How to obtain an image from meshlsrm plot?

Hi, I have a Digital Elevation Model on a .tif file. In order to visualize a shaded relief version of it, I’m using this code:

A = geotiffread('dem.tif');
info = geotiffinfo('dem.tif');
lat = info.CornerCoords.Lat;
lon = info.CornerCoords.Lon;
RObj = georasterref('RasterSize',size(A),'LatitudeLimit',[min(lat(:)) max(lat(:))],'LongitudeLimit',[min(lon(:)) max(lon(:))]);
worldmap(A,RObj);
cmap = colormap(gray(256));
meshlsrm(A,RObj,[135, 27],cmap);

On the plot that result from meshlsrm, I have to do other elaboration (for example I need to use the canny edge detector, and the the Hough transform). Someone knows a way in order to obtain a gray scale image from meshlsrm?

NOTE:-

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The color displayed is determined by the colormap. You can change it from the default to grayscale with the following command:

colormap gray

Afterward, you can do something like the following to obtain the actual image from the surface object:

image = frame2im(getframe(gcf));
image = rgb2gray(image);
figure; imshow(image);

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How to obtain an image from meshlsrm plot?

How to obtain an image from meshlsrm plot?