CAJ | 학술논문

手持相机拍摄的文档图像存在不同程度的镜头失真.根据文档图像的文本行信息,提出了一种基于数学形态学的镜头校正算法.首先利用自适应阈值方法分割文档图像,并通过形态学闭运算把连通体聚类为文本行.然后利用二次多项式模型拟合文本行的中心线,并建立径向失真校正的目标函数.该目标函数把中心线对应的曲线映射为直线,从而求出文档图像的镜头失真参数.实验结果表明,该校正算法可以有效地校正文档图像各种程度的径向失真.
수지상궤박섭적문당도상존재불동정도적경두실진.근거문당도상적문본행신식,제출료일충기우수학형태학적경두교정산법.수선이용자괄응역치방법분할문당도상,병통과형태학폐운산파련통체취류위문본행.연후이용이차다항식모형의합문본행적중심선,병건립경향실진교정적목표함수.해목표함수파중심선대응적곡선영사위직선,종이구출문당도상적경두실진삼수.실험결과표명,해교정산법가이유효지교정문당도상각충정도적경향실진.
Document image captured by hand-held camera suffers from lens distortion more or less, and a mathematic morphology based lens correction algorithm was proposed according to the text line of document images. First, it used adaptive thresholding algorithm to segment the document image, and clustered connected components into text lines with morphology closing algorithm. Then, it used second order polynomial to fit the central line of text line, and constructed the object function of lens distortion. It warped the curved text line to the straight text line, thus, to solve the distortion parameters of document image. The experimental results show this mathod can effectively correct lens distortion of document image with various degrees.