线阵CCD配合转台使用, 实现周向图像采集是一种常见方式, 具有扫描范围大、分辨率高的优点, 但也存在刷新率低的短板。采用两个线阵CCD同时扫描方式可有效提高刷新率, 但对图像一致性又带来较高要求。影响双线阵CCD图像一致性的因素主要包括CCD成像非均匀性、图像视场配准程度和图像灰度匹配性, 文中围绕双线阵CCD图像灰度匹配性, 提出了一种图像灰度匹配的在线校正方法, 重点解决转台承载的双线阵CCD光圈实时调整问题, 并通过实验验证了此方法的可行性, 可在工程中普及应用。

Using linear charge-coupled device (CCD) with turntable is a common way to achieve circumferential image acquisition, which has the advantages of large range of scanning and high resolution, but with the shortcoming of low refresh rate. It can effectively increase the refresh rate by double linear CCD simultaneously scanning mode, but it requires a higher image consistency. The element to effect image consistency of the double linear CCD includes imaging heterogeneity, the registration degree of image field and image grey matching. An on line correction method to match the image grey of the double linear CCD is proposed to solve the problem of aperture adjustment at real time of the double linear CCD on the turntable. And the feasibility of the method is verified by experiments, which can be popularized in project engineering.