Visibility range estimation method and system
First Claim
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1. A method for determining a visibility range of an area, comprising:
- obtaining at least one digital image of at least a portion of the area;
selecting a first region of interest from the at least one digital image and calculating a visibility attenuation factor based on a contrast map and a distance map of the first region of interest;
selecting a second region of interest from the at least one digital image and selecting pixels in the second region of interest based on the visibility attenuation factor; and
finding a pixel representing the longest distance and having a contrast around or above 5%,wherein the visibility range is determined based on the distance of the pixel.
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Abstract
The present disclosure provides methods and systems for estimating a visibility range in a visibility-degraded environment, e.g., fog. The methods and systems involve digital image processing.
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Citations
20 Claims
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1. A method for determining a visibility range of an area, comprising:
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obtaining at least one digital image of at least a portion of the area; selecting a first region of interest from the at least one digital image and calculating a visibility attenuation factor based on a contrast map and a distance map of the first region of interest; selecting a second region of interest from the at least one digital image and selecting pixels in the second region of interest based on the visibility attenuation factor; and finding a pixel representing the longest distance and having a contrast around or above 5%, wherein the visibility range is determined based on the distance of the pixel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for determining a visibility range of an area, comprising:
a processor configured to obtain a contrast map and a distance map for a first region of interest of a digital image of at least a portion of the area; calculate a visibility attenuation factor based on the contrast map and the distance map of the first region of interest; select pixels from a second region of interest of the digital image based on the visibility attenuation factor; and find a pixel representing the longest distance and having a contrast around or above 5%. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
Specification