大视场线阵CCD图像灰度均匀化

Gray Uniformity of the Wide Field Line CCD Image

针对大视场线阵CCD图像不均匀现象,提出了一种基于图像像素灰度补偿的均匀化方法。首先分析并计算线形目标上不同坐标位置的微小面元在线阵CCD上产生的辐射照度,并由此推导线阵CCD面元上不同像素灰度值与中心像素灰度值之间的关系,进而建立大视场线阵CCD像面上像素的灰度补偿模型,实现大视场线阵CCD图像快速均匀化的目的。对大量线阵CCD采集的高速路面图像进行了处理,结果表明我们提出的方法具有较强的可行性、鲁棒性和实用性。

For the non-uniformity of wide field line CCD image, a uniform method based on image pixel gray value compensation is introduced. The radiation luminosity of line CCD is calculated, which is developed by the micro-area of different coordinate in the line object. Then the relation between pixel values of the center place and the other place is induced. In order to accomplish the uniform of large field line CCD image, the model of gray value compensation is built. A plenty of pavement images captured by large field line CCD are processed by the proposed method. The results show that the method is of great flexibility, robustness and applicability.