How to mark foot pressure

I have a Matlab code that tracks foot pressure over a representative walk. I then split this to show 3 representative footprints, I would like the foot pressure to also appear on this image. The code used initially to mark the representative walk is:

for k = 1 : numPhases;
    figure, set(gcf, 'Units','Normalized','OuterPosition',[0 0 1 1]);
    kk = num2str(k);
    thisPhase = transpose(Phases(k).Stance);
    imshow(thisPhase,map1); title(['Walk ',char(kk)]);
    hold on
    xCOF = Phases(k).COF(:,1);
    yCOF = Phases(k).COF(:,2);
    scatter(xCOF,yCOF,2,'k','filled'); set(gca,'YDir','reverse','XDir','reverse');
end

and presents this image:

the following is the image where I would like to have the foot pressure marked:

Any suggestions?

[Martin Colledge]

Hi Denni

I have a research project interest in this area and am novice matlab user. I would like to chat to you regarding your work and share some ideas.

my email address is

[e-mail]

Thanks in anticipation.

Cheers

Martin

[Roshan]

can you tell me how to create this image of foot?

[DGM]

As I doubt that someone who has been inactive for half a decade is going to answer, the images are pseudocolor representations of plantar pressure mat data. So do you have the hardware?

Answer 1

[Image Analyst]

I would threshold the image and then do a morphological closing on the binary image. This will merge a bunch of blobs into 3 large ones. Then call regionprops to get the bounding boxes. Then crop out with imcrop() and rotate -90 degrees with imrotate().

See my Image Segmentation Tutorial in my File Exchange if you need help. http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862