Create BW image of a Function

Hi,

I am wondering how one would go about creating a BW image of a function? So, say I have a function y = x^2. I can plot that pretty easily with "plot", however I'd like to create a BW image where a parabola ~2 pixels thick is white and the rest are black, for template matching purposes. Thoughts?

-Jen

Answer 1

[Image Analyst]

Try using getframe() after you do the plot. You can also set the 'Color' and 'LineWidth' properties when you plot to specify the line color and width. There is a similar property for the background color though I don't know what it's called.

Or you can use export_fig() to save the whole figure or axes into an image file on disk. Or use saveas().

[John]

If possible, I'd like to not actually make a plot, just generate the appropriate binary matrix to use later in the program. This would be called hundreds of times.

[Image Analyst]

This is possible. Just follow the example in the FAQ where they drew a circle and ellipse into an image: http://matlab.wikia.com/wiki/FAQ#How_do_I_create_a_circle.3F