摘要
给出两帧图像“亚象元”成像系统的调制传递函数 ,由此分析得出 ,这种技术将采样频率提高 1.4倍 ,适用于探测器占孔比接近 1,按照“亚象元”数字图像的特征 ,进行三种不同插值方法的研究。模拟“亚象元”成像证明 ,两帧图像“亚象元”技术能使图像的空间分辨率提高 1.3 3倍 ,再经过插值处理后 ,图像的空间分辨率进一步提高 ,接近于 2倍的理论值 ,图像质量略逊于四帧图像的亚象元级像。以一块分辨率板作为目标物的实验研究表明 ,两帧图像的“亚象元”成像 ,配合去卷积、图像增强以及插值等数字图像处理 。
The Modulation Transfer Function(MTF)for the subpixel system of composing two images is given.it shows that the sampling frequency increases by1.4 times in this system.And the subpixel technology of composing two images can be empolyed in remote sensor,that the duty ratio of the detector is near 1 and the optical cut-off frequency is little lower than the detector cut-off frequency.According to the digital trait of the subpixel images,the investigation of three interpolation models is carried out.The subpixel image simulations show that the spatial resolution of subpixel images is improved by 1.33 times,and the resolution increases farther to 2 times after the interpolation.The experimental research on Subpixel Technology is carried out too,using a distinguishability board as the object.After the image processing including the image adjusting ,deconvolution and interpolation,the spatial resolution of image is improved.
出处
《激光杂志》
CAS
CSCD
北大核心
2004年第6期54-56,共3页
Laser Journal
关键词
亚象元
空间分辨率
遥感
插值
subpixel
spatial resolution
remote sensing
interpolation
