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#1 2018-05-04 09:57:14

Kai
Member
Registered: 2018-05-04
Posts: 2

Stuck pixels on WithRobot oCam 1CGN-U Color Global Shutter Camera

Hello,

We have bought several WithRobot oCam 1CGN-U Color Global Shutter Cameras and it seems all of them have stuck pixels.
They are either red, green or blue, but I haven't seen any white stuck pixels.
There are tens of stuck pixels in each camera.

We also have one WithRobot oCam 1MGN-U Mono Global Shutter Camera, which is mono color camera.
It also has stuck pixels.

We have noticed the stuck pixels by taking pictures with the lens cap on. Then we have other pictures at
normal lighting conditions aiming at a grey carpet.

We have used few different exposure settings in our tests with auto exposure and manual exposure.

So far we haven't seen any dead pixels in these cameras.

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#2 2018-05-07 11:42:26

Diigiit Sales
Member
Registered: 2014-05-26
Posts: 99

Re: Stuck pixels on WithRobot oCam 1CGN-U Color Global Shutter Camera

We have sent your question to WithRobot supplier.

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#3 2018-05-08 11:44:36

WITHROBOT
Member
Registered: 2018-05-08
Posts: 1

Re: Stuck pixels on WithRobot oCam 1CGN-U Color Global Shutter Camera

The oCam-1MGN-U and the oCam-1CGN-U cameras do not include onboard ISP.
So, you would get the raw image data with defective pixels data if there are.

For AR0134 CMOS image sensor, which is used in those cameras, we can't provide the details of the outgoing defect specifications of the sensor manufacturer as they are confidential and proprietary information of the company.
However, the following information can be given as a reference.

There are 7 types of defects defined and only the names, illumination conditions and the allowable maximum number of defects can be given as follows:
    Very Hot: 160 under dark illumination
    Hot: 350 under dark illumination
    Very Bright: 50 under midlevel illumination
    Bright: 110 under midlevel illumination
    Dark: 50 under midlevel illumination
    Very Dark: 40 under midlevel illumination
    Clusters (consecutive defective pixels): 0 under dark and midlevel illumination

We receive the sensors which are within the limits specified above from the sensor manufacturer and provide them to our customers in turn as manufactured as cameras.

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#4 2018-05-08 15:16:09

Diigiit Sales
Member
Registered: 2014-05-26
Posts: 99

Re: Stuck pixels on WithRobot oCam 1CGN-U Color Global Shutter Camera

So as I understand it, providing a camera with highest hardware specs would result in a far more expensive product.

Since clusters (consecutive defective pixels) rate is 0, some kind of software image processing can be done to skip a pixel or give it a value similar to the previous pixel. So you have the control on what you can do with those pixels as compared to other camera that are going to do the job for (but with no control on it). So this camera give you more control on your image and the algorithm used to process it.

Last edited by Diigiit Sales (2018-05-08 15:17:15)

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#5 2018-05-21 13:45:51

Kai
Member
Registered: 2018-05-04
Posts: 2

Re: Stuck pixels on WithRobot oCam 1CGN-U Color Global Shutter Camera

Thanks for the answer.

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