bugGNU Octave - Bugs: bug #43218, [octave forge] (image) imshear...

 
 

bug #43218: [octave forge] (image) imshear causes more signal spread than expected and inconsistent vertical offset

Submitted by:  None
Submitted on:  Sat 13 Sep 2014 04:34:01 PM UTC  
 
Category: Octave Forge PackageSeverity: 3 - Normal
Priority: 5 - NormalItem Group: Inaccurate Result
Status: NoneAssigned to: None
Originator Name: sepesiOriginator Email: -unavailable-
Open/Closed: OpenRelease: other
Operating System: Any

Add a New Comment(Rich Markup)
   

You are not logged in

Please log in, so followups can be emailed to you.

 

Fri 16 Dec 2016 07:31:17 PM UTC, comment #4:

This issue is still present in Octave 4.2.0 with image-2.6.1.

There is a suggestion of new code in comment #1, but no changeset yet.

Hartmut <hardy>
Mon 15 Sep 2014 07:57:49 PM UTC, comment #3:

No need for attribution on the imshear suggested fix. If I eventually have significant changes to Octave (I am curious about making Octave more competitive with MatLab in terms of execution speed), I'll get familiar with Octave's code submission process.

- sepesi

Anonymous
Mon 15 Sep 2014 11:09:45 AM UTC, comment #2:

Thank you for the bug report and patch. Would you be able to submit an hg changeset with your changes? This would make it easier to review and accept the changes while keeping the whole attribution to you.

Carnë Draug <carandraug>
Project Member
Sun 14 Sep 2014 07:02:11 PM UTC, comment #1:

To improve the accuracy of shearing, I wrote the following imshear variant. It currently is limited to the crop option (i.e., BBOX = 'crop' in imshear).

Anonymous
Sat 13 Sep 2014 04:34:01 PM UTC, original submission:

When the argument ALPHA is less than one, I believe the signal spread should be limited to just one neighboring element. There
also is an unexpected one pixel variance in the sheared image's vertical offset depending on the image height. Both unexpected results are created on my system with the following code:

Anonymous

 

(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

Attach File(s):
   
   
Comment:
   

Attached Files
file #32086:  bug_imshear1.png added by None (52KiB - image/png)
file #32087:  bug_imshear2.png added by None (47KiB - image/png)

 

Depends on the following items: None found

Items that depend on this one: None found

 

Carbon-Copy List
  • -unavailable- added by jwe (Updated the item)
  • -unavailable- added by hardy (Posted a comment)
  • -unavailable- added by mtmiller (Updated the item)
  • -unavailable- added by None (Submitted the item)
  •  

    Do you think this task is very important?
    If so, you can click here to add your encouragement to it.
    This task has 0 encouragements so far.

    Only project members can vote.

     

    Please enter the title of George Orwell's famous dystopian book (it's a date):

     

     

    Follow 7 latest changes.

    Date Changed By Updated Field Previous Value => Replaced By
    Sun 13 Aug 2017 01:32:44 PM UTCjweSummaryimage package: imshear causes more signal spread than expected and inconsistent vertical offset=>[octave forge] (image) imshear causes more signal spread than expected and inconsistent vertical offset
    Wed 16 Nov 2016 11:37:35 PM UTCmtmillerRelease3.6.4=>other
      Operating SystemMicrosoft Windows=>Any
      Summaryimage: imshear causes more signal spread than expected and inconsistent vertical offset=>image package: imshear causes more signal spread than expected and inconsistent vertical offset
    Mon 15 Sep 2014 11:09:45 AM UTCcarandraugSummaryimshear causes more signal spread than expected and inconsistent vertical offset=>image: imshear causes more signal spread than expected and inconsistent vertical offset
    Sat 13 Sep 2014 04:34:01 PM UTCNoneAttached File-=>Added bug_imshear1.png, #32086
      Attached File-=>Added bug_imshear2.png, #32087

    Back to the top


    Powered by Savane 3.1-cleanup1