An optimized tongue image color correction scheme

Xingzheng Wang, Dapeng Zhang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

94 Citations (Scopus)


The color images produced by digital cameras are usually device-dependent, i.e., the generated color information (usually presented in RGB color space) is dependent on the imaging characteristics of specific cameras. This is a serious problem in computer-aided tongue image analysis because it relies on the accurate rendering of color information. In this paper, we propose an optimized correction scheme that corrects the tongue images captured in different device-dependent color spaces to the target device-independent color space. The correction algorithm in this scheme is generated by comparing several popular correction algorithms, i.e., polynomial-based regression, ridge regression, support vector regression, and neural network mapping algorithms. We test the performance of the proposed scheme by computing the CIE L*a*b*color difference ( Δ Eab*) between estimated values and the target reference values. The experimental results on the colorchecker show that the color difference is less than 5 ( Δ Eab*< 5 ), while the experimental results on real tongue images show that the distorted tongue images (captured in various device-dependent color spaces) become more consistent with each other. In fact, the average color difference among them is greatly reduced by more than 95.
Original languageEnglish
Article number5570961
Pages (from-to)1355-1364
Number of pages10
JournalIEEE Transactions on Information Technology in Biomedicine
Issue number6
Publication statusPublished - 1 Nov 2010


  • Color correction
  • sRGB color space
  • tongue image

ASJC Scopus subject areas

  • Biotechnology
  • Computer Science Applications
  • Electrical and Electronic Engineering


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