在不同的应用环境下，电能表液晶屏不同区域存在明暗差异，对坏点检测产生干扰，导致坏点检测效果较差。针对该问题，开发了一种IR46电能表液晶屏的坏点视觉检测方法。将电能表内的液晶屏处理为空间范围内的二维矩阵，配准IR46电能表液晶屏像素点，采用傅里叶变换数值关系处理配准得到的像素点；设定坏点目标检测回归数值，构建坏点检测窗口；对图像进行傅里叶变换，基于DOC原理构建坏点检测滤波器模型，完成图像的坏点视觉检测。实测结果表明，所设计的坏点检测方法受到的漏光干扰最少，检测得到的坏点数量与实际的坏点数量基本一致，检测效果较好。

In different application environments, there are light and dark differences in different areas of the LCD screen of the electric energy meter, which interferes with the detection of dead pixels, resulting in poor detection of dead pixels. Aiming at this problem, a visual detection method for dead pixels of IR46 electric energy meter LCD screen is designed. The LCD screen in the electric energy meter is processed into a two-dimensional matrix within the space range, and thus the pixel points of the LCD screen of the IR46 electric energy meter are registered, and the registered pixel points are processed by using the Fourier transform numerical relationship, and the regression value of the dead point target detection is set up. Through building a dead pixel detection window and performing Fourier transform on the image, a dead pixel detection filter model based on the DOC principle was built and the image visual detection of dead pixels was completed. The measured results show that the designed dead pixel detection method suffers the least interference from light leakage, the number of detected dead pixels is basically the same as the acquired number of dead pixels, and the detection was shown very effective.