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US 10,477,128 B2Granted
Neighborhood haze density estimation for single-image dehaze
AssigneeNikon Corporation
InventorsRipul Bhutani, Ping-Wei Chang, Bausan Yuan
Life of this patent
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Abstract
Dehazed images are produced based on an atmospheric light image obtained form an input image as brightest pixels of a predetermined window and white map. The white map is median filtered, morphologically filtered and, in some examples, filtered with a guided filter, and the filtered image combined with the atmospheric light image to produce a dehazed image.
Claims26
An image processor, comprising a memory storing processor-executable instructions for a method comprising:
- processing an input image to produce a bright channel image associated with largest brightness values in the input image over a first selected window;
- defining an atmospheric light image corresponding to atmospheric light based on the bright channel image;
- processing the input image to produce a white map image based on input image brightness and saturation values;
- producing a transmission map image based on the white map image, the atmospheric light image, and a haze value h, wherein 0≤h≤1;
- and
- determining a dehazed image based on the input image, the transmission map image, and the atmospheric light image.
3 more elements
An image processing method, comprising:
- with a processor,
- producing a smoothed image and an atmospheric light image based on an input image wherein the atmospheric light image is produced by processing the input image to produce a bright channel image associated with largest brightness values in the input image in associated windows, each of the associated windows having a common size;
- and
- dehazing the input image by combining the smoothed image, the atmospheric light image, and the input image.
1 more element
An image processing method, comprising:
- with a processor,
- processing the input image to produce a bright channel image;
- producing a smoothed image and an atmospheric light image based on the input image;
- and
- dehazing the input image by combining the smoothed image, the atmospheric light image, and the input image, wherein the atmospheric light image is produced by applying a guided filter to the bright channel image.
2 more elements
An image acquisition system, comprising:
- an image sensor;
- memory coupled to the image sensor so as to store an image;
- and
- a processor coupled to the memory so as to retrieve the image and produce a dehazed image based on pixel by pixel processing that produces a first image corresponding to morphologically filtering the input image and a second image corresponding to brightest pixels in the image over a predetermined window.
1 more element
Dependencies are inferred from the claim text.