数字图像的位相漂移现象研究

Experimental Studies on Phase Drift of Digital Image

本文详细报导了笔者对数字图像的位相漂移现象所做的实验研究 ,其中提出了位相漂移的 Harr小波变换探测方法。实验表明 :经 CCD Camera和图像卡采集的数字图像序列中存在着低频的图像抖动 ,即位相漂移。而且不同的 CCD Camera具有不同的漂移特点和程度 ,甚至在同一个图像行内的漂移也不完全一致。一般在图像行内相近的位置之间 ,位相漂移有明显的相关性 ,不同的图像行之间的漂移的程度相同 ,但没有相关性。

The experimental studies on the phase drift of digital image are reported,and a detecting method of phase drift based on Harr wavelet transform is presented.The experiment shows that,there is phase drift of low frequency in the digital image seriel acquired by CCD camera and frame grabber,different CCD has different drift characteristic and level;the phase drifts are not identical even in the same image line,the phase drift of neighboring locations in an image line has distinct correlation;the drift levels of different image lines are equal,but have no correlation.In addition,a method of phase drift eliminating is proposed in this paper.