线阵CCD图像特点及识别算法适应性研究

Characteristic of Linear CCD Image and Its Applicability of Identify Arithmetic

针对线阵CCD扫描图像识别精度难以提高的问题,深入分析了扫描运动对图像质量的影响,指出行距不均匀和扫描位置重复性差是影响识别精度的关键因素,在此基础上,提出了沿像元排列方向搜索边缘点,用曲线拟合识别圆心坐标的方法,避免了扫描行距对识别的影响,实验证明,该方法有效可行,识别精度可达亚像素级。

Aimed at the problem that it＇s difficult to improve the identify precision of the linear CCD scan image, the influence of scan movement on image quality is deeply analyzed,and the key reason resulting in the bad identify precision is pointed out,i, e. , non uniform spacing and the bad repetition of scan location. Based on that, the methodto search the ity of row edge spot along the pixel array orientation and to identify the coordinate of the circle center by curve fitting is proposed. This method avoided the influence of scan row spacing on identify precision. It is testified that this method is efficient and the identify precision can arrive at sub-pixel level.