missing line meaning in English

丢失线
漏纱

The algorithm of making up missed lines for imperfect line drawing
不完整立体线图的补线算法
An efficient method for completing the imperfect line drawing through adding the missing lines and deleting the false ones is proposed . and for the sake of simple operation in computer , several operation modules and the flow are proposed
为了有利于计算机对线画图的有效分析和处理，给出了计算机处理不完整线画图的操作流程，研制了相应的几个操作模块。
But in fact , the lines are not linked in the line drawing we extracted from the projected image in many cases , thus the labeling could not be progressed farther , and be not interpreted and recognized objects the projected image denoted . in this thesis , we mainly study the method for deleting the false lines and adding the missing lines in an imperfect line drawing , and make the imperfect line drawing into a perfect
不少学者对线画图的标记理论和方法都进行了深入研究，提出了各种标记方法，但是在实际情况中，从图像得到的物体的线画图，因提取方法等的原因，线条不能正确连接，常常存在缺线或多线等现象，这样就使得线画图的标记无法进行下去，从而就不能正确解释和识别图像所表示的物体。