Image dynamic range compression system, method and program
AssigneeNEC Corporation
InventorAkihiko Iketani
Life of this patent
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Abstract
There is provided an image dynamic range compression system which can compress a dynamic range for which the visibility of a low-frequency image is ensured while preserving a high-frequency image. An image converting unit converts an input image into a compressed image having a narrower dynamic range than the input image. A high-frequency image extracting unit extracts a high-frequency image from the input image. An image synthesizing unit synthesizes a compressed image and the high-frequency image. Further, by adaptively changing synthesizing method of ensuring the visibility of images to synthesize, the image synthesizing unit synthesizes these images.
Claims8
An image dynamic range compression system comprising:
- an image converting unit configured to convert an input image into a compressed image which dynamic range is narrower than that of the input image;
- a high-frequency image extracting unit which configured to extract a high-frequency image from the input image;
- and
- an image synthesizing unit which configured to synthesize the compressed image and the high-frequency image,
- a registration unit configured to generate a high-frequency image that is registered to a high-frequency image extracted from the input image and another high-frequency image extracted from an image obtained by capturing an image of a same subject as the input image,
- wherein, the image synthesizing unit is further configured to synthesize the images by adaptively changing a synthesizing method of ensuring a visibility of images to synthesize,
- the registration unit is further configured to generate the high-frequency image that is registered to the high-frequency image extracted from the input image and an image obtained by geometrically converting the another high-frequency image,
- the image synthesizing unit is further configured to synthesize the compressed image and the registered high-frequency image,
- the registration unit is further configured to calculate registration reliability representing a degree of accuracy of registration for the generated high-frequency image, and
- the image synthesizing unit is further configured to change the synthesizing method for the compressed image and the high-frequency image according to the registration reliability.
An image dynamic range compressing method comprising:
- converting an input image into a compressed image which dynamic range is narrower than that of the input image;
- extracting a high-frequency image from the input image;
- synthesizing the compressed image and the high-frequency image by adaptively changing a synthesizing method of ensuring a visibility of images to synthesize;
- generating a high-frequency image that is registered to a high-frequency image extracted from the input image and another high-frequency image extracted from an image obtained by capturing an image of a same subject as the input image;
- generating the high-frequency image that is registered to the high-frequency image extracted from the input image and an image obtained by geometrically converting the another high-frequency image;
- synthesizing the compressed image and the registered high-frequency image;
- calculating registration reliability representing a degree of accuracy of registration for the generated high-frequency image;
- and
- changing the synthesizing method for the compressed image and the high-frequency image according to the registration reliability.
A non-transitory computer readable information recording medium storing a program which, when executed by a processor, performs a method comprising:
- converting an input image into a compressed image which dynamic range is narrower than that of the input image;
- extracting a high-frequency image from the input image;
- synthesizing the compressed image and the high-frequency image while adaptively changing a synthesizing method of ensuring a visibility of images to synthesize;
- generating a high-frequency image that is registered to a high-frequency image extracted from the input image and another high-frequency image extracted from an image obtained by capturing an image of a same subject as the input image;
- generating the high-frequency image that is registered to the high-frequency image extracted from the input image and an image obtained by geometrically converting the another high-frequency image;
- synthesizing the compressed image and the registered high-frequency image;
- calculating registration reliability representing a degree of accuracy of registration for the generated high-frequency image;
- and
- changing the synthesizing method for the compressed image and the high-frequency image according to the registration reliability.
Dependencies are inferred from the claim text.