An Optimal Algorithm for Enhancing the Contrast of Chest Images Using the Frequency Filters Based on Fuzzy Logic

• Published in: Journal of Information and Communication Convergence Engineering, 15(2) Vol. 15; no. 2; pp. 131 - 136
• Main Authors: Choong-Ho Shin, Chai-Yeoung Jung
• Format: Journal Article
• Language: English
• Published: 한국정보통신학회JICCE 01.06.2017; 한국정보통신학회
• Subjects: 전자/정보통신공학; Fuzzy logic; Gaussian high-pass filter; High-frequency emphasis filter
• ISSN: 2234-8255; 2234-8883
• DOI: 10.6109/jicce.2017.15.2.131

Chest X-ray image cannot be focused in the same manner as optical lenses and the resultant image generally tends to be slightly blurred. Therefore, appropriate methods to improve the quality of chest X-ray image have been studied in this paper. As the frequency domain filters work well for slight blurring and moderate levels of additive noises, we propose an algorithm that is particularly suitable for enhancing chest image. First, the chest image using Gaussian high pass filter and the optimal high frequency emphasis filter shows improvements in the edges and contrast of the flat areas. Second, as compared to using histogram equalization where each pixel of chest image is characterized by a loss of detail and much noises, in using fuzzy logic, each pixel of chest image shows the detail preservation and little noise. KCI Citation Count: 0