CAJ | 학술논문

针对多级半色调技术输出结果存在轮廓效应以及人工结构的问题，提出一种自适应噪声调制多级误差扩散半色调算法。首先利用加权均方误差约束求取噪声调制器的各项系数，并将噪声调制器插入至误差扩散法中的量化过程内；然后通过遗传算法，结合蓝噪声原理获取噪声调制后的最优自适应误差过滤器；最后利用所得的自适应误差过滤器完成量化误差滤波，输出半色调结果图像。实验结果表明，该算法可以有效地减少半色调输出结果中的轮廓效应和人工结构，并且具有较高的信噪比。
침대다급반색조기술수출결과존재륜곽효응이급인공결구적문제，제출일충자괄응조성조제다급오차확산반색조산법。수선이용가권균방오차약속구취조성조제기적각항계수，병장조성조제기삽입지오차확산법중적양화과정내；연후통과유전산법，결합람조성원리획취조성조제후적최우자괄응오차과려기；최후이용소득적자괄응오차과려기완성양화오차려파，수출반색조결과도상。실험결과표명，해산법가이유효지감소반색조수출결과중적륜곽효응화인공결구，병차구유교고적신조비。
In this paper , a multilevel error diffusion algorithm with adaptive noise modulation is proposed to alleviate the banding effects and other artifacts exited in the multilevel halftoning algorithms in literature .At first ,the coefficients of the noise modulator are computed based on the weighted mean square error balancing ,and the noise modulator is inserted into the quantization process of the error diffusion algorithm .T hen ,a blue noise spectrum based genetic algorithm is introduced to optimize the adaptive error diffusion filter with noise modulation .Finally ,the output image is obtained through the quantization error filtering with the adaptive error diffusion filter .Experimental results show that our algorithm could not only effectively reduce the banding effects and other artifacts ,but also achieve a nice signal‐to‐noise ratio .