Does Sony's "clear zoom" work with non-Sony lenses? Or with the LA-EA2 + A-mount?

Started Mar 29, 2014 | Questions thread
Digital Nigel Veteran Member • Posts: 7,308
Re: Does Sony's "clear zoom" work with non-Sony lenses? Or with the LA-EA2 + A-mount?

GaryW wrote:

Digital Nigel wrote:

captura wrote:

Because they're no the same thing.
I refer you to this brief explanation from Sony:

"Below are the definitions of optical zoom, clear image digital zoom and Precision Digital zoom. In short for the best image quality Clear Image digital zoom has a database of patterns it can refer back to and create new pixels for a better quality image than Precision Digital zoom which is basically just crops in.

Optical zoom: true zoom, by using optical zoom quality remains the same and the full resolution of the camera can be used on the zoomed image.

Clear Image Digital Zoom: the processor compares patterns found in adjacent pixels and creates new pixels to match selected patterns, resulting in more realistic, higher quality images

And how, exactly is that different to bicubic resampling ("With bicubic resampling, first the coordinate of each pixel in the output map is determined; then the values of 16 surrounding pixels of the input map are used to calculate an interpolated value for each pixel in the output map”)?

Bicubic applies a formula, while CIZ pattern matches. You can read the difference in the blurbs above. We aren't going to find out details as it's proprietary. Perhaps it uses even more pixels to establish a pattern. Who knows?

OK, I did another test, this time using remote controls as some people seem to think that's a better test of an extended zoom than shooting distant buildings. Again, both shots were on a tripod, OSS turned off, properly focused, same camera settings, low ISO, and these are 100% centre crops. The RAW has again been upsampled, using bicubic sharper in DxO:

100% centre crop, but based on which method?

100% centre crop, but based on which method?

So, I have two questions:

  1. Do you see any significant differences between these images that suggests that CIZ has a secret, superior, pattern-based algorithm compared to boring old bicubic, that allows it to extract extra details or show smoother images?
  2. And if you do, which do you prefer?
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