Earticle

초록

영어

Scanned topographic maps of cities may have uneven illumination and creases. They need to go through color dodging. Due to the unsatisfying result by homomorphic filter of Retinex theory and the low efficiency when color dodging, this paper proposes an improved color dodging for scanned topographic maps based on Retinal-cortex theory. The main idea is to introduce Fastest Fourier Transform In The West (FFTW) to get the illumination component of the image on the basis of homomorphic filter of the Retinal-cortex algorithm, and use homomorphic filter to get the reflectance component and get the final image by linear stretching treatment. Experiments have proved that this method keeps the details of the image while erasing the creases so that the brightness distribution is improved.

목차

Abstract
 1. Introduction
 2. Retinex Theory and Single Scale Retinex Theory
  2.1. Retinex Theory
  2.2. Homomorphic filter based on SSR algorithm
 3. Optimizing Homomorphic Filter Algorithm
  3.1. Generation of Illumination Image
  3.2. Stretching Method of the Result Image
 4. Experiments and Analysis
  4.1. The Effect of Color Dodging for the Whole Image
  4.2. The Effect of Dodging for the Detail
  4.3 Treatment of White Spot on the Image
  4.4 Time Comparison between Homomorphic Filter and Improved Algorithm
 5. Conclusions
 Acknowledgements
 References

키워드

저자

• Tong Chunya [ Shool of Electronic and Information Engineering, Ningbo University of Technology, Ningbo, Zhejiang, 315016, China ]

참고문헌

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간행물

표지보기 관심저널 등록

• 간행물명

  International Journal of Signal Processing, Image Processing and Pattern Recognition

• 간기

  격월간

• pISSN

  2005-4254

• 수록기간

  2008~2016

• 십진분류

  KDC 505 DDC 605