Motion image rendering systems and methods
View Patent ↗Systems and methods of rendering a motion image. A television signal is modified through a sine wave motion judder component to introduce intentional motion judder which can replicate the appearance of cinematic projection. To present 24 frames per second film via a 60 Hz television system with the “look” of a 72 Hz cinematic projector, a judder oscillator is set to generate a 24 Hz sinewave having a peak amplitude equal to 38.5% of the time difference between 24 Hz frames. The motion-judder component may periodically reverse the apparent direction of motion.
1. A method of representing nominal 24 frame per second film frames in a nominal 60 field per second television system, wherein respective television fields are created in a five field sequence, the method comprising:
corresponding a first television field to a film frame; and
creating a second field, a third field, a fourth field, and a fifth field by temporally interpolating film frames either forwards or backwards in a temporal interpolator by a time equal to 17.1% of the reciprocal of the film frame rate.
2. A method of modifying, in a processor, a sequence of television images corresponding to a nominal temporal sampling rate of 60 Hz in which the said images are modified according to a five-frame sequence, the method comprising:
generating a first image, the first image the same as a first field of the sequence;
generating a second image by temporally shifting a second field of the sequence backward by 30.9%;
generating a third image and a fourth image by interchanging a third field and a fourth field of the sequence; and
generating a fifth image by temporally shifting a fifth field of the sequence forward by 30.9%.
3. An apparatus for modifying an input sequence of temporal image-samples representing a moving image so as to obtain an output sequence of temporal image-samples in which the appearance of the said motion has been changed, the apparatus comprising:
a temporal interpolator configured to receive said input samples; and
a temporal phase signal generator configured to generate a temporal phase signal,
wherein the temporal interpolator serves, through interpolation of said input samples under the control of said phase signal, to create the said output sequence, and
wherein the temporal phase signal includes a periodic motion-judder component such that intentional, visible, periodic motion-judder is introduced when the said output temporal image-samples are displayed.
4. An apparatus for representing nominal 24 frame per second film frames in a nominal 60 field per second television system wherein respective television fields are created in a five field sequence, the apparatus comprising:
a processor configured to generate
a first television field corresponding to a film frame; and
a second television field, a third television field, a fourth television field, and a fifth television field created by temporally interpolating film frames either forwards or backwards by a time equal to 17.1% of the reciprocal of the film frame rate.
5. An apparatus for modifying a sequence of television images corresponding to a nominal temporal sampling rate of 60 Hz, wherein the said images are modified according to a five-field sequence, the apparatus comprising:
a processor configured to generate
a first image, the first image the same as a first field of the sequence,
a second image by temporally shifting a second field of the sequence backward by 30.9%,
a third image and a fourth image by interchanging a third field and a fourth field of the sequence, and
a fifth image by temporally shifting a fifth field of the sequence forward by 30.9%.
6. A non-transitory computer readable medium comprising:
instructions configured to cause a programmable processor to represent nominal 24 frame per second film frames in a nominal 60 field per second television system,
wherein respective television fields are created in a five field sequence in which:
a first television field corresponds to a film frame, and
a second field, a third field, a fourth field, and a fifth field are created by temporally interpolating film frames either forwards or backwards in a temporal interpolator by a time equal to 17.1% of the reciprocal of the film frame rate.
7. A non-transitory computer readable medium comprising:
instructions configured to cause a programmable processor to modify a sequence of television images corresponding to a nominal temporal sampling rate of 60 Hz in which the said images are modified according to a five-image sequence where
a first image is unmodified,
a second image is temporally shifted backwards by 30.9% of the time between adjacent images in the sequence,
a third field and a fourth field are interchanged, and
a fifth image is temporally shifted forwards by 30.9% of the time between adjacent images in the sequence.