GC2053 on reCamera 2002W: outdoor overexposure + purple tint indoors

[vikidev01]

Hi, I’m working with a Seeed reCamera 2002W. I replaced the original OV5647 sensor with a GC2053 (it works properly and fits the baseboard connector as recommended). I also changed the lens to match the FOV required by my project.
My main use case is outdoor daylight, but the image is currently heavily overexposed, and the auto-adjustment does not adapt well to lighting changes.
Additionally, during indoor testing (office ambient lighting), the image shows a consistent purple/magenta tint.
I suspect the color issue may be related to the presence/absence of an IR-cut filter.

Questions:

Is it possible to tune or limit auto exposure (AE) and/or gain for the GC2053 sensor on the reCamera 2002W?
Is there any recommended ISP tuning/configuration available for this sensor?
About the IR / IR-cut filter:
Is it required to avoid the purple tint?
Which model/brand do you recommend buying?
How should it be physically integrated into the lens/module setup (any guide/reference)?

I’m attaching images comparing outdoor (daylight) vs indoor (ambient light).

[Pillar1989]

@vikidev01 I'm very sorry for replying so late to your question—I just came back from a very long holiday

[Pillar1989]

@mingzhangqun He will help you solve the problem

[mingzhangqun]

Hi @vikidev01 ,
The reference docs:

• https://doc.sophgo.com/cvitek-develop-docs/master/docs_latest_release/CV180x_CV181x/en/01.software/ISP/ISP_Development_Reference/build/html/index.html
• https://doc.sophgo.com/cvitek-develop-docs/master/docs_latest_release/CV180x_CV181x/en/01.software/ISP/ISP_Tuning_Guide/build/html/index.html
• https://doc.sophgo.com/cvitek-develop-docs/master/docs_latest_release/CV180x_CV181x/en/01.software/ISP/PQ_Tools_User_Guide/build/html/index.html

How to run isp tunning tool on reCamera:

• Stop reCamera services:

/etc/init.d/S93sscma-supervisor stop
/etc/init.d/S91sscma-node stop

• Run on the Windows OS: CviPQtool_20250730.zip
• Run on reCamera: isp_tool_daemon.tar.gz

sensor_cfg.ini

;type = SOURCE_USER_FE 
dev_num = 1 
; section for sensor 
[sensor] 
; sensor name 
name = GCORE_GC2053_MIPI_2M_30FPS_10BIT
sns_i2c_addr = 63
bus_id = 2
mipi_dev = 0 
lane_id = 2, 0, 3, -1, -1 
pn_swap = 0, 0, 0, 0, 0 
mclk_en = 1 
mclk = 0

sudo rootfs_rw on
sudo mkdir /mnt/data
sudo cp sensor_cfg.ini /mnt/data
tar xvf isp_too_daemon.tar.gz
cd install 
sudo ./CviIspTool.sh 128M

[vikidev01]

Hello, thank you very much for your response and for the documentation.
I was able to complete the steps on the reCamera and I can now see the stream correctly, but I still need to configure the ISP parameters.

However, I have not been able to find the installer or the PQTools application to connect from Windows. I have reviewed the documentation and understand how to use it, but I could not find any download link or executable in the packages provided.

I also wanted to ask whether there is a Linux version available in addition to the Windows version, as I do not usually use Windows.

Could you please let me know where I can download PQTools or share the corresponding package?
Thank you very much.

[mingzhangqun]

Hi @vikidev01 ,
I'm sorry, but the compressed file was too large and the upload failed. I have updated the download link.
CviPQtool_20250730.zip

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[vikidev01]

Thanks a lot for the updated link and for sharing PQTools.

I was able to download it, connect successfully, and access the stream/configuration on the reCamera side, so that part is now working correctly.
At this point, my main difficulty is no longer the connection itself, but the ISP tuning process. The documentation is very complete, but also quite extensive, and I am still very new to ISP tuning, so it is difficult for me to identify which parameters I should actually adjust first among so many options.

So I wanted to ask:
Is there any simpler tutorial, quick-start guide, or example workflow specifically for beginners using PQTools with this sensor?
If not, could you at least recommend which parameters are the most important to tune first for my case?

So far I have tried exploring the available settings, but I have not achieved good results yet.
Any practical guidance on where to start would be very helpful.
Thank you again for your support.

[mingzhangqun]

@vikidev01 Hi, I don't have the same lens as you, so it's quite difficult to replicate your scenario.
These documents are quite suitable for beginners:

• https://doc.sophgo.com/cvitek-develop-docs/master/docs_latest_release/CV180x_CV181x/en/01.software/ISP/PQ_Tools_User_Guide/build/html/index.html
• https://doc.sophgo.com/cvitek-develop-docs/master/docs_latest_release/CV180x_CV181x/en/01.software/ISP/ISP_Tuning_Guide/build/html/index.html
• https://doc.sophgo.com/cvitek-develop-docs/master/docs_latest_release/CV180x_CV181x/en/01.software/ISP/ISP_Development_Reference/build/html/index.html

[github-actions]

This issue is stale because it has been open 14 days with no activity. Remove stale label or comment or this will be closed in 7 days.

[vikidev01]

Hello, thank you very much again for the documentation and support.

I would like to ask one additional question to better understand the available options.

Is ISP tuning with PQTools the only recommended way to adjust the image in this case?
Or is it also possible, from the C++ application side using OpenCV, to modify some parameters or apply additional image processing, for example to adjust contrast, brightness, or apply filters?

I understand that ISP tuning is probably the proper way to solve this at the source, but I would like to know whether there is also a practical alternative at the C++/OpenCV level, or whether that would not be recommended for this kind of issue.

Thank you again for your support.