Think in ISP(image sensor pipe )之How to implement an effecitive AE
How to implement a effecitive AE.
AE(自己主動曝光)
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)(解決方法待儀)
6)Detail:
Standard:（target average illuminace keep stable）
滿足亮度直方圖的分布
7)Optimization
Threshold:
其它 點滴：
你知道格式RAW.YUV嗎？
Auto control 建立在統計之上進行調整，基礎也是 Manual調整；
尺寸變化上，scale 是等比例變化。dcw能夠單個方向縮小。
速度能夠通過Change pll達到。
常見的曝光窗體或對焦窗體公式是：winWidth+2*left=sensor width..//裏面拆分的window width計算
再小的曝光時間都是1/30秒。滿足能量守恒。
更小的有其它機制保證。
Think in ISP(image sensor pipe )之How to implement an effecitive AE