How to implement an effecitive AE of Think in ISP (image sensor pipe)

How to implement a policitive AE.

AE (automatic exposure)

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) (solution pending)

 

 

6) Detail:

Standard :( target average illuminace keep stable)

Distribution that satisfies the brightness histogram

 

7) Optimization

Threshold: narrow threshlods and wide threshold output.

 

 

Others:

 

Do you know the RAW. YUV format?

Auto control is adjusted based on statistics and Manual adjustment;

In terms of size changes, scale is an equal proportional change, and dcw can be reduced in a single direction.

The speed can be achieved through Change pll.

The common formula for the exposure window or focus window is winWidth + 2 * left = sensor width .. // calculate the split window width.

The minimum exposure time is 1/30 seconds, meeting the conservation of energy. There are other mechanisms to guarantee a smaller value.

How to implement an effecitive AE of Think in ISP (image sensor pipe)