UNSOLVED RAW-MIPI-SC53M maximum exposure length

[Izaak]

Hello, I am looking at the RAW-MIPI-SC53M 5MP camera module, and the documentation states the maximum exposure time is equal to 1/(max fps) which is less than 1 second. However, I would like to take long exposure images (up to 60 seconds exposure) - can this camera do that?

[veye_xumm]

@izaak In fact, in the Video streaming mode, it is impossible to achieve an exposure time of 1 second. I conducted a test in the 2 - lane raw8 format, as follows:

pi@raspberrypi:~/mvcamera/mv_tools_rpi $ ./mv_mipi_i2c_new.sh -w fps 0.01 
w fps 0.01
pi@raspberrypi:~/mvcamera/mv_tools_rpi $ ./mv_mipi_i2c_new.sh -r fps      
r fps is 3.48 fps
pi@raspberrypi:~/mvcamera/mv_tools_rpi $ ./mv_mipi_i2c_new.sh -w metime 1000000
w manual exp time is 1000000 us 
pi@raspberrypi:~/mvcamera/mv_tools_rpi $ ./mv_mipi_i2c_new.sh -r exptime       
r current exptime is 287129 us

It can be achieved in Pulse Trigger Mode. However, due to the excessive accumulated dark current, the signal noise will be very high. I don't think it has practical value.

[golden0514]

@veye_xumm 这种情况下如何采集图像，使用mv_mipi_i2c_new.sh可以设置曝光时间，但是如何采集，没有demo。

[veye_xumm]

@golden0514 你的嵌入式平台是什么？

[golden0514]

@veye_xumm 树莓派4b

[veye_xumm]

@golden0514
可以参考这篇文章进行取图。
https://wiki.veye.cc/index.php/Mv_series_camera_appnotes_4_rpi/zh

[golden0514]

@veye_xumm 按照这篇文章里修改曝光时间没有效果，设置成1或者255，采集的图像几乎不变。

[veye_xumm]

@golden0514 这篇文章没有修改曝光时间的东西吧？ 有设置格式，分辨率，帧率，取图相关的内容。

[golden0514]

@veye_xumm 刚才试过了，问题解决，最大曝光时间0.3″，基本够用了

[veye_xumm]

@golden0514 你可以进一步将fps设置小，相应的最大曝光时间也会拉长。