Extracting X axis and Y axis data from spectrogram figure

How to get the x axis and y axis data from the spectrogram figure or plot. The code that I use ,

b=openfig('spec.fig');

h = findobj(gca,'Type','line')

x=get(h,'Xdata');

y=get(h,'Ydata');

.I need time and frequency data from X axis and Y axis but I get empty values in both x and y. Kindly suggest a solution for this. Thanks...

Answer 1

[Sakz]

Spectrogram doesn't give you "Plot Lines" on axes. What you get is an "Image".