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Render RGB text over RGB or Grayscale Image

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12 Mar 2010 (Updated )

Utility which renders text over RGB o grayscale image matrices. (no line feed support)

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Description

by Davide Di Gloria
with the great contribution of Franz-Gerold Url

Render RGB text over RGB or grayscale images of ANY RESOLUTION!

usage:
out=rendertext(target, text, color, pos, mode1, mode2)

target ... MxNx3 or MxN matrix
text ... string (NO LINE FEED SUPPORT)
color ... vector in the form [r g b] 0-255
pos ... position (r,c)

optional arguments: (default is 'ovr','left')
mode1 ... 'ovr' to overwrite, 'bnd' to blend text over image
mode2 ... text aligment 'left', 'mid' or 'right'.

out ... has same size of target

example (generates the sceenshot above):

in=imread('football.jpg');
out=rendertext(in,'OVERWRITE mode',[0 255 0], [1, 1]);
out=rendertext(out,'BLEND mode',[255 0 255], [30, 1], 'bnd', 'left');
out=rendertext(out,'left',[0 0 255], [101, 150], 'ovr', 'left');
out=rendertext(out,'mid',[0 0 255], [130, 150], 'ovr', 'mid');
out=rendertext(out,'right',[0 0 255], [160, 150], 'ovr', 'right');
imshow(out

have fun (and give credit)!

MATLAB release MATLAB 7.8 (R2009a)
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Comments and Ratings (11)
27 Jan 2014 Carsten  
20 Sep 2013 John Morris

Nice functionality. Font size would be good.

25 Apr 2013 Ilya Belevich  
10 Dec 2010 Ilya Belevich

very nice, thank you!

03 Jun 2010 Davide Di Gloria

:)

27 May 2010 Rob Campbell

Fair enough!

15 May 2010 Davide Di Gloria

if you have to write a timestamp or something on a 3000x2000 pixels image, getframe() will shrink the image...

14 May 2010 Rob Campbell

I still don't understand the point. Combining text with getframe gives you more flexibility and still gets the job done easily. This function renders in only one font face and (apparently?) only one size.

14 May 2010 Davide Di Gloria

This function RENDERS the text over any matrix, not over the figure. This function allows you to save the image matrix with imwrite() and not by using getframe(). Please consider re-rating :)

05 May 2010 Rob Campbell

The images are included in the default Matlab install, Stiphu. At least they are on my machine. However am confused by this function. It just seems like an over-complicated and crippled version of the text command. Question to author: What does this function do that the text command does not?

08 Apr 2010 Stiphu

How about adding the pictures you used? Absolutely crab...

Updates
05 May 2010

added missing chars.bmp file, sorry!

05 May 2010

slight modification to description

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