凸面光栅成像光谱仪图像数据实时压缩技术

A Technology of Real-Time Image Compression for Convex Grating Imaging Spectrometer

凸面光栅成像光谱仪图像数据量巨大,给数据的传输和存储带来了压力,因此要对图像数据进行实时压缩。首先根据成像原理对图像数据的特点进行了分析,得出去除空间相关性和谱间相关性的压缩途径;然后,进行了压缩算法分析,提出了在谱间进行一阶线性预测、谱内进行JPEG2000压缩的三维压缩方案;最后,设计了基于FPGA+ADV212的实时压缩系统,其中FPGA用于逻辑控制和预测算法实现,ADV212用于JPEG2000压缩。分析结果表明:该系统具备无损和有损压缩能力,能够实现图像数据实时压缩。

The huge amount of convex grating imaging spectrometer image data brings much pressure to data transmission and storage, so the image must be compressed in real time. Firstly, the image characteristics were analyzed according to the imaging principle, and the compression approach to removing spatial correlation and spectral correlation was achieved; Secondly, the compression algorithms were analyzed and the 3D compression scheme of oneorder linear compression in spectral dimension and JPEG2000 compression in spatial dimension was proposed. Finally, a realtime compression system based on FPGA and ADV212 was designed, in which FPGA was used for logic control and implementation of prediction algorithm, and ADV212 was used for JPEG2000 compression. The analysis result shows that the system has the ability of lossless and lossy compression, enabling realtime image compression.