CAJ | 학술논문

有效的图像清晰度评价函数是采用数字图像处理技术实现自动调焦的关键，论文提出了一种改进的Sobel算子图像清晰度评价函数，采用四方向模板来计算梯度，在一定程度上有效地解决了传统评价算子中方位局限性问题，同时使用强边缘像素的强度均值表示清晰度评价值，实验表明，该算法不仅具有良好的单峰性和无偏性，还能够比较不同图像之间的清晰度，能够更好地满足对图像聚焦评价函数的要求。
유효적도상청석도평개함수시채용수자도상처리기술실현자동조초적관건，논문제출료일충개진적Sobel산자도상청석도평개함수，채용사방향모판래계산제도，재일정정도상유효지해결료전통평개산자중방위국한성문제，동시사용강변연상소적강도균치표시청석도평개치，실험표명，해산법불부구유량호적단봉성화무편성，환능구비교불동도상지간적청석도，능구경호지만족대도상취초평개함수적요구。
The accuracy and efficiency of the sharpness function is a key to auto‐focusing based on digital image process‐ing technique .In this paper ,a modified sharpness evaluation function of image based on sobel is proposed ,which solves ef‐fectively ,to some degree ,the problem of the limited orientations in normal functions by using four models Sobel function .At the same time ,the sharpness‐evaluation value is represented by the mean value of magnitude of sharp edges .The experiment shows that the modified method not only has the advantages of single peak curve and high sensitivity ,but also can compare the sharpness‐evaluation values of different images ,which can satisfy the needs of sharpness‐evaluation function .