数字域斜模态时间延迟积分技术

发布时间：2019-07-12 19:39

【摘要】：为了实现遥感图像超分辨目的,提出数字域斜模态时间延迟积分(Digital Domain Tilting Model Time Delayed and Integration,DT-TDI)技术。对技术过程所涉及的数字域TDI技术、倾斜采样成像理论、数字域斜模态TDI技术等分别进行分析与研究。首先,构建通用的数字域TDI模型。之后,利用倾斜采样成像思想,构建适用于不同倾斜角度下的DT-TDI模型。然后,以45°倾角对模型进行实验验证,获取该角度一定姿轨条件下的序列低分辨率图像。最后,通过超分辨算法对具有亚像素位移的低分辨率图像序列进行超分辨重构,获取高分辨率图像。实验结果表明,DT-TDI技术可在不同倾斜模态下进行稳定成像,45°倾角时获取的低分辨率图像亚像素位移误差约15%,基本满足超分辨重构需求。重构后图像分辨率明显提升。
[Abstract]:In order to realize the purpose of super-resolution of remote sensing image, a digital domain oblique modal time delay integral (Digital Domain Tilting Model Time Delayed and Integration,DT-TDI technique is proposed. The digital domain TDI technology, oblique sampling imaging theory and digital domain oblique mode TDI technology involved in the technical process are analyzed and studied respectively. First of all, a general digital domain TDI model is constructed. After that, the DT-TDI model suitable for different tilt angles is constructed by using the idea of tilt sampling imaging. Then, the model is verified by 45 掳inclination angle, and the sequence low resolution images with a certain attitude and orbit are obtained. Finally, the super-resolution algorithm is used to reconstruct the low-resolution image sequence with sub-pixel displacement, and the high-resolution image is obtained. The experimental results show that the DT-TDI technique can perform stable imaging under different tilt modes, and the subpixel displacement error of the low resolution image obtained at 45 掳inclination angle is about 15%, which basically meets the requirements of super-resolution reconstruction. After reconstruction, the image resolution is improved obviously.
【作者单位】：首都师范大学北京成像技术高精尖创新中心;中国科学院长春光学精密机械与物理研究所;中国科学院大学;
【分类号】：TP751

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