception of judder, wherein judder refers to visual distortions resulting from non-smooth motion due to the encoding at the frame rate below the cut-off frame rate, the method comprising:
- providing at least two input video frames at an input frame rate;
- receiving judder control metadata that have been generated, by a computer at a content production end, based on the at least two input video frames, wherein the judder control metadata includes both a base frame rate and a function of a discrete display time;
- providing display signal metadata, wherein the display signal metadata comprises a minimum, midpoint, and maximum of an input signal;
- obtaining output display parameters, wherein the output display parameters comprise a minimum and maximum luminance of a reference display used for determining an expected level of judder visibility as intended at the content production end;
- and
- applying the judder control metadata to a frame rate control algorithm, wherein the frame rate control algorithm is configured to generate interpolated video frames based on the at least two input video frames such that the generated interpolated video frames have the expected level of judder visibility as intended at the content production end and defined by the judder control metadata, the display signal metadata and the output display parameters,
- wherein the base frame rate refers to a frame rate that has been used to visually verify the judder control or film look experience of the at least two input video frames, with the desired level of judder applied,
- wherein the judder control metadata further comprises a judder control rate, wherein the judder control rate is spatially variant within a frame.
Dependencies are inferred from the claim text.