Video effect recall technique
AssigneeGvbb Holdings S.A.R.L.
InventorRalph Andrew Silberstein
Life of this patent
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Abstract
A video switcher (10) advantageously affords the capability of executing a video effect following recall that avoids visible artifacts upon transitioning from one effect to another. At the outset, the switcher identifies active elements within the video effect, the comprising those elements that undergo a change during execution of the video effect, as opposed to those that remain inert during effect execution. The switcher then dynamically calculates offset for application to an initial key frame value for the video effect to avoid any change in value to active elements upon initial effect recall. The offset value is applied to each subsequent interpolation of the video effect, thereby creating the desired result of applying only relative changes to the active elements of the video effect.
Claims17
A method for executing a video effect following recall, wherein the video effect manipulates an input video signal using elements, the method comprising:
- identifying, within the video effect, at least one active element of the video effect that undergoes an element value change upon execution of an initial key frame of the video effect;
- determining an offset value for each active element of the video effect based on a change between a current value of that active element and the value of that active element stored in the initial key frame of the video effect-upon effect recall;
- and
- interpolating each active element upon effect recall and adding the offset value to the interpolation for that element.
A video production device for executing a video effect following recall, wherein the video effect manipulates an input video signal using elements, the video production device comprising:
- first means for identifying, within the video effect, at least one active element of the video effect that undergoes an element value change upon execution of an initial key frame of the video effect;
- second means for determining an offset value for each active element of the video effect based on a change between a current value of that active element and the value of that active element stored in the initial key frame of the video effect upon effect recall;
- and
- means for interpolating each active element upon effect recall and adding the offset value to the interpolation for that element.
The video production device 13 wherein second means determines the offset value in accordance with the arithmetic difference between a current system value and an initial keyframe value.
Dependencies are inferred from the claim text.