https://book.openmv.cc/example/21-Sensor-Control/sensor-vertical-flip.html

https://book.openmv.cc/example/21-Sensor-Control/sensor-exposure-control.html

set_auto_exposure

可以
https://book.openmv.cc/example/21-Sensor-Control/sensor-exposure-control.html

http://book.openmv.cc/example/21-Sensor-Control/sensor_manual_whitebal_control.html

sensor可以手动控制

import sensor 这个sensor的源路径在什么地方？

# Sensor Sleep Mode Example.
# This example demonstrates the sensor sleep mode. The sleep mode saves around
# 40mA when enabled and it's automatically cleared when calling sensor reset().

import sensor, image, time

sensor.reset()                      # Reset and initialize the sensor.
sensor.set_pixformat(sensor.RGB565) # Set pixel format to RGB565 (or GRAYSCALE)
sensor.set_framesize(sensor.QVGA)   # Set frame size to QVGA (320x240)
sensor.skip_frames(time = 3000)     # Capture frames for 3000ms.
sensor.sleep(True)                  # Enable sensor sleep mode (saves about 40mA).

import sensor, time, image

# Reset sensor
sensor.reset()

# Sensor settings
sensor.set_contrast(3)
sensor.set_gainceiling(16)
sensor.set_framesize(sensor.QQVGA)
#sensor.set_windowing((320, 240))
sensor.set_pixformat(sensor.GRAYSCALE)

但是这样子它都不画出特征点了

参数要加exposure_us=
参考：
https://book.openmv.cc/example/21-Sensor-Control/sensor-exposure-control.html

看上去是sensor坏了，或者是没有安装sensor就启动。

https://book.openmv.cc/example/21-Sensor-Control/sensor-exposure-control.html

最开始的EXPOSURE_TIME_SCALE = 1.0改为0.1