CAJ | 학술논문

对含噪图像小波阈值去噪方法中经典的阈值函数选取方式以及阈值选取方式的相关性能进行比较分析,在此基础上,构造出一种新的小波阈值去噪函数。新定义的阈值函数通过增加一个参变量来克服硬阈值函数不连续的缺点和软阈值函数高阶导数不连续的缺陷。理论分析和实验结果均表明,构造的小波阈值去噪函数具有更好的适应性和去噪效果。在图像含有强高斯噪声的情况下,新型阈值去噪方法相对软阈值法其峰值信噪比可以提高4dB到6dB。
대함조도상소파역치거조방법중경전적역치함수선취방식이급역치선취방식적상관성능진행비교분석,재차기출상,구조출일충신적소파역치거조함수。신정의적역치함수통과증가일개삼변량래극복경역치함수불련속적결점화연역치함수고계도수불련속적결함。이론분석화실험결과균표명,구조적소파역치거조함수구유경호적괄응성화거조효과。재도상함유강고사조성적정황하,신형역치거조방법상대연역치법기봉치신조비가이제고4dB도6dB。
Based on the comparative analysis in the wavelet image de-noising algorithm on threshold function,and analysis in the classic threshold function selection method as well as the performance of the threshold selection,a novel threshold function is put forward.Thus,it constructs a new wavelet threshold function;the function contains a variable,which can overcome both the shortcoming of the discontinuous in hard-threshold function and the discontinuous of higher derivative on soft-threshold function.The theoretical analysis and experimental results indicate that the new threshold function has better adaptability and de-noising effect.Especially in the strong Gaussian noise,the proposed method can relatively improve PSNR 4dB ~6dB than soft threshold method.