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US 10,319,085 B2Granted
Metadata-based image processing method and apparatus
AssigneeSamsung Electronics Co., Ltd.
InventorsByung-seok Min, Tae-gyu Lim, Seung-hoon Han, Ho-cheon Wey
Life of this patent
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Abstract
Disclosed are a method and apparatus for generating local metadata including position information of a similar color mapping region and a color mapping function of the similar color mapping region and a method and apparatus for correcting color components 5 of a pixel in a similar color mapping region based on local metadata.
Claims20
A metadata generation method comprising:
- acquiring at least one of a tone mapping function and a saturation correction function between a first image and a second image based on pixels included in the first image and pixels included in the second image;
- correcting the first image by performing the at least one of the tone mapping function and the saturation correction function on the first image;
- generating global metadata including the at least one of the tone mapping function and the saturation correction function;
- splitting the corrected first image into a plurality of regions based on spatial proximity and color similarity of pixels included in the corrected first image;
- acquiring a color mapping function of a first region among the plurality of regions by comparing color information of pixels in the first region with color information of pixels in the second image, which correspond to the pixels in the first region;
- acquiring a color mapping function of a second region among the plurality of regions by comparing color information of pixels in the second region with color information of pixels in the second image, which correspond to the pixels in the second region;
- setting the first region and the second region as a similar color mapping region by comparing the color mapping function of the first region with the color mapping function of the second region;
- acquiring a color mapping function of the similar color mapping region based on the color mapping function of the first region and the color mapping function of the second region;
- and
- generating local metadata including position information of the similar color mapping region in the corrected first image and the color mapping function of the similar color mapping region.
7 more elements
An image processing method comprising:
- receiving global metadata including at least one of a tone mapping function and a saturation correction function between a first image and a second image;
- correcting the first image by performing the at least one of the tone mapping function and the saturation correction function on the first image;
- receiving local metadata including position information of a similar color mapping region in the corrected first image and a color mapping function of the similar color mapping region;
- restoring the similar color mapping region in the corrected first image based on the position information of the similar color mapping region;
- and
- correcting color components of pixels in the restored similar color mapping region based on the color mapping function of the similar color mapping region.
3 more elements
An image decoding apparatus comprising:
- a communicator configured to receive a first image, local metadata, and global metadata;
- and
- a processor configured to:
- receive global metadata including at least one of a tone mapping function and a saturation correction function between the first image and a second image,
- correct the first image by performing the at least one of the tone mapping function and the saturation correction function on the first image,
- receive the local metadata including position information of a similar color mapping region in the corrected first image and a color mapping function of the similar color mapping region,
- restore the similar color mapping region in the corrected first image based on the position information of the similar color mapping region;
- and
- correct color components of pixels in the restored similar color mapping region based on the color mapping function of the similar color mapping region.
6 more elements
Dependencies are inferred from the claim text.