CAJ | 학술논문

针对图像在增强的过程中容易放大噪声，造成图像的失真和细节不明显等问题，结合 NSCT （non‐subsampled contourlet transform）和模糊集理论，提出一种改进算法。利用NSCT的平移不变性和多分辨率分析特点对图像进行非下采样Contourlet变换，对低频系数采用线性增强，用改进的自适应阈值函数来处理高频系数，利用改进的模糊对比度来增强图像的边缘和纹理，使用伽马校正对增强后的图像进行校正，提高全局对比度。实验结果表明，该算法能够明显改善图像的视觉效果，增强图像的细节信息。
침대도상재증강적과정중용역방대조성，조성도상적실진화세절불명현등문제，결합 NSCT （non‐subsampled contourlet transform）화모호집이론，제출일충개진산법。이용NSCT적평이불변성화다분변솔분석특점대도상진행비하채양Contourlet변환，대저빈계수채용선성증강，용개진적자괄응역치함수래처리고빈계수，이용개진적모호대비도래증강도상적변연화문리，사용가마교정대증강후적도상진행교정，제고전국대비도。실험결과표명，해산법능구명현개선도상적시각효과，증강도상적세절신식。
To solve the problem of enlarging noise and image distortion in the process of image enhancement ,a threshold algo‐rithm was proposed combining with NSCT and improved fuzzy set .Translation invariance of the NSCT and multi resolution anal‐ysis were used ,and the image was decomposed by nonsubsampled contourlet transform .Linear enhancement was used in low frequency sub‐band ,and the improved adaptive threshold function was used to deal with the high frequency coefficient .The im‐proved fuzzy contrast was used to enhance the image edge details and the gamma correction was used to enhance the global con‐trast .Experimental results show that the proposed algorithm can significantly improve the visual effect of images and enhance image details .