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How to measure rendered text in Matlab? – Artificial Intelligence

Is it possible to know text dimensions in Matlab?

For example, is it possible to know the following measures

enter image description here

UPDATE

I need no image processing. I know I can deduce the location of baseline of “g” letter with simple commonly used artificial intelligence 🙂 This is not what I want. I want Matlab give me what it has, namely, the font metrics. If it can’t then the answer is “Matlab can’t”.

UPDATE 2

Currently I am trying to do via Java interface like this

figure_h=figure;
axes_h = axes('Position', [0, 0, 1, 1], 'Units', 'pixels');

s='g';
x=200;
y=200;

fontName = 'Times New Roman';
fontSize = 48; % will be in points

text('String', s, 'Units', 'pixels', 'Position', [x y], 'FontName', fontName, 'FontUnits', 'points', 'FontSize', fontSize);

% make equivalent Java font
jFont=java.awt.Font(fontName,java.awt.Font.PLAIN,fontSize);

% accessing metrics object
jFrame = get(figure_h,'JavaFrame');
jCanvas = jFrame.getAxisComponent;
jGraphics=jCanvas.getGraphics;
jMetrics=jGraphics.getFontMetrics;

%rectangle('Position', [x, y, jMetrics.charWidth(s), jMetrics.getDescent]);

but getting null pointer exception at getFontMetrics.

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2

Answers


  1. 0

    You can get an image of the font using

    fh = figure;
text( 0, 0, 'frog', 'FontName', 'tahoma', 'FontSize', 30 );
axis off;
f = getframe( fh );
bw = rgb2gray(f.cdata)==0;

    Now you have bw as a binary image of the fonts (in this example tahoma size 30). You may proceed using regionprops (especially 'BoundingBox' property) to compute the desired measures (in pixels).

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  2. 0

    If the intention is to get the font metrics, you need to create a dummy Graphics object like a TextField, something like this

    fontName = 'Times New Roman';
fontSize = 48; % will be in points

jText = java.awt.TextField('');
jFont = java.awt.Font(fontName, java.awt.Font.PLAIN, fontSize);
jMetrics = jText.getFontMetrics(jFont);
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