数字域时间延迟积分(TDI)互补金属氧化物半导体(CMOS)成像以其成本低、功耗小、操作灵活等优势，近几年逐渐引起研究关注。然而CMOS传感器的卷帘快门存在运动失真，为了深入研究其对数字域TDI的影响，结合卷帘快门工作原理，建立了卷帘快门效应对数字域TDI引起的像移及调制传递函数(MTF)下降的数学模型。并结合推导模型开展了预估分析和验证实验。结果表明：卷帘快门效应会对数字域TDI算法带来较大的影响；读出时间越长像移量越大、MTF 下降越严重；另外行周期越短影响也越严重，其中行周期从200 us变为100 us时，对应的数字域TDI图像MTF从0.6144下降为0.4807。

Time delay and integration (TDI) in digital domain with the complementary metal-oxide-semiconductor (CMOS) sensor has low cost, low power consumption, flexible operation and other advantages, it has attracted much research attention in recent years. However, the rolling shutter of the CMOS sensor produces distortion for imaging on moving object. In order to study the impact of the rolling shutter on TDI in digital domain, the mathematical model of image motion and modulation transfer function (MTF) decline induced by the rolling shutter effect on TDI in digital domain is established, combining with the principle of the rolling shutter. And the estimation analysis and confirmatory experiment are carried out combining with the derivation model. The results show that the rolling shutter bring a large affect on TDI in digital domain; the image motion gets larger and MTF declines more serious as the readout time gets longer; in addition, the influence gets more serious as the line period gets shorter, when the line period goes from 200 us to 100 us, the corresponding MTF of the images generated by TDI in digital domain decreases from 0.6144 to 0.4807.