PMView.com

Welcome Guest ( Log In | Register )

 
Reply to this topicStart new topic
> Resizing/resampling, info please!
Guest_Andrew K_*
post Jul 28 2005, 12:32 PM
Post #1





Guests






Hello,

Can anyone tell me the algorithm pmview uses when resizing with the resampling option? Best of all would be if someone who knows could describe the entire algorithm and/or send me some code, but it would be extremely useful to know whether it's a simple bilinear resampling scheme, or bicubic, or sinc, or put through a low-pass filter and then something else.

Any info greatfully received -- I'm using pmview in a research project and I ought to include this information in my paper.

Thanks,

Andrew
Go to the top of the page
 
+Quote Post
Peter
post Jul 31 2005, 11:55 AM
Post #2


Forum Member


Group: Admin
Posts: 662
Joined: 14-March 00
From: Wilmington, North Carolina
Member No.: 3



Hello,

The "Standard" resampling uses a Triangle filter (Bartlett window, 2nd order b-spline)

The "High Quality" resampling uses Mitchell & Netravali's two-param cubic filter (See Mitchell&Netravali, "Reconstruction Filters in Computer Graphics", SIGGRAPH 88).

Thanks,
Peter


--------------------
Peter Nielsen (peter@pmview.com) "If you can dream it, you can do it" JFK.
Go to the top of the page
 
+Quote Post
Guest_Andrew K_*
post Aug 1 2005, 09:08 AM
Post #3





Guests






QUOTE (Peter @ Jul 31 2005, 12:55 PM)
The "Standard" resampling uses a Triangle filter (Bartlett window, 2nd order b-spline)                                                 
                                                                                       
The "High Quality" resampling uses Mitchell & Netravali's two-param cubic filter (See Mitchell&Netravali, "Reconstruction Filters in Computer Graphics", SIGGRAPH 88).
*



Fantastic, thanks very much. I'm a bit confused about "standard" and "high quality" though -- I thought those options only applied to rescaling when displaying the picture, not resizing the image through the transform menu. Do they also affect the result of the transform/size procedure?

Andrew
Go to the top of the page
 
+Quote Post
Peter
post Aug 3 2005, 12:34 PM
Post #4


Forum Member


Group: Admin
Posts: 662
Joined: 14-March 00
From: Wilmington, North Carolina
Member No.: 3



The Transform menu always uses the "High Quality" filter, i.e. Mitchell.


--------------------
Peter Nielsen (peter@pmview.com) "If you can dream it, you can do it" JFK.
Go to the top of the page
 
+Quote Post
Guest_Andrew K_*
post Aug 6 2005, 04:01 AM
Post #5





Guests






QUOTE (Peter @ Aug 3 2005, 01:34 PM)
The Transform menu always uses the "High Quality" filter, i.e. Mitchell.
*


Thanks for your time in answering my questions. Your software is super!

Andrew
Go to the top of the page
 
+Quote Post

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



Lo-Fi Version Time is now: 15th August 2018 - 07:24 PM