中文摘要：

观测距离和紫外成像仪的增益会影响到紫外成像仪的检测结果．笔者根据放电紫外成像仪的工作原理，利用数字图像处理算法分割提取了紫外图像中放电光斑区域，定义了“光斑面积”参数，利用该参数用于量化放电。研究了棒一板间隙电晕放电时的紫外图像，得到了光斑面积与紫外成像仪的观测距离、仪器增益两者之间的关系曲线并进行了理论上的分析。研究表明光斑面积与距离之间近似为平方反比关系，光斑面积与增益之间近似为指数关系，论文的研究结论为放电的量化提供了一种新的量化参数。

英文摘要：

Observing distance and gain affect the detection result of an ultraviolet （UV） imaging device.According to the working principle of UV imaging device, the facular region of discharge in a UV image was extracted segmentally with the digital image processing algorithm in this study, and a parameter, facular area, was defined to quantify discharge intensity. The UV image of corona discharge at rod-plate gap was analyzed, and the relation curves of facular area with UV imaging device＇s observing distance and gain were obtained. Approximate inverse relation between the facular area and the square of observing distance as well as approximate exponential relation between the facular area and the gain were observed. This study may provide a new quantitative parameter for corona discharge quantification.