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1. 中国科学院 研究生院 北京,100039
2. 中国科学院 长春光学精密机械与物理研究所,吉林 长春 130033,E-mail:yunhan0502@gmail.com
收稿日期:2010-01-08,
修回日期:2010-02-08,
网络出版日期:2010-09-28,
纸质出版日期:2010-10-20
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赵变红, 何斌, 杨利红, 王文华, 禄金波. TDI-CCD图像固有条带噪声的消除方法及实现[J]. 液晶与显示, 2010,25(5): 752-758
ZHAO Bian-hong, HE Bin, YANG Li-hong, WANG Wen-hua, LU Jin-bo. Methods and Realization for Removing Inherent Stripe Noises in TDI-CCD Images[J]. 液晶与显示, 2010,25(5): 752-758
存在于TDI-CCD图像中的条带噪声会影响图像的质量
降低系统的测量精度。针对TDI-CCD图像固有条带噪声的灰度值在原始信息中变化比较缓慢的特点
利用傅里叶变换域内的频谱图映射确定条带噪声频率的方法
分别采用低通、带阻滤波器对条带噪声进行消除。另外
提出了一种改进阈值的小波变换法来消除条带噪声
该方法能在小波分解后各个尺度的垂直方向上自适应地确定阈值。实验结果表明在消除条带噪声方面
改进阈值的小波变换法优于传统的傅里叶变换法。在整个频率域内
改进阈值的小波变换法能够较彻底地消除条带噪声
同时较好地保持了原图像的特征。
The existence of stripe noises influences the qualities of TDI-CCD images
and reduces the measurement accuracy of the system simultaneously. For the characteristic of slow change of the stripe noisesgrey level compared with the primary information
the stripe noises are eliminated via low-pass filter and band-elimination filter separately using the method of determining the stripe noise frequency through the frequency spectrum mapping in the Fourier transform domain. Moreover
an improved threshold of Wavelet Transform method of eliminating stripe noise is presented in this paper. The each vertical directions threshold in various scales is determined by itself after the wavelet decomposition. It is proved that in removing the TDI-CCD stripe noises
the improved threshold of Wavelet Transform is better than the traditional Fourier Transform. The stripe noises can be removed drastically via the improved threshold of Wavelet Transform method
the goal which reserves the spectral characteristic of original image is also achieved.
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Online Computer Library Center,Inc.History of OCLC . . http: //www.oclc.org/about/history/default.htm. 2.文后参考文献应在正文中引用该文献处进行标注。3.关于作者姓名,姓在前,名在后(拉丁文只用缩写);作者3人以下应全部列出,4人以上仅列出前3人,其后加"等"(外文加"et al")。4.注意参考文献标注的标点符号、次序,并不得缺项。5.参考文献著录不规范的有可能影响文章的录用。注:文献类型和电子文献载体标志代码:
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