Line Artifact - Anyone seen this in their DMK Images?

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edobosz
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Line Artifact - Anyone seen this in their DMK Images?

Post by edobosz »

Hi All

I have noticed in some of my recent shots a line artifact going horizontally across about the middle of the frame. Anyone else seen these or are they an artifact from processing or perhaps some interfence signal from somewhere?, but this effect seems too localised for that. Have attched a blowup of a pic taken this afternoon. Thanks.
Ted




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Re: Line Artifact - Anyone seen this in their DMK Images?

Post by Merlin66 »

Hmmm,
I see it - just below centre...
Can't say I've noticed anything similar with my DMK21 or DMK41....


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Re: Line Artifact - Anyone seen this in their DMK Images?

Post by Montana »

Yes I have it quite badly on mine (DMK41), however it is only very obvious on white light images. Thankfully mine are all at the top and extends down further to the right, as it is at the top it is usually in the area I just crop off, so I always lose the top portion of my images.

Alexandra


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Re: Line Artifact - Anyone seen this in their DMK Images?

Post by Merlin66 »

Alexandra,
Any ideas what may be causing it?
Read-out fault in the chip? Interference on the USB line???


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Re: Line Artifact - Anyone seen this in their DMK Images?

Post by MapleRidge »

Hi Ted...

Does that appear in every image, or intermittantly?

I have never seen anything like it in my DMK618 based camera, or any of the Lumenera cameras for that matter.

Hope you can get it sorted out.

Brian


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Re: Line Artifact - Anyone seen this in their DMK Images?

Post by Cschur »

Do your flats show it? if so, problem solved. Also, such artifacts in single frames usually dont show in the final stack because the images change when stacking on one solar feature. Show me your flat frame for this camera please.


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Re: Line Artifact - Anyone seen this in their DMK Images?

Post by swisswalter »

Hi Ted

sorry I can't make it out. Would you be kind enough to mark it for me :blush:


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Re: Line Artifact - Anyone seen this in their DMK Images?

Post by Montana »

Walter open the window and check out the middle!

Mine seems to be more and more prominent the brighter the amount of light comes through the camera (fastest shutter speed. This I corrected by adding a neutral density filter on the wedge but it is still there. It is also on my flat if I take it, I have one somewhere as I posted this a while back on CN but goodness, I have no idea where it is now. I think it is a flaw in the chip. Solargain's was so bad he sent it back and got another.

Alexandra


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Re: Line Artifact - Anyone seen this in their DMK Images?

Post by edobosz »

Hi Ted...

Does that appear in every image, or intermittantly?

I have never seen anything like it in my DMK618 based camera, or any of the Lumenera cameras for that matter.

Hope you can get it sorted out.

Brian

Thanks Brian, it seems to come and go, but seems to be on the increase. It is manangable but annoying.
Ted


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Re: Line Artifact - Anyone seen this in their DMK Images?

Post by edobosz »

Do your flats show it? if so, problem solved. Also, such artifacts in single frames usually dont show in the final stack because the images change when stacking on one solar feature. Show me your flat frame for this camera please.

Thanks Chris, I don't usually use flats but may have to stop being lazy. The problem appears to be intermittent and I am not sure I can see anything in the raw image. The image I posted was from autostakkert processing and I am going to redo image using avistack. I guess it is a process of elimination.
Ted


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Re: Line Artifact - Anyone seen this in their DMK Images?

Post by edobosz »

Hi Ted

sorry I can't make it out. Would you be kind enough to mark it for me :blush:

Hi Walter thanks.
AI'm at work right now and can't mark up. Look at the midpoint between the two sunspots and then move to the two brightest flare spots below that midpoint and you'll see it run past very near to the brightest flaring.

Ted


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Re: Line Artifact - Anyone seen this in their DMK Images?

Post by JimLafferty »

I see it occasionally in my prom and white light images with my dmk41. If it appears I go back into avistack 2.0 and look at each of the final frames that will be stacked and exclude that one bad frame. I have yet to find it on more than a single frame in any one avi and once it is excluded all evidence of it is gone from the final stacked image. I suspect it's an artifact of some "blip" in the USB data transfer. I don't think its a bad row of pixels as it never appears on more than any one frame in any one avi. one of the reasons I like avistack---easy to have it select the best quality frames and then I can manually review each one for issues like this should they occur. I'd say I might see the artifact on 1 out of 10 Avi's and then only on a single frame.
Jim


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Re: Line Artifact - Anyone seen this in their DMK Images?

Post by marktownley »

I must be lucky, but not come across it before with my images...


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Re: Line Artifact - Anyone seen this in their DMK Images?

Post by Braditude »

I see nothing but a beautiful image. :bow:


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Re: Line Artifact - Anyone seen this in their DMK Images?

Post by swisswalter »

Hi Alexandra, Hi Ted

thank you for the help, I can see it now too. Maybe it has something to do with the power supply. I have not yet seen these artifacts on my basler camsand earlier as I used the DMK's I have never noted it


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