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KMID : 0357520210440050473
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Journal of Radiological Science and Technology
2021 Volume.44 No. 5 p.473 ~ p.480
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Comparison of Based on Histogram Equalization Techniques by Using Normalization in Thoracic Computed Tomography
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Lee Young-Jun
Min Jung-Whan
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Abstract
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This study was purpose to method that applies for improving the image quality in CT and X-ray scan, especially in the lung region. Also, we researched the parameters of the image before and after applying for Histogram Equalization (HE) such as mean, median values in the histogram. These techniques are mainly used for all type of medical images such as for Chest X-ray, Low-Dose Computed Tomography (CT). These are also used to intensify tiny anatomies like vessels, lung nodules, airways and pulmonary fissures. The proposed techniques consist of two main steps using the MATLAB software (R2021a). First, the technique should apply for the process of normalization for improving the basic image more correctly. In the next, the technique actively rearranges the intensity of the image contrast. Second, the Contrast Limited Adaptive Histogram Equalization (CLAHE) method was used for enhancing small details, textures and local contrast of the image. As a result, this paper shows the modern and improved techniques of HE and some advantages of the technique on the traditional HE. Therefore, this paper concludes that various techniques related to the HE can be helpful for many processes, especially image pre-processing for Machine Learning (ML), Deep Learning (DL).
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KEYWORD
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Medical Image Processing, Histogram Equalization, Contrast Limited Histogram Adaptive Equalization, CT, Thoracic Scout
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