利用积分球对CCD线性和面均匀性的标定

积分球对CCD(Charge-coupled Device)的标定,主要是利用积分球光源具有较好的均匀性、稳定性以及精度高的特点,通过CCD采集积分球光源的图片,将积分球光源亮度转换为CCD拍摄图像的灰度,通过对采集图片灰度信息的提取,得出了CCD标定的各项参数。CCD线性标定试验的结果表明:在CCD快门值固定时,光源亮度的变化和图像灰度呈线性关系,并且在转换后的不同灰度值区段,线性度有一定的差别:在中值区,线性度最好,低值区次之,高值区最差;在光强一定的情况下,CCD快门值的改变和采集图像的灰度也呈线性关系。均匀性标定的试验结果表明:CCD的光电响应的非均匀性是随着快门值和灰度的增加而减小的,但最终趋于一个较稳定的值。

Integrating Sphere Calibration of CCD Linear and Surface Uniformity

Integrating sphere calibration of the CCD（ Charge-coupled Device） makes the use of an integrating sphere light source,as it has a good uniformity,stability and high accuracy. CCD is used to capture images of the integrating sphere light source,the integrating sphere light source brightness is converted into image gray scale. Then the parameters of CCD calibration is obtained by extracting the data of gray scale images. CCD linear calibration test results show that： when the value of the CCD shutter is fixed,the light brightness changes in linear relation with image gray,and the linearity is somewhat different in different gray scale value regions after the conversion. Linearity of the median value region is the best,low value region is second,and high value region is the worst. With some fixed light intensity,shutter changes of CCD are linear with image gray scale. The uniformity calibration test results show that： non-uniformity of CCD photo response decreases with increasing of shutter and image gray,but eventually becomes a more stable value.