MATLAB: How to draw a polygon starting with R2018b

axdragdrawdrawpolygonfiguregcaguiimageImage Processing Toolboximdrawimpolymousepolygonvertex

How to draw a polygon starting with R2018b?

Before one often used the function 'impoly' for that.

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Introduced in R2018b there is the new function called 'drawpolygon' which can create a customizable polygonal ROI.

Please use this one instead of 'impoly'.

You can find more information in the documentation below:

https://www.mathworks.com/help/images/ref/drawpolygon.html

Related Solutions

MATLAB: How to trace the outline of an image with the mouse and return the coordiantes of the resulting shape

There is no single built in MATLAB function that will track the movement of the mouse on an open figure, draw the resulting curve and return its X Y coordinates. There are user submitted functions that will do this in MATLAB Central such as the MOUSETRACK function in the link below:

https://www.mathworks.com/matlabcentral/fileexchange/8262-freehand-contour-drawing

Note that MathWorks does not guarantee or warrant the use or content of these submissions. Any questions, issues, or complaints should be directed to the contributing author.

MATLAB: How to generate a binary mask for a patch object super imposed on a surface in MATLAB 7.4 (R2007a)

The ROIPOLY function in the Image Processing Toolbox is capable of providing the functionality required. This function may be used with the following syntax:

I = imread('<filename>');
mask = roipoly(I); %Generates a mask the same size as the image file with 1's in the area of interest

where filename is the name of your image file.

This displays the image 'I' on the screen and lets you specify the polygon using the mouse. Use left button clicks on the mouse to add vertices to the polygon.

Note that pressing the Backspace or Delete keys removes the previously selected vertex. A double-click adds a final vertex to the selection and then starts the fill; pressing Return finishes the selection without adding a vertex.

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Related Solutions

MATLAB: How to trace the outline of an image with the mouse and return the coordiantes of the resulting shape

MATLAB: How to generate a binary mask for a patch object super imposed on a surface in MATLAB 7.4 (R2007a)

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