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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 is a new direction in space optical remote sensing imaging. However, the resolution of terahertz imaging is limited by the level of device processing and manufacturing process. In order to improve the image resolution of terahertz imaging, an image processing method for improving terahertz over-sampling imaging is proposed. Firstly, the multi-channel observations are made on the target in the terahertz band after being dislocated; then, the norm-optimized constrained and enhanced filter is applied to the multi-channel observed terahertz image; finally, the norm-optimized constraint and the filtering enhancement After the multi-terahertz images reconstructed into a higher resolution images. Experiments show that this method can effectively improve the edge continuity of the target while suppressing the background noise. Judging from the image quality evaluation index, the proposed method can enhance the image quality compared with the traditional method to enhance the effective details of the image.