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hot pixel on Video, Powershot G12

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Offline biscottiz

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hot pixel on Video, Powershot G12
« on: 26 / November / 2019, 07:16:23 »
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Dear All,

I have a Canon powershot g12, when I record a video, there is a constant small red dot on the results.

I have googled about this problem and found out some canon cameras has a senor cleaning function which can solve this problem but the g12 doesn't have this function.  :-[

Is there a way to fix it with installing CDHK on my g12??

Thanks
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Offline reyalp

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Re: hot pixel on Video, Powershot G12
« Reply #1 on: 26 / November / 2019, 13:08:06 »
Quote from: biscottiz on 26 / November / 2019, 07:16:23

I have googled about this problem and found out some canon cameras has a senor cleaning function which can solve this problem but the g12 doesn't have this function.  :-[
Sensor cleaning normally refers to removing dust on the sensor. Hot pixels are defects in the sensor itself, which wouldn't be affected by cleaning.

Quote
Is there a way to fix it with installing CDHK on my g12??
No. Unfortunately, CHDK badpixel correction only works for stills, not video.

It's possible that Canon service could do something about it. The cameras have an internal badpixel list that we have not successfully reverse engineered.
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Offline c_joerg

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Re: hot pixel on Video, Powershot G12
« Reply #2 on: 27 / November / 2019, 02:05:58 »
Quote from: reyalp on 26 / November / 2019, 13:08:06
Sensor cleaning normally refers to removing dust on the sensor. Hot pixels are defects in the sensor itself, which wouldn't be affected by cleaning.
Canon DSLR and probably also the M's have a hidden mode for the removal of hot pixels.If you start the sensor cleaning manually with the lens removed, the hot pixels are also re-analyzed and deleted.
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Offline biscottiz

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Re: hot pixel on Video, Powershot G12
« Reply #3 on: 27 / November / 2019, 12:19:30 »
Quote from: reyalp on 26 / November / 2019, 13:08:06
Quote from: biscottiz on 26 / November / 2019, 07:16:23

I have googled about this problem and found out some canon cameras has a senor cleaning function which can solve this problem but the g12 doesn't have this function.  :-[
Sensor cleaning normally refers to removing dust on the sensor. Hot pixels are defects in the sensor itself, which wouldn't be affected by cleaning.

Quote
Is there a way to fix it with installing CDHK on my g12??
No. Unfortunately, CHDK badpixel correction only works for stills, not video.

It's possible that Canon service could do something about it. The cameras have an internal badpixel list that we have not successfully reverse engineered.

Thank you for your reply, as my camera is quite old, there is no warranty and bringing it to cannon i suspect they will charge a ridiculous amount to fix it that i would rather buy a new one...

but anyway, thanks for answering me and I will have some time to weep on this camera and move on with life.
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Offline reyalp

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Re: hot pixel on Video, Powershot G12
« Reply #4 on: 29 / November / 2019, 19:07:09 »
Quote from: c_joerg on 27 / November / 2019, 02:05:58
Canon DSLR and probably also the M's have a hidden mode for the removal of hot pixels.If you start the sensor cleaning manually with the lens removed, the hot pixels are also re-analyzed and deleted.
Thanks, I didn't know that. If the CHDK supported M's do in fact do this, it would be interesting to have before and after ROM dumps from a camera that had visible hot pixels.
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Offline c_joerg

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Re: hot pixel on Video, Powershot G12
« Reply #5 on: 01 / December / 2019, 03:39:36 »
Quote from: reyalp on 29 / November / 2019, 19:07:09
If the CHDK supported M's do in fact do this, it would be interesting to have before and after ROM dumps from a camera that had visible hot pixels.
If I get into the situation that my M3 has hot pixels, I would give it a try...
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M100 100a, M3 121a, G9x II (1.00c), 2*G1x (101a,100e), S110 (103a), SX50 (100c), SX230 (101a), S45,
Flickr https://www.flickr.com/photos/136329431@N06/albums
YouTube https://www.youtube.com/channel/UCrTH0tHy9OYTVDzWIvXEMlw/videos?shelf_id=0&view=0&sort=dd
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