MATLAB: How to convert Matlab scatterplot axis to display pixels

axisaxis conversionaxis unitsscatterplot

I am drawing a circle via scatterplot and it plots it in the form of arbitrary units. I want those units to be in pixels so I can run some further algos on them. Imdistline doesn't do much as it only displays the distance in terms of the arbitrary units.

Best Answer

Set the XLim and YLim properties of your axes to match the 'Position' property of your axes (doing the obvious maths to go from the start, size represented by position to the start, end needed by xlim and ylim), either relative to the figure (i.e. taken directly from 'Position' with the origin the same) or relative to the axes start (i.e. origin at 0 and x and y lim just set to the size of the axes).

Then draw your circle and it will be in pixel space.

Related Solutions

MATLAB: How to plot points in pixel coordinates

Hi,

You get different size of printed image possibly because the axes are printed as well. In your code you are setting the position of the figure and axes handles such that they are hidden from user view but they do exist.

A better snippet of code that achieves what you are trying to accomplish is this:

Img = zeros(500,500);
markerPos = [250 250; 250 260];
markedImg = insertMarker(Img, markerPos, 'size', 3);
imshow(markedImg)
imwrite(markedImg, 'fixedr.jpg')

MATLAB: How to change plot figure resolution

Try your code without the xlim and ylim lines

set(gcf,'units','pixels','position',[500,500,300,300]);
h1 = axes;
set(h1,'position',[0 0 1 1])
set(gca,'XAxisLocation','top','YAxisLocation','left','ydir','reverse');
set (gca, 'visible' , 'off' )
set (gca, 'xtick' , [])
set (gcf, 'color', defaultColor)
axis equal
plot(x,y)

Best Answer

Related Solutions

MATLAB: How to plot points in pixel coordinates

MATLAB: How to change plot figure resolution

Related Question