DocumentCode :
3606164
Title :
Remote Sensing Image Enhancement Using Regularized-Histogram Equalization and DCT
Author :
Xueyang Fu ; Jiye Wang ; Delu Zeng ; Yue Huang ; Xinghao Ding
Author_Institution :
Sch. of Inf. Sci. & Eng., Xiamen Univ., Xiamen, China
Volume :
12
Issue :
11
fYear :
2015
Firstpage :
2301
Lastpage :
2305
Abstract :
In this letter, an effective enhancement method for remote sensing images is introduced to improve the global contrast and the local details. The proposed method constitutes an empirical approach by using the regularized-histogram equalization (HE) and the discrete cosine transform (DCT) to improve the image quality. First, a new global contrast enhancement method by regularizing the input histogram is introduced. More specifically, this technique uses the sigmoid function and the histogram to generate a distribution function for the input image. The distribution function is then used to produce a new image with improved global contrast by adopting the standard lookup table-based HE technique. Second, the DCT coefficients of the previous contrast improved image are automatically adjusted to further enhance the local details of the image. Compared with conventional methods, the proposed method can generate enhanced remote sensing images with higher contrast and richer details without introducing saturation artifacts.
Keywords :
discrete cosine transforms; geophysical image processing; image enhancement; remote sensing; DCT coefficients; discrete cosine transform; distribution function; global contrast enhancement method; image quality; input histogram; regularized-histogram equalization; remote sensing image enhancement; sigmoid function; table-based HE technique; Discrete cosine transforms; Discrete wavelet transforms; Distribution functions; Histograms; Image enhancement; Remote sensing; Standards; Contrast enhancement; discrete cosine transform (DCT); histogram; image enhancement; remote sensing images;
fLanguage :
English
Journal_Title :
Geoscience and Remote Sensing Letters, IEEE
Publisher :
ieee
ISSN :
1545-598X
Type :
jour
DOI :
10.1109/LGRS.2015.2473164
Filename :
7272036
Link To Document :
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