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 ...
IQ调试
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ISP相关流程架构
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Camera框架梳理
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RAW 压缩详解
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