How to increase the exposure of MIPI camera in VIM3

XinnWang · August 11, 2021, 2:13pm

My working condition is inside a underground garage, which is darker than other cases. So i want to manually increase the exposure or increase gain of MIPI camera. I tried the following command

v4l2_test  -c 1 -p 0 -F 0 -f 0 -D 0 -R 1 -r 2 -d 2 -N 1000 -n 800 -w 0 -e 4 -I 1 -b /dev/fb0 -v /dev/video0

After running the command, the image becomes brighter shortly, then it goes dark as nothing changed.
I tried to change some parameters but the image is till dark as before.
How can i manually increase the exposure or gain ? Any documents for v4l2_test ? Thanks.

numbqq · August 12, 2021, 1:31am

You can check the source code here：

github.com

numbqq/arm_isp_amlogic/blob/master/v4l2_testapp/v4l2_test.c

//----------------------------------------------------------------------------
//   The confidential and proprietary information contained in this file may
//   only be used by a person authorised under and to the extent permitted
//   by a subsisting licensing agreement from ARM Limited or its affiliates.
//
//          (C) COPYRIGHT [2018] ARM Limited or its affiliates.
//              ALL RIGHTS RESERVED
//
//   This entire notice must be reproduced on all copies of this file
//   and copies of this file may only be made by a person if such person is
//   permitted to do so under the terms of a subsisting license agreement
//   from ARM Limited or its affiliates.
//----------------------------------------------------------------------------


/*
 * Apical(ARM) V4L2 test application 2018
 *
 * This is ARM internal development purpose SW tool running on JUNO.
 */

This file has been truncated. show original

XinnWang · August 12, 2021, 5:13am

I want to change wdr_mode for low light scenes. According to the code:

w : wdr mode          : 0: linear 1: native 2: fs lin

What is the meaning of ‘linear’, ‘native’, ‘fs lin’ ?

i tried the following command to change wdr_mode to 1

v4l2_test  -c 1 -p 0 -F 0 -f 0 -D 0 -R 1 -r 2 -d 2 -N 1000 -n 800 -w 1 -e 1 -I 1 -b /dev/fb0 -v /dev/video0

My screen rendered a broken image

How can i change wdr_mode ? Any helps ? Thanks.

XinnWang · August 18, 2021, 4:57am

@numbqq any helps or suggestions?

rahul_s · September 6, 2021, 12:19am

Were you able to solve this ?