Improvement method for terahertz imaging quality
太赫兹成像是空间光学遥感成像领域的新方向, 然而太赫兹成像分辨率受到器件加工和制造工艺水平限制。为了提高太赫兹成像的图像分辨率, 提出一种改善太赫兹过采样成像的图像处理方法。首先, 对响应在太赫兹谱段的目标进行错位观测形成多路观测结果; 然后, 对多路观测的太赫兹图像进行范数优化约束和增强滤波; 最后, 将经过范数优化约束和滤波增强后的多路太赫兹图像重构成一幅分辨率更高的图像。实验证明: 这种方法能够在抑制背景噪声的同时, 有效提高目标边缘连续性。从图像质量评价指标上看, 所提方法相较于传统方法能提升图像的有效细节信息, 进而增强图像质量。
Terahertz imaging was new trend of space optical remote sensing imaging field. However, the resolution of terahertz imaging was difficultly raised, restricted by current level processing and manufacturing technology. The improvement method for terahertz imaging quality was presented to raise the quality of terahertz image. Firstly, the multi-observation stagger terahertz images were received, the target spectrum response ranges was terahertz. Then, the multi-observation images were norm optimization constrained and filtering enhanced. Finally, the higher resolution of terahertz image was reconstructed by multi-observation low resolution original terahertz images. The experimental result showed that target edge was more continuous after being processed by the proposed method. Besides, the background noise on original low resolution Terahertz image was constrained. The evaluation index of image quality was increased, which meant that the proposed method is better than conventional methods. The detail information of processed image was enhanced and then quality of the original terahertz image was improved.
林栩凌：北京空间机电研究所, 北京 100094
张建兵：中国科学院上海应用物理研究所, 上海 201800
何红艳：北京空间机电研究所, 北京 100094
备注：张智(1978-), 男, 高级工程师, 博士, 主要从事模式识别与智能图像处理、新型光学遥感器设计及在轨数据处理、信息处理新方法的研发等方面的研究工作。
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