How to measure text letter size in pixels?
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I am trying to put up a letter (x) and measure it's height and width in pixels. I would like to do it for a number of different size fonts. I thought there was a scan command that would start at the top of the screen and scan until it ran into the text, then record that value. I also would like to be able to put up two letter X's and measure the distance in pixels between them.
3 个评论
Image Analyst
2016-10-13
You didn't respond to my "Answer" below. Did you see it? Will that work for you?
回答(2 个)
Image Analyst
2016-10-13
If you have the Computer Vision System Toolbox, try insertText(): http://www.mathworks.com/help/vision/ref/inserttext.html
Walter Roberson
2016-10-14
Create a uicontrol('style','text') and appropriate FontName, FontSize, FontUnits, FontWeight, FontAngle. Do not worry about the Position. You can set the Visibility to off. Once it has been set up, set the uicontrol Units to pixels .
Now for each character to be tested, set the String property of the uicontrol to just that one character, and then ask for the Extent property of the control. This will tell you how big the control would have to be to hold the string. Record it, keep going with the next desired character, or set the FontSize and ask again, and so on.
After you are done, delete the uicontrol.
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Walter Roberson
2016-10-14
If you want to know about how Psychtoolbox positions characters, you need to talk to the Psychtoolbox people http://psychtoolbox.org/
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