Cat Detector Mk IV #2 : Now With Video (Mostly)

11 Jun 2021

The AV to HDMI convertor has arrived and I have connected it up to the Serial JPEG camera and a HDMI display. The HDMI display is from a previous Element14 Project (HoloPiBot #10 : It Actually Works - It Really D... | element14 | Programmable Logic) and is the only HDMI display I think I have, although I could use the laptop or TV if I want a bigger picture. Below is an example of everything rather haphazardly plugged together.

This is all working, which is good, but unfortunately there seems to be some sort of shadow image that is always present. It does look as if the camera might have some previous image 'burned' into it (I didn't know this was possible). I have checked the previous image I have (in Cat Detector Mk IV #1 : Testing the Serial TTL ... | element14 | Photography) and I could not see any evidence of this shadow image so it looks as if somehow I have done it - although I have no idea how.

Does anyone have any ideas how to get rid of this shadow image?

Dubbie

PS Not all my videos are faultless and professional. Sometimes I cannot even remember what I am doing!

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beacon_dave over 4 years ago

"...It does look as if the camera might have some previous image 'burned' into it..."
Could it be that you have saved a previous video frame as some sort of logo/privacy/OSD type overlay ?
Some security cameras have those sort of features built-in.
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beacon_dave over 4 years ago

"...It does look as if the camera might have some previous image 'burned' into it..."
Could it be that you have saved a previous video frame as some sort of logo/privacy/OSD type overlay ?
Some security cameras have those sort of features built-in.
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dubbie over 4 years ago in reply to beacon_dave

Dave,

Thanks for this idea. I had not thought of this concept before, but it had also occurred to be in the night that it might be some sort of option for combining two images, maybe a negative and the original to more easily see the changes - indicating motion. All I have to do now is work out what I did and undo it.

Dubbie
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beacon_dave over 4 years ago in reply to dubbie

Not sure if it helps fix the problem, but looks like the feature is available in the video DSP.
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dubbie over 4 years ago in reply to beacon_dave

Dave,

Thanks for this. I do remember something being mentioned in the user manual about the OSD function but I recollect (possibly wrongly) that it didn't work properly. Anyway, I am hopeful that I might be able to get rid of the second image - somehow. It's raining today so no more path laying, maybe I'll have another look. Or a cup of tea. A cup of tea I think.

Dubbie
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