Image processing apparatus and image processing method
AssigneeCanon Kabushiki Kaisha
InventorNaoto Kimura
Life of this patent
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Abstract
An apparatus includes an image generation unit configured to generate, from an input image, a hierarchical image including a plurality of images different in frequency band from one another, a first gain map generation unit configured to generate a first gain map with use of the hierarchical image and a first tone characteristic, a second gain map generation unit configured to generate a second gain map with use of the first gain map and a second tone characteristic, and a processing unit configured to apply the second gain map to the input image.
Claims6
An apparatus comprising:
- an image generation unit configured to generate, from an input image, a hierarchical image including a plurality of images different in frequency band from one another;
- a first gain map generation unit configured to generate a first gain map with use of the hierarchical image and a first tone characteristic;
- a correction gain map generation unit configured to generate a correction gain map based on the first gain map and a second tone characteristic;
- a second gain map generation unit configured to correct the first gain map with use of the correction gain map to generate a second gain map;
- and
- a processing unit configured to apply the second gain map to the input image,
- wherein the second tone characteristic has a characteristic of cancelling tone conversion by the first tone characteristic with a signal value after application of the first tone characteristic to the input image as a horizontal axis.
A method comprising:
- generating, from an input image, a hierarchical image including a plurality of images different in frequency band from one another;
- generating a first gain map with use of the hierarchical image and a first tone characteristic;
- generating a correction gain map based on the first gain map and a second tone characteristic;
- correcting the first gain map with use of the correction gain map to generate a second gain map;
- and
- applying the second gain map to the input image,
- wherein the second tone characteristic has a characteristic of cancelling tone conversion by the first tone characteristic with a signal value after application of the first tone characteristic to the input image as a horizontal axis.
A non-transitory computer readable storage medium storing a computer-executable program of instructions for causing a computer to perform a method comprising:
- generating, from an input image, a hierarchical image including a plurality of images different in frequency band from one another;
- generating a first gain map with use of the hierarchical image and a first tone characteristic;
- generating a correction gain map based on the first gain map and a second tone characteristic;
- correcting the first gain map with use of the correction gain map to generate a second gain map;
- and
- applying the second gain map to the input image,
- wherein the second tone characteristic has a characteristic of cancelling tone conversion by the first tone characteristic with a signal value after application of the first tone characteristic to the input image as a horizontal axis.
Dependencies are inferred from the claim text.