摘要
为获取以及充分利用场景的多波段信息,同时为多波段图像算法研究奠定基础,基于非制冷红外焦平面阵列,研制了共光轴分束的可见光+近红外、短波红外、中波红外和长波红外四波段光电成像实验平台。给出了基于四波段光电成像实验平台的图像处理案例,使用现场可编程门阵列完成各路图像的预处理与多波段图像融合。预处理过程主要包括可见光机芯盲元校正以及基于梯度域滤波的中、长波红外机芯的低频非均匀性校正,从而优化各波段的图像质量。双波段和四波段图像融合采用色彩传递的方式对YUV颜色空间中线性组合融合的图像进行色彩增强,得到更佳的自然感彩色融合图像的同时保证了算法的运行效率。使用中、长波红外进行双波段红外测温,室内黑体实验表明,在20~80℃内双波段测温的准确度明显高于单波段测温,双波段测温误差小于3.5%,单点温度波动幅度小于0.7%。外场实验结果表明,信息融合图像能有效增强人眼对场景信息的理解。四波段光电成像实验平台能够获得场景的四波段信息,经过图像融合与双波段测温加强了对场景信息的理解。
To obtain and make full use of the multi-spectrum information of the scene,and to lay the foundation for the research of multi-band image algorithms,a four-band coaxial imaging experimental platform of visible light+near infrared,short wave infrared,mid-wave infrared and long-wave infrared was developed based on uncooled infrared focal plane array(IRFPA).Image processing cases based on the fourband imaging experimental platform were presented.FPGA was used in the preprocessing of each channel of image and the fusion of multi-band image.The image quality of each band was optimized by the preprocessing procedure,that included the blind point correction of the visible sensor and nonuniformity correction of the mid-wave and long-wave infrared sensors based on grad-filtering.Dual-band and four-band im age fusion enhanced the color of the fusion image obtained by linear combination in the YUV color space by color transfer,thus resulting in a natural color fusion image as well as ensuring the operating efficiency of the algorithm.Dual-band infrared temperature measurement was performed using medium and longwave infrared.The blackbody experiment shows that in the temperature range of 20-80℃,the accuracy of dual-band temperature measurement is significantly higher than that of single-band temperature measurement,the error of dual-band temperature measurement is less than 3.5%,and the single-point temperature fluctuation range is less than 0.7%.The outfield experiment results show that information fusion im ages can effectively enhance the human eye’s understanding of scene information.The four-band imaging experimental platform can easily obtain the four-band information of the scene,and image fusion and dualband temperature measurement can strengthen the understanding of scene information.
作者
刘志豪
金伟其
李力
沙漠洲
郭勤
LIU Zhihao;JIN Weiqi;LI Li;SHA Mozhou;GUO Qin(MoE Key Lab of Photoelectronic Imaging Technology and System,Shool of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China;Beijng Electro-Mechanical Engineering Institute,Beijing 100074,China)
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2022年第1期1-11,共11页
Optics and Precision Engineering
基金
精导十三五重点预研项目(No.41415020102)
国家自然科学基金资助(No.61871034)。
关键词
光电成像
多波段成像
非制冷红外焦平面阵列
图像融合
双波段红外测温
photoelectric imaging
multi-band infrared imaging
un-cooled infrared focal plane array(IRFPA)
image fusion
dual-band temperature measurement
