SFRplus汽车测试图卡鱼眼测试图卡预失真测试卡

预失真：大多数汽车相机模块具有显著鱼眼失真功能可以检测难以看见的外部像场。这个测试图卡具有测量针插预失真大约的汽车照相机模块的桶扭曲补偿。

方形网格：5×7的斜方形网格

基材油墨类型：磨砂纸和油墨减少反射光。这是高水平的失真测量至关重要，否则镜面反射可以毁掉MTF测量。

测量

对比度：10:1的对比度，这是常见几种汽车测试标准之一。

彩色图卡：20块颜色图对颜色的准确性和拜尔过滤器的位置进行测量。

活动区域：超大图用于超过24MP的传感器。此图的活动区域为36x50英寸，打印纸张为44x60英寸。

SFRplus汽车测试图卡鱼眼测试图卡预失真测试卡

Options include:

Pre-distortion:  Most automotive camera modules have significant fisheye distortion which can make it difficult to the outside of the image field. this chart has pincussion pre-distortion to approximay compensate for the barrel distiortion of the automotive camera module. The distortion coefficients that should be entered into the Imatest SFRplus settings window are [1.167 1.577]

Square Grid: 5x7 slanted square grid 

Substrate & ink type: Matte paper & ink can be used to reduce reflected light. This is critical for high levels of distiortion, otherwise specular reflections can ruin MTF measurements

Contrast levels: 10:1 contrast ratio, common for several automative testing standards

Color chart: a 20 patch color chart for color accuracy and bayer filter position verification

Bar to Bar height:  the maximum bar to bar height is 38.5 inches on the left and right side.  The minimum bar to bar height is 23.5 inches in the center.

Active Area: the extra-large chart be used for sensor sizes above 24 MP. This chart has an active area of 36 x 50 inches and is printed on 44 X 60 inch paper

The active area of the chart includes white space above and below the top and bottom distortion bars. It is slightly larger than the printed area, which is bounded by the distortion bars on top and bottom. White space is included in active area because test images of the chart must include this white space in order to enable automated processing in SFRplus software.