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 Package Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Inaccurate Result
Status:  None Assigned to:  None
Originator Name:  sepesi Originator Email:  -email is unavailable-
Open/Closed:  Open Release:  other
Operating System:  Any

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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

 

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Attach Files:
   
   
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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
  • -email is unavailable- added by jwe (Updated the item)
  • -email is unavailable- added by hardy (Posted a comment)
  • -email is unavailable- added by mtmiller (Updated the item)
  • -email is unavailable- added by None (Submitted the item)
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    Follow 7 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2017-08-13 jwe Summaryimage 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
    2016-11-16 mtmiller Release3.6.4 => 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
    2014-09-15 carandraug Summaryimshear causes more signal spread than expected and inconsistent vertical offset => image: imshear causes more signal spread than expected and inconsistent vertical offset
    2014-09-13 None Attached File- => Added bug_imshear1.png, #32086
        Attached File- => Added bug_imshear2.png, #32087

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