"Invalid graphics handle" error when using imrect() or imellipse()

Question

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I'm trying to apply a mask onto an image for processing, but the call:

h = imrect(output,[2 3 4 5]); %xmin ymin width height

aways gives me the errors:

Error using roiParseInputs (line 75) HPARENT must be a valid graphics handle.

Error in imrect>imrectAPI (line 182) [commonArgs,specificArgs] = roiParseInputs(0,2,varargin,mfilename,{'DrawAPI'});

Error in imrect (line 82) [h_group,draw_api] = imrectAPI(varargin{:});

I have no clue how to resolve this error.

\removed code\

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Answer 1

Adam Danz il 30 Lug 2018

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The first step is always to check your inputs.

help imrect

You'll see that the first input to this function is an axis handle. Try this (or better yet, the actual handle to your axes).

h = imrect(gca, output,[2 3 4 5]);

Bissem Gill il 30 Lug 2018

Modificato: Bissem Gill il 30 Lug 2018

Edit: Nevermind, I just needed to include 'figure;' before my function. Thanks Adam!

Thanks Adam. For some reason, when I modify my imrect() to be exactly what you've typed here, I end up getting:

Error using roiParseInputs>checkPreParamNargin (line 153) Too many input arguments.

I'm a little confused, because I think I'm following the inputs correctly as per the documentation.