Thread: Aliasing

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    #91
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    Quote Originally Posted by paulcurtis View Post
    Just to add my euro cents

    I think the aliasing issue is more to do with the line skipping the canons use rather than OLPF. Whilst the OLPF does have an effect it's nowhere near as aggressive as the skipping. Line skipping is like looking through venetian blinds, giant horizontal chunks of the image simply isn't being recorded.

    I have an LX3 next to me, 720p and i don't have anywhere near like the artefacts as the canons. Yes, i can see moireing in places if i look for it, and that *is* down to the OLPF but if the canons performed like the LX3 in this regard i think most people would find them much more acceptable.

    I'm looking forward to the new sony alphas and see what they do in that regard.

    cheers
    paul
    The Canons do not line skip. They use pixel binning. Every pixel is is used.


     

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    #92
    Senior Member strangways's Avatar
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    The Canon DSLRs bin horizontally and line-skip vertically. It's not FUD or suspicion, it's an easy fact to prove with a resolution chart.
    http://www.dvxuser.com/V6/showpost.p...3&postcount=10


     

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    #93
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    ^ as above - this is why the GH1 looks a little better in the res charts. Some more blarb to back this up from the EOSHD wiki:

    For video, the 7D sensor has a further curtailing of advantage, because despite being larger the resolution of the sensor is 18MP compared to 12MP on the GH1's, so pixel pitch is actually similar. Furthermore, whilst the GH1 uses pixel binning to downscale the image, the 5D Mark II and 7D line-skip over the sensor to produce an image containing more aliasing and moire than if a pixel binning method was used. The ideal method would be similar to that used in Photoshop, whereby bicubic algorithms are used and pixel binning occurs in a less crude way. But current generations of image processing chips in portable electronic devices are not yet high-performance / power-economical enough at once, to handle such intensive work at over 24fps.
    (Source: EOSHD.com)
    From the DXOMark article, GH1 versus 7D:


    The gh2's "teleconverter" mode sounds very interesting and could potentially end these aliasing/moire nasties, here

    Sorry to sound like a panasonic fan-boy, just stuff i found doing my research!


     

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    Excellent piece on Aliasing... made sense even to me. :)
    #94
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    Well written piece.

    Made sense even to me.

    Will scan the thread in search of some solutions or compromises in the form of filters or throwing the frame a little out of focus.

    Thank you.


     

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    #95
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    Can someone explain me how it is possible that the DSLR's image has a lot of detail and is sharp, but that it is actually rendered wrong? In most shots you dont see aliasing but according to this article it is still there cause it's responsible for a lot of the detail... How it does that?
    And is it really so bad if you avoid certain situations?


     

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    #96
    Junior Member kulitam's Avatar
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    I'd like to ask about getting rid of moire. One of suggestions in the article claims that unfocusing area with this effect could be helpful. I'm wondering how effective this solution could be (Have anyone seen some tests somewhere on the internet, or have anyone personal experience with solving these problem?).
    Or are there any other "methods" (which aren't included in the article) which can lead to clear image without distracting artifacts? (and eventually how effective/expensive they are).


     

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    #97
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    Great article, may actually be of some use.


     

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