CHEN Tao, LI Jian-ping, XING Sheng etc. Filtering of UV images of UV-Vis dual-band imaging system[J]. Editorial Office of Optics and Precision Engineering, 2017,25(10s): 325-331
CHEN Tao, LI Jian-ping, XING Sheng etc. Filtering of UV images of UV-Vis dual-band imaging system[J]. Editorial Office of Optics and Precision Engineering, 2017,25(10s): 325-331 DOI: 10.3788/OPE.20172513.0325.
Filtering of UV images of UV-Vis dual-band imaging system
In order to reduce image noise and improve registration accuracy in visible and UV image registration of UV-Vis dual-band imaging system
a UV image filtering algorithm based on correlation operation was designed. Firstly
the type of noise was confirmed by analyzing sources and characteristics of UV image noise. Then
correlation operation was completed between UV image and a continuous mask
and the noise was eliminated through a suitable threshold. Finally
the algorithm was verified by comparing the result of correlation filtering and other filtering methods
and the effect of the correlation filtering algorithm was further verified by detecting the corner feature of calibration board in UV image. The experiments prove that the peak signal to noise ratio(PSNR) of filtered UV image is 45.31 dB by correlation filter
and it's running time is 0.57 s measured by matlab. Furthermore
the corner feature of calibration board in UV image was detected throughly by Shi-Tomasi algorithm. Therefore
the correlation filter can eliminate the noise of UV image with high-speed and less pixel loss
which can satisfy the requirement of high accuracy image registration.
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references
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