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Faking and expensive tilt-shift lens



 
 
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  #41  
Old February 10th 09, 08:57 PM posted to aus.photo,rec.photo.digital,rec.photo.digital.slr-systems
Wolfgang Weisselberg
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Posts: 5,285
Default |AX| Faking and expensive tilt-shift lens

["Followup-To:" header set to rec.photo.digital.slr-systems.]
Paul Furman wrote:

I'm not sure how a half pixel shift would work for increasing
resolution... perhaps you'd need to go 1-1/2 or 2-1/2 pixels.


You may be interested in
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http://www.wisdom.weizmann.ac.il/~ir...SR_CVGIP91.pdf


-Wolfgang
  #42  
Old February 10th 09, 10:31 PM posted to rec.photo.digital
John A.[_2_]
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Posts: 1,551
Default Faking and expensive tilt-shift lens

On Tue, 10 Feb 2009 21:49:15 +0100, Wolfgang Weisselberg
wrote:

John A wrote:

G R
B G


Together, those four photosensors make up one pixel.


Sorry, your claim is as invalid as your email address.


Yeah, I figured that out. :P Read on.
  #43  
Old February 19th 09, 12:27 AM posted to aus.photo,rec.photo.digital,rec.photo.digital.slr-systems
k
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Posts: 69
Default |AX| Faking and expensive tilt-shift lens


"mcdonaldREMOVE TO ACTUALLY REACH wrote in message
...
| Paul Furman wrote:
|
| Dissolving the filter doesn't change the circuitry and firmware. The
| camera still interprets the 2x2 sensor array as one pixel.
|
| That's incorrect. The algorithms used to determine pixel values
| actually look at MORE than a 2x2 array! They try to determine, for
example,
| if an edge runs through a pixel. If it does, they use other
| parts of the two sides ... outside a 2x2 array ... to try to determine
| all three RGB values of the pixel. The algortithms are nonlinear ..
| they do not merely interpolate. They actually GUESS.
|
|
| The raw file has the separate bayer parts unmerged.
|
| I'm not sure how a half pixel shift would work for increasing
| resolution... perhaps you'd need to go 1-1/2 or 2-1/2 pixels.
|
|
| 1/2 pixel increments would work.
|
| Doug McDonald

and the nyquist limit?


  #44  
Old February 19th 09, 01:38 AM posted to aus.photo,rec.photo.digital,rec.photo.digital.slr-systems
Mr.T
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Posts: 889
Default |AX| Faking and expensive tilt-shift lens


"k" wrote in message
...
and the nyquist limit?


Increases directly with increased bandwidth.

MrT.


  #45  
Old February 20th 09, 03:13 AM posted to aus.photo,rec.photo.digital,rec.photo.digital.slr-systems
k
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Posts: 69
Default |AX| Faking and expensive tilt-shift lens


"Mr.T" [email protected] wrote in message
u...
|
| "k" wrote in message
| ...


again

1/2 pixel increments would work.



| and the nyquist limit?
|
| Increases directly with increased bandwidth.
|
| MrT.
|
|

 




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