回复: openmv 怎么自动曝光？
那如何能调整自动曝光的参数 实现自己想要的效果呢？

@rdig 在 如何自动调整曝光时间 使得光源在不同的亮度条件下产生的效果都是一样的 中说：

这里

光源不论多强都能实现下面那张图的效果

请在这里粘贴代码

Template Matching Example - Normalized Cross Correlation (NCC)

This example shows off how to use the NCC feature of your OpenMV Cam to match

image patches to parts of an image... expect for extremely controlled enviorments

NCC is not all to useful.

WARNING: NCC supports needs to be reworked! As of right now this feature needs

a lot of work to be made into somethin useful. This script will reamin to show

that the functionality exists, but, in its current state is inadequate.

import time, sensor, image
from image import SEARCH_EX, SEARCH_DS
from pyb import UART
import json
#从imgae模块引入SEARCH_EX和SEARCH_DS。使用from import仅仅引入SEARCH_EX,
#SEARCH_DS两个需要的部分，而不把image模块全部引入。

Reset sensor

sensor.reset()

Set sensor settings

sensor.set_contrast(1)
sensor.set_gainceiling(16)

Max resolution for template matching with SEARCH_EX is QQVGA

sensor.set_framesize(sensor.QVGA)

You can set windowing to reduce the search image.

#sensor.set_windowing(((640-80)//2, (480-60)//2, 80, 60))
sensor.set_pixformat(sensor.GRAYSCALE)

#加载模板图片
sensor.skip_frames(10) # Let new settings take affect.
sensor.set_auto_whitebal(True) # turn this off.
sensor.set_auto_exposure(False,
exposure_us = 37945)

sensor.set_auto_gain(True, gain_db_ceiling = 7.0) # Default gain.

clock = time.clock() # Tracks FPS.

while (True):
clock.tick()
img = sensor.snapshot()
print(clock.fps(),sensor.get_gain_db())

openmvide如何能根据环境来自动改变曝光时间，而不是手动修改曝光时间。