Method and apparatus for generating an image coding signal
First Claim
1. A method of generating an image signal of a representation of a captured physical scene, the method comprising:
- providing, in the image signal, a first pixelised picture encoding and a second pixelised picture encoding, each pixelised picture encoding having a luminance component and a color component represented by sets of code words of a number N of bits, corresponding to a two-dimensional array of pixel positions;
encoding a first image of the captured physical scene with luminance and color code words in the first pixelised picture encoding;
encoding dynamic range extension data in the color component of the second pixelised picture encoding in lieu of color values, the dynamic range extension data corresponding to at least one region of pixels in the first image and representing a dynamic range extension transformation in the luminance component to obtain an increased dynamic range image based on the first pixelised picture, wherein the dynamic range extension data includes the luminance transformation or a modification of the luminance transformation.
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Abstract
An apparatus generates an image coding signal comprising for each image a first pixelized picture and a second pixelized picture having a luminance component and a chroma component. The apparatus comprises a first picture processor (203, 211) which includes image encoding data for an encoded first image in the first pixelized picture. A second picture processor (205, 207, 209, 211) includes dynamic range extension data in the second pixelized picture. The dynamic range extension data may be dynamic range extension data included in a chroma component of the second pixelized picture for generating an increased dynamic range image on the basis of the encoded first image. The compensation data may e.g. be compensation data for correcting another LDR-to-HDR transform, e.g. a prefixed global gamma transformation. The dynamic range extension data may be included in a luminance component and comprise data representing a dynamic range extension transform for generating an increased dynamic range image from the encoded first image.
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Citations
17 Claims
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1. A method of generating an image signal of a representation of a captured physical scene, the method comprising:
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providing, in the image signal, a first pixelised picture encoding and a second pixelised picture encoding, each pixelised picture encoding having a luminance component and a color component represented by sets of code words of a number N of bits, corresponding to a two-dimensional array of pixel positions; encoding a first image of the captured physical scene with luminance and color code words in the first pixelised picture encoding; encoding dynamic range extension data in the color component of the second pixelised picture encoding in lieu of color values, the dynamic range extension data corresponding to at least one region of pixels in the first image and representing a dynamic range extension transformation in the luminance component to obtain an increased dynamic range image based on the first pixelised picture, wherein the dynamic range extension data includes the luminance transformation or a modification of the luminance transformation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus for generating an image coding signal, the apparatus comprising:
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a memory; at least one processor configured to; generate a first pixelised picture encoding and a second pixelised picture encoding from a first image, each pixelised picture encoding having a luminance component and a color component; include image encoding data for the first image in the first pixelised picture encoding; include dynamic range extension data in the color component of the second pixelised picture in lieu of color values, the dynamic range extension data corresponding to at least one region of pixels in the first image and comprising data representing luminance transformation; and transform a luminance of the first image to obtain an increased dynamic range image, wherein the dynamic range extension data includes the luminance transformation or a modification of the luminance transformation.
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16. A method of generating an increased dynamic range image, the method comprising:
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receiving an image coding signal comprising a first pixelised picture encoding and a second pixelised picture encoding, each pixelised picture encoding having a luminance component and a color component, the image coding signal comprising image encoding data for a first image in the first pixelised picture encoding, and dynamic range extension data without color encoding data in the color component of the second pixelised picture encoding, the dynamic range extension data encoding for at least one region of pixels a transformation in a luminance component of the first image into an increased dynamic range image, the dynamic range extension data including the luminance transformation or a modification of the luminance transformation; generating the first image from the image encoding data of the first image in the first pixelised picture encoding; determining a dynamic range extension transformation process based on the dynamic range extension data; and applying the dynamic range extension transformation process to the first image to generate an enhanced dynamic range image.
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17. An apparatus for generating an increased dynamic range image, the apparatus comprising:
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a receiver; at least one processor configured to; receive, via the receiver, an image coding signal comprising a first pixelised picture encoding and a second pixelised picture encoding, each pixelised picture encoding having a luminance component and a color component, the image coding signal comprising image encoding data for a first image in the first pixelised picture encoding, and dynamic range extension data without color encoding data in the color component of the second pixelised picture encoding, the dynamic range extension data comprising data representing a luminance transformation of at least one region of pixels in the first image into an increased dynamic range image of the first image the dynamic range extension data including the luminance transformation or a modification of the luminance transformation; generate a lower dynamic range image from the image encoding data for the first image in the first pixelised picture encoding; and apply the luminance transformation, based on the dynamic range extension data, to the first image to generate the increased dynamic range image.
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Specification