Is it possible to add a timestamp watermark to my image in MATLAB 7.6 (R2008a) ?

I would like to superpose a watermark of a timestamp onto my image matrix in MATLAB.

Using the TEXT command, which only works on Figures, does not work as well in my application because saving a figure adds unnecessary axis borders to my image. Rather, I would like to add the watermark directly in memory and then use IMWRITE to write a watermarked matrix to file.

Answer 1

[MathWorks Support Team]

The ability to add watermarks to images is not available in MATLAB.

To work around this issue, refer to a third-party application submitted on MathWorks File Exchange named 'text2im.m' in conjunction with the following example. The file can be located at:

 <http://www.mathworks.com/matlabcentral/fileexchange/loadFile.do?objectId=19896>

The following is the example:

load clown

I = X;

imtext = text2im('foo bar',max(max(I))/2);

textImage = zeros(size(I));

imtextSize = size(imtext);

textImage(1:imtextSize(1),1:imtextSize(2)) = imtext;

I2 = I+textImage;

subplot(131),image(I),colormap(map),title('Original Image')

subplot(132),image(textImage),colormap(map),title('Watermark')

subplot(133),image(I2),colormap(map),title('Watermarked Image')

Note that MathWorks does not guarantee or warrant the use or content of these submissions. Any questions, issues, or complaints should be directed to the contributing author.