Hot pixels (vertical line) to reduce in video capture

Lebeau

Hot pixels (vertical line) to reduce in video capture

« on: 03 / December / 2010, 19:36:19 »

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I already modified the "raw.c" file to remove this "hot pixelized" defective vertical lines when catching RAW and JPG.

Now, I would like to find what file I shall change to remove this line from video capture.

Thanks for CHDK ! I like, sorry, I love it.

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reyalp

13791

Re: Hot pixels (vertical line) to reduce in video capture

« Reply #1 on: 03 / December / 2010, 21:45:40 »

Maybe, maybe not. If you are reasonably proficient in reverse engineering, you may be able to figure it out. AFAIK, no one has modified the frames of in-camera video from CHDK yet.

First task is to find a buffer with the video before it is compressed, if such a thing is accessible to the ARM side of Digic.

If that is found, you may or may not be able to do the correction while keeping up with video frame rates.

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Lebeau

Re: Hot pixels (vertical line) to reduce in video capture

« Reply #2 on: 04 / December / 2010, 11:04:19 »

Thanks reyalp for your encouragements.

I tought you already found that place. In reengineering, younger, i was excellent but now ...

I will give a guess to look how to huffyuv the LCD content (480x360). I know where it is, it is used in Motion Detection ! It's not 640x480 but may be I would reach a faster pace than 30 fps ?!

But if I find the video processing path ...

P.S.: I never quit ...

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reyalp

13791

Re: Hot pixels (vertical line) to reduce in video capture

« Reply #3 on: 04 / December / 2010, 17:45:54 »

Quote from: Lebeau on 04 / December / 2010, 11:04:19

Thanks reyalp for your encouragements.

I tought you already found that place. In reengineering, younger, i was excellent but now ...

I will give a guess to look how to huffyuv the LCD content (480x360). I know where it is, it is used in Motion Detection ! It's not 640x480 but may be I would reach a faster pace than 30 fps ?!

But if I find the video processing path ...

P.S.: I never quit ...

You could record uncompressed live view, but 30fps might be difficult. Some information on live view layout http://chdk.setepontos.com/index.php?topic=5415.0

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Lebeau

Re: Hot pixels (vertical line) to reduce in video capture

« Reply #4 on: 11 / December / 2010, 10:47:57 »

I get a look to the suggested post and still asking a question.

What the difference between viewport and bitmap in, for exemple, "vid_get_viewport_fb" and "vid_get_bitmap_fb" ?

For video purpose, should viewport or bitmap get my attention? Or both?

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reyalp

13791

Re: Hot pixels (vertical line) to reduce in video capture

« Reply #5 on: 11 / December / 2010, 15:28:20 »

Quote from: Lebeau on 11 / December / 2010, 10:47:57

What the difference between viewport and bitmap in, for exemple, "vid_get_viewport_fb" and "vid_get_bitmap_fb" ?

For video purpose, should viewport or bitmap get my attention? Or both?

Viewport is the live view, in UYVYYY format. This shows the scene you see on the LCD.

Video recording may be available in another buffer somewhere before jpeg encoding, but this is unknown (to me at least)

bitmap is the UI overlay, which is 8 bit paletted, like original 256 color VGA.

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