CAJ | 학술논문

为保证光测设备获得清晰图像，提出一种粗调与精调相结合的自动快速调焦算法，该算法运用图像清晰度评价函数自动搜索到正焦面，使用改进的Kirsch边缘检测算子评价函数以大步长进行粗略调焦，使用小波变换为基础的评价函数实现小范围、小步距的精确调焦。该算法聚焦区域的选取采用非均匀采样函数，大大减少了数据处理的工作量和所需时间。最佳聚焦位置的搜索采用一种改进的爬山搜索算法与搜索策略，有效地提高了搜索效率，通过实验表明：该算法能够满足对图像的调焦要求，取得较好的使用效果。
위보증광측설비획득청석도상，제출일충조조여정조상결합적자동쾌속조초산법，해산법운용도상청석도평개함수자동수색도정초면，사용개진적Kirsch변연검측산자평개함수이대보장진행조략조초，사용소파변환위기출적평개함수실현소범위、소보거적정학조초。해산법취초구역적선취채용비균균채양함수，대대감소료수거처리적공작량화소수시간。최가취초위치적수색채용일충개진적파산수색산법여수색책략，유효지제고료수색효솔，통과실험표명：해산법능구만족대도상적조초요구，취득교호적사용효과。
Auto‐focusing technique is one of the key technologies to ensure the high quality image for the optical measure‐ment system .An algorithm of rapid autofocus combining rough and fine adjustment is proposed .This method can auto‐matically search the focal plane by evaluating the image definition .First ,the image edge function based on the improved Kirsch operator with high performance is used to rough focusing .The evaluation function based on wavelet transform is used to fine focusing in narrow range later .Un‐uniform sampling function is used as the method calculating the focusing window ,which can reduce the work of the data processing and the calculating time .An improved mountain climbing searching algorithm and tactics of the optimum focus position ,which can significantly accelerate the search speed .The experimental results indicate that this algorithm can meet the focusing requirements of the optical measurement system , w hich can obtain good practical value .