Color grading apparatus and methods
First Claim
1. A method for color grading input video data for display on a target display, the method comprising:
- by apparatus comprising one or more data processors configured by software, one or more programmable logic devices, one or more logic circuits or a combination thereof;
obtaining target display metadata indicative of a capability of the target display;
obtaining input video data metadata indicative of image characteristics of the input video data;
automatically determining initial values for parameters of a parameterized transfer function, at least one of the initial values based at least in part on at least one of the target display metadata and the input video data metadata;
mapping the input video data to color-graded video data according to the parameterized transfer function specified using the initial values, wherein the parameterized transfer function comprises a non-linear region in log-log space;
and providing a control for manually adjusting a value of a first parameter, the control configured to, in response to a manual control adjustment, adjust the value of a first parameter and adjust a value of a second parameter by an amount proportional to the adjustment of the value of the first parameter.
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Abstract
A method for color grading input video data for display on a target display comprises obtaining target display metadata indicative of a capability of the target display, obtaining input video data metadata indicative of image characteristics of the input video data, automatically determining initial values for parameters of a parameterized sigmoidal transfer function, at least one of the initial values based at least in part on at least one of the target display metadata and the input video data metadata and mapping the input video data to color-graded video data according to the parameterized transfer function specified using the initial values.
80 Citations
33 Claims
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1. A method for color grading input video data for display on a target display, the method comprising:
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by apparatus comprising one or more data processors configured by software, one or more programmable logic devices, one or more logic circuits or a combination thereof; obtaining target display metadata indicative of a capability of the target display; obtaining input video data metadata indicative of image characteristics of the input video data;
automatically determining initial values for parameters of a parameterized transfer function, at least one of the initial values based at least in part on at least one of the target display metadata and the input video data metadata;mapping the input video data to color-graded video data according to the parameterized transfer function specified using the initial values, wherein the parameterized transfer function comprises a non-linear region in log-log space; and providing a control for manually adjusting a value of a first parameter, the control configured to, in response to a manual control adjustment, adjust the value of a first parameter and adjust a value of a second parameter by an amount proportional to the adjustment of the value of the first parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. Apparatus for color grading input video data for display on a target display, the apparatus comprising:
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an input configured to receive input video data; an initial parameter generator configured to generate initial values for parameters of a parameterized transfer function, wherein the parameters comprise a plurality of control points which characterize the parameterized transfer function, at least one of the initial values based at least in part on at least one of target display metadata indicative of a capability of a target display and input video data metadata indicative of image characteristics of the input video data; a mapping unit configured to apply the parameterized transfer function characterized by the initial values to the input video data to generate color-graded video data, wherein the parameterized transfer function comprises a non-linear region in log-log space; and a control interface comprising a control for manually adjusting a value of a first parameter, the control configured to, in response to a manual control adjustment, adjust the value of a first parameter and adjust a value of a second parameter by an amount proportional to the adjustment of the value of the first parameter. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification