Think in ISP(image sensor pipe )之How to implement an effecitive AE
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How to implement a effecitive AE.
AE(自动曝光)
1)try Minual exposure //time,line
2)try Max exposure
//average target help to control it.
3)change gain
get Range
what is Minimal gain
when set Max gain:
what is reasonable gain // Upper bound://SNR influenced
4)(first gain or first exposure )Adjust sequence:
a)Change dark
b)Change brighten
5)Adjust step:
a)Fixed step
b) Direct change:(init flicker)(解决方法待仪)
6)Detail:
Standard:(target average illuminace keep stable)
满足亮度直方图的分布
7)Optimization
Threshold:窄threshlod进,宽threshold出。
其他 点滴:
你知道格式RAW.YUV吗?
Auto control 建立在统计之上进行调整,基础也是 Manual调整;
尺寸变化上,scale 是等比例变化,dcw可以单个方向缩小。
速度可以通过Change pll达到。
常见的曝光窗口或对焦窗口公式是:winWidth+2*left=sensor width..//里面拆分的window width计算
再小的曝光时间都是1/30秒,满足能量守恒。更小的有其他机制保证。
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