Image defogging device and image defogging method

Abstract

The invention provides an image demisting device and method. The device comprises an input unit used for inputting an original image, a first rough distance parameter obtaining unit used for calculating the rough distance parameters of each pixel in the original image, an edge obtaining unit used for calculating the edge information of the original image, a sky separating unit used for separating the sky area in the original image based on the edge information and the rough distance parameters, a second rough distance parameter obtaining unit used for correcting the rough distance parameters according to a sky separating result output by the sky separating unit, a rough distance parameter refining unit used for refining the corrected rough distance parameters, and a processing unit used for conducting demisting and white balancing by means of the refined rough distance parameters obtained through the rough distance parameter refining unit. By the adoption of the image demisting device, feature information of the image can be fully utilized, a better demisting effect can be obtained for a dust scene or a colored mist scene, and image distortion is avoided.

Description

technical field [0001] The invention relates to an image defogging device and an image defogging method. Background technique [0002] China's geographical environment is complex and the weather is diverse. Fog is often seen in most areas, and some areas are also affected by sand and dust. Fog and dusty weather reduce the visibility of outdoor video images. In addition, in large cities, the visibility of outdoor video images will also be reduced due to air quality problems. The reduction in visibility has a great impact on the quality of video images. Especially for the field of security monitoring, the impact is more obvious. Fog image clarity is an urgent practical requirement in the field of image processing. At the same time, in recent years, the breakthrough of dehazing technology based on single-frame image has made fogged image dehazing processing become an increasingly important research direction in the field of computer vision. [0003] At present, there are t...

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Problems solved by technology

However, since the sky itself is off-white, and the fog is also off-white, the effect on the defogging result does not seem obvious

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