bugGNU Octave - Bugs: bug #56451, [octave forge] (image) imsmooth,...


bug #56451: [octave forge] (image) imsmooth, Gaussian third parameter

Submitted by:  PIERRE LABRECHE <pierre5018>
Submitted on:  Thu 06 Jun 2019 04:56:53 PM UTC  
Category:  Octave Forge Package Severity:  2 - Minor
Priority:  3 - Low Item Group:  Documentation
Status:  Need Info Assigned to:  None
Originator Name:  pierre5018 Open/Closed:  Open
Release:  dev Operating System:  Any

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Thu 06 Jun 2019 08:39:09 PM UTC, comment #5:

Thanks. It looks to me like you're suggesting that the headings for the full documentation sections should use the same names as the option strings. If you would like to help the image package maintainers, the best way forward would be to provide a patch that makes the changes that you think would help.

Mike Miller <mtmiller>
Project Administrator
Thu 06 Jun 2019 07:53:35 PM UTC, comment #4:

Yes it clarifies.  I was confused by the double nomenclature "Gaussian" and "Isotropic Gaussian smoothing " ; at first sight, they appeared like different things.

I suggest the documentation keeps the same nomenclature as the option.

PIERRE LABRECHE <pierre5018>
Thu 06 Jun 2019 07:39:57 PM UTC, comment #3:

Further down in the documentation is the following

Isotropic Gaussian smoothing

>  The image is convolved with a Gaussian filter with spread sigma. By default sigma is 0.5, but this can be changed. If the third input argument is a scalar it is used as the filter spread.

>  The image is extrapolated symmetrically before the convolution operation.

Does that description take care of this? Can you suggest further improvements to the function doc string?

Mike Miller <mtmiller>
Project Administrator
Thu 06 Jun 2019 07:24:41 PM UTC, comment #2:

There is no description of the third parameter in the documentation.


Function File: J = imsmooth(I, name, options)
Smooth the given image using several different algorithms.

The first input argument I is the image to be smoothed. If it is an RGB image, each color plane is treated separately. The variable name must be a string that determines which algorithm will be used in the smoothing. It can be any of the following strings

Isotropic Gaussian smoothing. This is the default.

PIERRE LABRECHE <pierre5018>
Thu 06 Jun 2019 06:40:42 PM UTC, comment #1:

Thank you for your bug report. Can you describe more clearly what the bug is that you are describing? Is it that the documentation is not clear enough? Is there a specific example you can give that does not work?

Mike Miller <mtmiller>
Project Administrator
Thu 06 Jun 2019 04:56:53 PM UTC, original submission:

missing function for third parameter
"third input argument must be a positive scalar when performing Gaussian smoothing"
what is the purpose of the third parameter ?

PIERRE LABRECHE <pierre5018>


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    Follow 7 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2019-06-06 mtmiller Severity3 - Normal => 2 - Minor
        Priority5 - Normal => 3 - Low
        Release4.4.1 => dev
        Operating SystemMicrosoft Windows => Any
    2019-06-06 mtmiller CategoryOctave Function => Octave Forge Package
        StatusNone => Need Info
        Summaryimsmooth, Gaussian third parameter => [octave forge] (image) imsmooth, Gaussian third parameter

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