SFR（Spatial Frequency Response）
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Raw压缩效果分析
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Pure Video Pipeline
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Calib模块
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EIS Pipeline
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OV48C双原生ISO配置方法
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MTF（Modulation Transfer Function）
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ISP 之 AF
对焦和变焦
对焦
对焦（聚焦）就是把成的像准确的落在 sensor（camera 传感器）上，对焦有两种：自动对焦，手动对焦。
虚线是 sensor 的位置，当虚线落在像的位置上就是对焦完成。
变焦
光学变焦：就是改变透镜的焦距。由于改变了焦距，视场角也就变了，就可以实现拉近拉远的功能。
数码变焦：数码变焦过的的图像会出现失真，因为放大的过程会对图像进程插值。
反差对焦 CDAF(Contrast Detection Auto Focus)
光路结构比 PDAF 简单很多。它不需要额外的光学棱镜，不需要微透镜，也不需要额外的电路构造。它用软件算法直接分析 sensor 捕捉的主图像就可以判断图像是否聚焦良好。
原理
CDAF 对一个图像序列进行分析，找到对比度最大的一帧图，这个方法也叫做最大值法（maximum-seeking method）。
最大值法的优缺点都很明显。其优点是仅需要考虑聚焦点附近一个小区域的像素，因此计算压力比较小，对于手持应用可以节省功耗。其缺点是需要抓拍多帧图像。如果只给一帧图像，CDAF 算法无从知晓当前图像是否聚焦良好，也不知道距离理想的聚焦位 ...
IQ调试
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ISP相关流程架构
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