光纤锥耦合CCD相机图像的平场校正方法
Flat-field-correction method for image taken by a fiber optic taper coupled CCD camera
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摘要: 对于光纤锥或光纤面板耦合的CCD相机所获图像中存在的响应非均性问题进行了阐述,分析了CCD相机输出信号的构成情况和图像传递间的响应关系,并给出了相应的表达式。利用平场校正方法对存在较严重非均性的图像进行了处理,处理过程分为三步：首先获取系统的暗本底图像（包括了暗电流及系统偏置），所选择的积分时间与被用来校正的图像的积分时间相同；其次，获取均匀光场的图像，并将其作为平场校正的参考图像；最后扣除本底，用相对标定的方法对图像进行校正，从而获得图像各像素响应率的相对标定系数，再用它对原始图像进行平场校正即可获得很好的结果。校正后的图像更清晰，噪声更小，很多细节都能在灰度图像中直接看出，经过边界处理和伪彩显示后可清晰地看到小于0.1mm的细缝，达到了图像精密处理的效果。Abstract: Image taken by a fiber optic taper coupled CCD camera system characterizes the great difference among its pixels responsivity. This difference will obviously degrades image quality and makes it difficulty to get a clear image. The flat field correction method especially for the system mentioned above is a very useful method to get a better clear image. The flat field correction method includes three steps:1.A black background image is firstly obtained from such a system under the certain temperature and integration time; 2.The image which will be treated as a reference image for flat field correction should be taken under uniformity irradiation as possible and the same temperature and integration time;3.Subtracting the black background image from the reference image will obtain an importan
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