Can I capture frame more efficiently?

Hi all

I wonder if it is possible to capture frame more efficiently using getframe. I already have done the following:

1) I pre-defined a struct() variable to store the frames before running a for-loop.

2) I have limited the number of frames to capture by (kind of a wired way) I calculated i*length of the dimension I am changing each plot and limited it from around 1500 plots to 150 plot

I wonder if there are other things I can do to make my code more efficient? The thing I am doing is I am plotting three subplots that are updating each time the for-loop runs. (One thing I found is with or without the getframe() command the time difference were around 30seconds. Is getframe() actually this slow or am I doing it wrong?)

Also I wonder if there is a difference with using getframe(gcf) and getframe(figure handle). They seem to have a small time difference (around 5sec) when I run them. I tried google both but couldn'r really process the information, and I kind of get the feeling that there should not be a difference as long as I am only ploting one figure in the loop. Below are how I coded things. There are a bunch of variables in the code defined before it so just to get a sense of what am I doing ;p

t=150;

fEdge(t)=struct('cdata',[],'colormap',[]);

fig=figure('Position',[0.1 0.1 900 300]);

for i=1:t

ind=i*round(size(edgeBOLD,3)/t,0,'decimals');

if ind>size(edgeBOLD,3)

break

end

clf

subplot(1,3,1)

pcolor(edgeRes2D(:,:,ind));

colorbar('southoutside')

caxis('manual')

caxis([0 max(edgeRes2D,[],'all')])

title(sprintf('Original, t= %d',time(ind)))

subplot(1,3,2)

pcolor(edgeBOLD(:,:,ind));

colorbar('southoutside')

caxis('manual')

caxis([0 max(edgeBOLD,[],'all')])

title(sprintf('convn with 1-1-N gaussian, t= %g',time(ind)))

subplot(1,3,3)

pcolor(edgeSMOOTH(:,:,ind));

colorbar('southoutside')

caxis('manual')

caxis([0 max(edgeSMOOTH,[],'all')])

title(sprintf('Smoothdata gaussian, t= %d',time(ind)))

fEdge(i) = getframe(fig);

end

Elapsed time is 60.790442 seconds.

Elapsed time is 33.247113 seconds.

The two time are time of the whole program run with or with out the line

fEdge(i)=getframe(fig);

(but im pretty sure this for-loop is the slowest part of my code so..)

Also not really important but is there a way that I can set the range for colormap for each subplot before I plot them? I don't think I should be setting them inside the loop but the figure and axes handle things are pretty confusing and nothing I have tried worked.

Answer 1

[Image Analyst]

Maybe try getimage(). To pseudocolor the image use ind2rgb().

[Yuxin Tong]

Sadly I dont have the tool box needed for get image, but thank you still for the advice.