Single image quick defogging method based on improved atmospheric scattering model

An atmospheric scattering model, a single image technology, applied in the field of image processing, can solve the problems of unable to recover albedo, redundant calculation and so on

Active Publication Date: 2016-10-26
NANJING UNIV OF POSTS & TELECOMM
View PDF4 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The He method sets the atmospheric light of the scattering model as a global constant, and considers that each scene in the image is directly irradiated by atmospheric light, and for different scenes, the light intensity is likely to be different, so set the atmospheric light as a global constant Has obvious limitations, so no matter how you set the atmospheric light value, you can't restore the "idea...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Single image quick defogging method based on improved atmospheric scattering model
  • Single image quick defogging method based on improved atmospheric scattering model
  • Single image quick defogging method based on improved atmospheric scattering model

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0052] specific implementation plan

[0053] The invention will be described in further detail below in conjunction with the accompanying drawings.

[0054] The present invention takes the scene as the basic unit, redefines the atmospheric light A and transmittance t in the original scattering model as scene incident light L and scene transmittance T, and considers that the scene illuminance and scene transmittance in each scene are constant value, the improved scattering model is expressed as:

[0055] I(x,y)=L(i)·ρ(x,y)·T(i)+L(i)·(1-T(i)) (x,y)∈Ω i

[0056] In the above formula, i represents the scene label number, Ω i , L(i), and T(i) represent the position index set, scene incident light, and scene transmittance under the scene with the label number i, respectively.

[0057]Then, using the fog concentration as the basis for scene segmentation, the scene segmentation problem can be transformed into a clustering problem for the fog concentration distribution map, which c...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a single image quick defogging method based on an improved atmospheric scattering model. The method, to solve the detects of an atmospheric scattering model, is characterized by, redefining atmospheric light and transmittance in an original scattering model respectively, and on the basis of the improved model, to begin with, carrying out scene segmentation on a fogged image according to fog concentration characteristics; then, by means of a corrosion method proposed in a He method, and through an averaging strategy, estimating scene incident light L; next, by maximizing contrast information of each scene, roughly estimating the scene transmissivity T, and providing a transmissivity adaptive adjustment mechanism based on environment characteristics to realize flexible defogging; and finally, providing a guided total variation model to carry out edge optimization on the initial estimation result, and importing the optimization result to the improved scattering model to restore a clear image. The method can effectively solve the problems of illumination non-uniformity, over enhancement and oversaturation and the like, and is superior to existing mainstream defogging methods in the aspects of defogging capacity, universality and defogging speed.

Description

technical field [0001] The invention relates to a method for quickly defogging a single image based on an improved atmospheric scattering model, and belongs to the technical field of image processing. Background technique [0002] Due to the influence of smog in outdoor scenes, the imaging effect is often poor. The reason is that suspended water droplets and aerosols in the atmosphere can scatter, absorb, and refract reflected light, resulting in a decrease in the contrast, saturation, and color shift of the captured image, which cannot guarantee the execution accuracy of the outdoor machine vision system. Such as license plate number recognition, fire monitoring, etc. Therefore, how to effectively defog has become one of the research hotspots in the field of image processing. [0003] Image dehazing methods can be roughly divided into two categories: image enhancement dehazing and physical model-based image dehazing. The former does not consider the degradation mechanism...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G06T5/00G06T7/00
CPCG06T5/003G06T2207/30192
Inventor 张登银鞠铭烨李世锋
Owner NANJING UNIV OF POSTS & TELECOMM
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap