OECF 测试卡简介

　　OECF 测试卡TE197用于评估摄像机的光电转换功能。 测试卡由灰色背景上的圆形有序排列的12阶灰度块组成。

　　OECF测试卡TE270X图表类似于TE264，但它在测试卡的中心配备了两个偏振滤光片。对于不允许手动调节曝光的相机，通过修改测试卡中心部分的密度(透射率)可以改变自动曝光控制(AEC)。对于通常没有手动曝光调整的移动设备中的低端相机和相机模块需要此功能。

　　OECF测试卡TE270X D的规格来自ISO 14524。

　　OECF测试卡的标准版本使用筛选来形成灰度级。这可能导致高分辨率相机的图像中的噪声水平或伪像增加，这些图像可以解决拍摄，但是不能解决轻微散焦。 TE270X使用连续色调膜，因此不显示这些结构。

   　Introduction to OECF Test Cards

　　The OECF test card TE197 is used to evaluate the photoelectric conversion function of the camera. The test card consists of a rounded, ordered 12-order gray scale block on a gray background.

　　The OECF test card TE270X chart is similar to TE264, but it is equipped with two polarizing filters in the center of the test card. For cameras that do not allow manual adjustment of exposure, automatic exposure control (AEC) can be changed by modifying the density (transmittance) of the center of the test card. This feature is required for low-end cameras and camera modules in mobile devices that do not normally have manual exposure adjustments.

　　OECD test card TE270X D specifications from ISO 14524.

　　The standard version of the OECF test card uses a filter to form a grayscale. This may result in increased noise levels or artifacts in the image of the high-resolution camera, which can solve the shooting, but can not solve the slight defocus (such as a mobile phone). TE270X uses continuous hue film, so these structures are not shown.