oCam 1CGN-U Color Aliasing

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oCam 1CGN-U Color Aliasing

Unread postby muhammadsyahyas » Fri Jan 19, 2018 4:56 pm

Hello! I tested my recently received order of oCam 1CGN-U with oCam-viewer on Ubuntu. When I tried to see the detail, I noticed that there was some color aliasing. I can't take picture with oCam-viewer, so I tried with opencv-basic_1CGN. As you can see on images below, the color aliasing really noticeable at ventilated white wall on the building at background, at white car edges, at man playing laptop edges, and at black car behind him.
oCam-1CGN-U SN_29B4E029_screenshot_19.01.2018_2.png
oCam 1CGN-U 1280x720
oCam-1CGN-U SN_29B4E029_screenshot_19.01.2018_2.png (1.6 MiB) Viewed 528 times

I tried with other resolution (i.e. 640x480), it getting worse.
oCam-1CGN-U SN_29B4E029_screenshot_19.01.2018.png
oCam 1CGN-U 640x480
oCam-1CGN-U SN_29B4E029_screenshot_19.01.2018.png (400.33 KiB) Viewed 528 times

I'm using same camera on topic viewtopic.php?f=119&t=29588, but I posted this on new topic because I think the topic is different. No difference connecting it on USB 2.0 or USB 3.0; still there was color aliasing. Is it normal? Or is there any explanation / solution? Thanks.

Ps.: Here image taken with my Asus Zenfone 5 with 8MP camera, image taken on 2MP resolution (lowest resolution available); just for reference.
P_20180119_135139(1).jpg
Asus Zenfone 5
P_20180119_135139(1).jpg (1.15 MiB) Viewed 524 times
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Re: oCam 1CGN-U Color Aliasing

Unread postby WITHROBOT » Mon Jan 22, 2018 11:09 am

For oCam-1CGN-U, you may want to try the auto color correction.

While the camera is connected,
"Play" => (The image is being displayed) => "Cam Ctrl" => (CamCtrl window will pop-up) => "Reset" under "Color correction" => "Color correction".
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Re: oCam 1CGN-U Color Aliasing

Unread postby muhammadsyahyas » Tue Jan 23, 2018 7:28 am

No, it's not about color correction. The color seems ok, as we can see fill color of the leaves are normal (in Zenfone 5 picture it's post-processed by camera app). I think it's normal that it has color aliasing, since the sensor neither the lens doesn't have antialiasing filter (?). Maybe someone would invent some source code to eliminate this kind of artifact by post-processing. Here a good reference that explains about color aliasing : https://van.physics.illinois.edu/qa/listing.php?id=1868
Thanks.
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Re: oCam 1CGN-U Color Aliasing

Unread postby WITHROBOT » Tue Jan 23, 2018 1:48 pm

Thank you for your comments and contribution.
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