Re: Νέα Sony RX-10 1'' sensor 24-200 f2.8
στο βιντεο ειδικα , ειναι η πρωτη μηχανη που "διαβαζει" ολο τον αισθητηρα σε 60p και μετα κανει resize σε 1080!
Αυτο σημαινει οχι πια moire kai aliasing, και πολυ πιο sharp εικονα...
http://www.imaging-resource.com/camera-reviews/sony/rx10/
Where the Sony RX10 really breaks new ground for video, though, is that it's the first camera we're aware of that reads out the entire sensor pixel array for every frame, performing sub-sampling/video anti-aliasing in the processor. This potentially addresses the huge bugaboo of still-camera video recording, namely the tendency towards moiré and false-color artifacts, thanks to the mismatch between still-image and video resolution.
Pretty much every digital still camera we've tested produces very noticeable moiré patterns and color artifacts in its video. (The Canon 5D Mark III deserves note as doing better than most, but even it still shows some level of video artifacts.)
The issue is that a still camera has to get rid of a lot of its image data in order to output a 1,920 x 1,080 video image. They usually don't have enough processor horsepower to do a proper job of sub-sampling the image in the vertical direction (across scan lines), so resort to simply skipping rows of pixels, jumping 2, 3, or 4 rows for each one actually output. The problem with this is that the image data is way undersampled from an image-processing standpoint, so moiré and artifacts are pretty much guaranteed. It's not that the industry doesn't know what to do to prevent the problem, it's just that there isn't enough processing horsepower available to do what the job requires. Until now.
Besides its advantages for still image processing, the new BIONZ X processor in the Sony RX10 has a special LSI front-end processing section ideally suited to processing huge amounts of video data on the fly. For the first time (that we're aware of), the RX10's processor clocks the entire 20-megapixel image off the array up to 60 times/second, and then sub-samples (think of it as a special class of signal averaging) the raw image data digitally, to produce the final 1,920 x 1,080 video image. Doing so effectively performs a low-pass filtering operation on the video data, thus greatly reducing the propensity for moiré and false color artifacts.
