Demosaicing and bit dimensions

Started 8 months ago | Discussions thread
Roland Karlsson
Forum ProPosts: 20,473Gear list
Like?
Re: Demosaicing and bit dimensions
In reply to Mark Scott Abeln, 8 months ago

Mark Scott Abeln wrote:

OK, if we have a sensor that has, say, 16 megapixels, we expect that the final image produced also has 16 megapixels — one pixel per sensel, right?

While this seems common-sensical, are there practical mathematical reasons for a demosaicing algorithm to deliver another size, not mapping sensels to pixels 1:1? Not simply to resize, but because the it delivers superior results in one way or another?

I do believe the best you can do with a Bayer grid is to rotate it 45 degrees, and then use the green detectors as basis for the output. Then a 10 MP sensor becomes a 5 MP sensor, but a superior one. If you want to get as much as possible out of that rotated sensor, you might also make a 20 MP image.

Oops, Fuji already has done this! And they got heavily attacked when they tried the 20 MP trick. So, they were forced to output 10 MP from the 10 MP sensor, which, of course, is a very bad idea. So - they stopped making those sensors, as they were market wise impossible to sell.

 Roland Karlsson's gear list:Roland Karlsson's gear list
Canon PowerShot G10 Pentax K-5 Pentax smc DA 15mm F4 ED AL Limited Pentax smc FA 50mm F1.4 Pentax smc DA 21mm F3.2 AL Limited +6 more
Reply   Reply with quote   Complain
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark post MMy threads
Color scheme? Blue / Yellow