Taking images with different shutter settings i2c

Seka

Hi there,

I am trying to use the Starvis 327 RPI Mipi Camera with an RPI4B to take images with different illumination settings. For our use case, I need to change the shutter settings to adjust for different levels of light.

I tried to enable the "capture mode" in order to change the shutter settings but always get a kernel error when trying to do so.

Here is the script:

from time import sleep
from signal import pause
import datetime
import time
import RPi.GPIO as GPIO
import D_mipicamera as Dcam





import os
status = os.system('sh ./veye_mipi_i2c.sh -w -f videoformat -p1 PAL  -b 10')
status = os.system('sh ./veye_mipi_i2c.sh -w -f cameramode -p1 0x1 -b 10')
print status 




camera = Dcam.mipi_camera()


camera.init_camera()





#Folder CREATION

#os.makedirs("/home/pi/testmipi")
directory="/home/pi/testmipi/"


directory




sleep(2)
date = datetime.datetime.now().strftime("%m_%d_%Y_%H_%M_%S")
frame = camera.capture(encoding = 'jpeg')
frame.as_array.tofile((directory)+"nm385"+ date + ".jpg")
camera.release_buffer(frame)
del frame

time.sleep(1)


print("Close camera...")
camera.close_camera()
GPIO.cleanup(Alled)

The error I get is:

An error ocurred while starting the kernel
mmal: mmal_component_enable w 1920 h 1080

It works in stream mode, but node in capture mode...

But in stream mode it seams like i cannot change the shutter speed.

Seka

These are the 2c settings:

I2C Settings

Devid: 0x6
Hdver: 0x3
Wdrmode: 0x0
Videomode: frame rate reg 1, NTSC (60Hz)
Mirrormode: 0x0
Denoise: 0x5
AGC: 0x c
Lowlight: 0x 0
Daynightmode: 0xfc
Mshutter: 0x41
Cameramode: 0x0
Nodf: 0x0
CAPTURE  ????
Csienable 0x1
Brightness: NTSC60 brightness is 0x20
Agcspeed: agcspeed is 0x a shutter speed is 0x50
Contrast: 0x80
Saturation: 0x28
Sharpen : enable is 0x1 cal is 0x3
Wdrtargetbr: 0x30
Boardmodel: no information
I2cwen: no information
I2cauxenable: no information

veye_xumm

@seka

about capture mode:

http://wiki.veye.cc/index.php/VEYE-MIPI-290/327_i2c/#cameramode
Caputre mode: output the next frame each capture cmd.
You have to run the cmd below to get one picture.

./veye_mipi_i2c.sh -w -f capture -b 10

camera.capture(encoding = 'jpeg')
This function do CAPTURE one frame from the MIPI csi-2 port.

So I suggest add this cmd before capture a frame.

./veye_mipi_i2c.sh -w -f capture -b 10

Seka

@veye_xumm and then change the shutter with mshutter or with lowlight command?

Seka

@seka Sometimes I have the impression that the frame I get in the images is an old one. Can there be a problem with having "old" frames in the images?

veye_xumm

@seka
mshutter is manual exposure time.

veye_xumm

@seka said in Taking images with different shutter settings i2c:

an there be a problem with having "old" frames in the images?

Could you add a little sleep between mshutter cmd and capture cmd?

Seka

@veye_xumm OK, so accordin to your suggestion,
I now switched back to stream mode and discard one frame taken with the capture command before taking another one and saving it:

import D_mipicamera as Dcam


camera = Dcam.mipi_camera()


camera.init_camera()

import os
status = os.system('sh ./veye_mipi_i2c.sh -w -f cameramode -p1 0x0 -b 10')
print status 

status = os.system('sh ./veye_mipi_i2c.sh -w -f daynightmode -p1 0xFC -p1 0x00 -b 10')
#print status 


##turn off automatic exposure
status = os.system('sh ./veye_mipi_i2c.sh -w -f agc -p1 0 -b 10')
print status 
##turn off white balance
status = os.system('sh ./veye_mipi_i2c.sh -w -f wbmode -p1 0x1b -b 10')
print status 



status = os.system('sh ./veye_mipi_i2c.sh -w -f lowlight -p1 0x09  -b 10')
print status 

directory="/home/pi/testmipi/"

date = datetime.datetime.now().strftime("%m_%d_%Y_%H_%M_%S")
frame = camera.capture(encoding = 'jpeg')

camera.release_buffer(frame)
del frame
time.sleep(1)

frame = camera.capture(encoding = 'jpeg')
frame.as_array.tofile((directory)+"nm590"+ date + ".jpg")
camera.release_buffer(frame)
del frame

Now it is taking repeatedly and reliably the same images. That is good.

However, I feel like I am not in control of the shutter/ frame rate. I tried different framerate settings with *lowlight -p1 XX but nothing changed.

How can I change the exposure time now?

Seka

@seka Sorry, my bad, I can change the exposure now with the mshutter command.

THANK YOU for your help!

veye_xumm

@seka
It's really nice to know this. You are welcome.