Local enhancement apparatus and method to generate high dynamic range images by blending brightness-preserved and brightness-adjusted blocks
First Claim
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1. A local enhancement apparatus, comprising:
- a block divider, for dividing an image into a plurality of blocks;
a first enhancement unit, for performing a brightness-preserved enhancement on each of the plurality of blocks respectively to generate a plurality of brightness-preserved blocks;
a second enhancement unit, for performing a brightness-adjusted enhancement on each of the plurality of blocks respectively to generate a plurality of brightness-adjusted blocks;
a scene dynamic range estimator, for generating a dynamic range of the image according to characteristics of the image; and
a blender, for blending the brightness-preserved blocks and the brightness-adjusted blocks to generate an enhanced image based on the dynamic range.
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Abstract
An embodiment of a local enhancement apparatus is provided, in which a block divider divides an image into a plurality of blocks, and a first enhancement unit performs a brightness-preserved enhancement on each block of the plurality of blocks to generate a brightness-preserved block. A second enhancement unit performs a brightness-adjusted enhancement on the each block to generate a brightness-adjusted block. A scene dynamic range estimator generates a dynamic range of the image according to characteristics of the image. A blender blends the brightness-preserved blocks and the brightness-adjusted blocks to generate an enhanced image based on the dynamic range.
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Citations
19 Claims
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1. A local enhancement apparatus, comprising:
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a block divider, for dividing an image into a plurality of blocks; a first enhancement unit, for performing a brightness-preserved enhancement on each of the plurality of blocks respectively to generate a plurality of brightness-preserved blocks; a second enhancement unit, for performing a brightness-adjusted enhancement on each of the plurality of blocks respectively to generate a plurality of brightness-adjusted blocks; a scene dynamic range estimator, for generating a dynamic range of the image according to characteristics of the image; and a blender, for blending the brightness-preserved blocks and the brightness-adjusted blocks to generate an enhanced image based on the dynamic range. - View Dependent Claims (2, 3, 4)
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5. A multi-exposure imaging system, comprising:
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a long exposure image sensor, for capturing a long exposure image based on a long exposure from a scene; a short exposure image sensor, for capturing a short exposure image based on a short exposure from the scene; an exposure ratio calculator, for obtaining an exposure ratio of the long exposure to the short exposure; and a local enhancement apparatus, for dividing a composite image into a plurality of blocks, performing a brightness-preserved enhancement and a brightness-adjusted enhancement on each of the plurality of blocks to generate a plurality of brightness-preserved blocks and a plurality of brightness-adjusted blocks respectively, and blending the brightness-preserved blocks and the brightness-adjusted blocks to generate an enhanced image based on the exposure ratio. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 19)
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15. A local enhancement method, comprising:
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capturing a long exposure image and a short exposure image based on a long exposure and a short exposure respectively from a same scene; combining the long exposure image and the short exposure image to obtain a composite image; generating a dynamic range based on an exposure ratio of the long exposure to the short exposure; performing a brightness-adjusted contrast enhancement on the composite image to generate a first contrast enhanced image; performing a brightness-preserved contrast enhancement on the composite image to generate a second contrast enhanced image; and blending the first contrast enhanced image and the second contrast enhanced image based on the dynamic range. - View Dependent Claims (16, 17, 18)
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Specification