CAJ | 학술논문

为了克服硬阈值函数不连续，软阈值函数中估计小波系数与分解小波系数之间存在着恒定偏差的缺陷，更好地改进滤波效果，提高去噪质量，须采用一种新的阈值处理策略。新阈值函数表达式简单易于计算，克服了硬软阈值的缺点。实验结果表明，该方法可以有效地去除白噪声干扰，无论是在视觉效果上还是在信噪比和均方误差定量指标上均明显优于常用的软、硬阈值及Matlab的阈值优化算法，充分体现出其优越性。
위료극복경역치함수불련속，연역치함수중고계소파계수여분해소파계수지간존재착항정편차적결함，경호지개진려파효과，제고거조질량，수채용일충신적역치처리책략。신역치함수표체식간단역우계산，극복료경연역치적결점。실험결과표명，해방법가이유효지거제백조성간우，무론시재시각효과상환시재신조비화균방오차정량지표상균명현우우상용적연、경역치급Matlab적역치우화산법，충분체현출기우월성。
To overcome the defect of discontinuousness of hard threshold function and the constant deviation of estimated wavelet coef -ficients and descomposed wavelet coefficients of soft threshold function , and better improve the filtering result and enhance the denois-ing quality, a new threshold management strategy is adopted .The new threshold function expression is simple and easy to calculate , which overcomes the shortcomings of hard and soft threshold function .The result of this experiment displays that this method can wipe out the white noise efficiently .It is superior to common hard and soft threshold and matlab threshold optimization algorithm whether in visual effect or noise ratio and mean squared error , which fully reflects the superiority of wavelet threshold denoising method .