MATLAB: How to control the thickness of the lines in IMCROP and IMFREEHAND in Image Processing Toolbox 6.0 (R2007b)

Image Processing Toolbox

I would like to control the thickness of the lines created when I use IMCROP and IMFREEHAND:

figure, imshow('pout.tif');
h = imfreehand(gca);

Best Answer

The ability to control the thickness of the lines in IMCROP and IMFREEHAND is not available in Image Processing Toolbox 6.0 (R2007b).

To work around this issue, perform the steps outlined below. Note that although effective in Image Processing Toolbox 6.0 (R2007b), these procedures are undocumented and are not expected to work in any other version of the Image Processing Toolbox.

To change the thickness of the line used by IMCROP:

1. Execute the commands

A = which('-all', 'wingedRect');
edit(A{:})

at the MATLAB command prompt. This will open a file called "wingedRect" in the MATLAB editor.

2. Go to line 61, which should read:

'LineWidth', 3*line_width, ...

and change it to instead read:

'LineWidth', 1*line_width, ...

3. Save the file by clicking on the "disk" icon in the MATLAB editor, and close the editor.

4. Use IMCROP as usual. The bounding box should now be 1 pixel thick.

To change the thickness of the line used by IMFREEHAND:

1. Execute the commands

A = which('-all', 'polygonSymbol');
edit(A{:})

at the MATLAB command prompt. This will open a file called "polygonSymbol" in the MATLAB editor.

2. Go to lines 35 AND 52, which should both read:

'LineWidth', 3*line_width, ...

and change them both to instead read:

'LineWidth', 1*line_width, ...

3. Save the file by clicking on the "disk" icon in the MATLAB editor, and close the editor.

4. Use IMFREEHAND as usual. The bounding curve should now be 1 pixel thick.

To change the thickness of the line used by IMFREEHAND in Image Processing Toolbox 6.3 (R2009a):

1. Execute the commands

A = which('-all', 'freehandsymbol');
edit(A{:})

at the MATLAB command prompt. This will open a file called "polygonSymbol" in the MATLAB editor.

2. Go to lines 42 AND 59, which should both read:

'LineWidth', 3*line_width, ...

and change them both to instead read:

'LineWidth', 1*line_width, ...

3. Save the file by clicking on the "disk" icon in the MATLAB editor, and close the editor.

4. Use IMFREEHAND as usual. The bounding curve should now be 1 pixel thick.

Related Solutions

MATLAB: How to control the thickness and line style of the bounding box in the IMPOLY function in Image Processing Toolbox 6.3 (R2009a)

The ability to control the thickness of the line in the polygon created with the IMPOLY function is not available in Image Processing Toolbox 6.3 (R2009a).

As a workaround, you can use the following undocumented steps to change the thickness of the polygon line. Note that although these steps should be effective for the Image Processing Toolbox 6.3 (R2009a), there is no guarantee that they will be effective in other versions of the Image Processing Toolbox. The suggested workaround also might cause unexpected behavior elsewhere in your code.

To change the thickness of the bounding box of the IMPOLY follow the steps outlined below:

1. Locate and open for editing polygonSymbol function by executing the following:

A=which('-all','polygonSymbol');
edit(A{:})

2. In definition of h_close_line_bottom in line 49, replace the following line :

'LineWidth', 3*line_width, ...

with

'LineWidth', 1*line_width, ...

3. In function makeBottomLine, in line 182, replace the following line:

'LineWidth', 3*line_width, ...

with

'LineWidth', 1*line_width, ...

4. Save the file by clicking on the "disk" icon in the MATLAB editor, and close the editor.

5. Use IMPOLY as usual. The bounding box should now be 1 pixel thick.

Another workaround is to get the handle to the IMPOLY object and then find the line objects. Once you have this you can change the line width using SET as shown below. To change other properties, replace the property name as appropriate. For example, to change the line style you can set the property 'linestyle' to the required value.

figure
imshow('gantrycrane.png');
h = impoly(gca, [188,30; 189,142; 93,141; 13,41; 14,29]);
%find line objects
lines = findall(h,'type','line');
set(lines,'linewidth','--')

MATLAB: Change the Line width in imfreehand

test = imfreehand('Closed',0);
pos = test.getPosition();
plot(pos(:,1),pos(:,2),'linewidth',5) ;

Best Answer

Related Solutions

MATLAB: How to control the thickness and line style of the bounding box in the IMPOLY function in Image Processing Toolbox 6.3 (R2009a)

MATLAB: Change the Line width in imfreehand

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