Using a Mask file in the command line version of PIVlab

[Susan Lehman]

Hi, I have multiple movies that need to use the same mask during PIV analysis. I've created a mask file using the PIVlab GUI and saved it, but I don't see how to use that file in the command line version of PIVlab.

I see the instructions in the comment in the command line that say "If needed, generate via: imagesc(image); [temp,Mask{1,1},Mask{1,2}]=roipoly;" but I don't quite understand this.

What should I be setting s{4,2} to be equal to? My list of points that will be connected with roipoly? Or something else? 

I've tried to investigate the GUI code, but I don't really understand how to debug and track things in the GUI code, so I can't find what is going on with the mask there.  I see the sections with maskiererx and maskierery but other than copying those bits of code into the command line version, I'm not sure how to proceed.

Thanks much!

[William Thielicke]

You would generate your mask using:

imagesc(imread('my_image_file_that_I_want_to_draw_a_mask_for.jpg'); [temp,Mask{1,1},Mask{1,2}]=roipoly;

eventually save the mask to a mat file:

save('my_mask.mat','Mask');

Then apply this mask using:

load my_mask.mat

s{4,1}= 'Mask';                     s{4,2}=Mask; 

This should work...

[Susan Lehman]

Thank you so much -- that does work perfectly.  I was having a hard time understanding what format to pass the mask in, but it makes sense now.