Storing and update xy coordinate in realtime video

while ishandle(himg)
    trigger(depthVid);
    [depthMap,~, depthMetaData] = getdata(depthVid);

imshow(depthMap, [0 4096]);

    if sum(depthMetaData.IsSkeletonTracked) > 0
        skeletonJoints = depthMetaData.JointDepthIndices(:,:,depthMetaData.IsSkeletonTracked);
        hold on;
        plot(skeletonJoints(:,1), skeletonJoints(:,2),'*');
        hold off
    end
end

Is there any way i can update the data that i store in depthMetaData as shown in the coding? if yes what should i add in ? if no , is there other way around?

Answer 1

[KSSV]

iwant = cell([],1) ;
count = 0 ;
while ishandle(himg)
    count = count+1 ;
    trigger(depthVid);
    [depthMap,~, depthMetaData] = getdata(depthVid);
    iwant{count} = depthMetaData ;
imshow(depthMap, [0 4096]);
    if sum(depthMetaData.IsSkeletonTracked) > 0
        skeletonJoints = depthMetaData.JointDepthIndices(:,:,depthMetaData.IsSkeletonTracked);
        hold on;
        plot(skeletonJoints(:,1), skeletonJoints(:,2),'*');
        hold off
    end
end

[Ryan]

Hi thank you for replying, I attached a picture about depthMetaData. i need to update the value inside depthMetaData.JointWorldCooridnates so i follow your idea and do something like this

 while ishandle(himg)
    trigger(depthVid);
    [depthMap,~, depthMetaData] = getdata(depthVid);
    imshow(depthMap, [0 4096]);

    if sum(depthMetaData.IsSkeletonTracked) > 0
        skeletonJoints = depthMetaData.JointDepthIndices(:,:,depthMetaData.IsSkeletonTracked);
        hold on;
        plot(skeletonJoints(:,1), skeletonJoints(:,2),'*');
        hold off
   end

    if sum(depthMetaData.IsPositionTracked) > 0

        count = count + 1;
        iwant{count} = depthMetaData.JointWorldCoordinates(5,:,1)%5 Shoulder Left
end

but the result i get is

iwant = 

Columns 1 through 3

    [1x3 double]    [1x3 double]    [1x3 double]

Columns 4 through 6

    [1x3 double]    [1x3 double]    [1x3 double]

Columns 7 through 9

    [1x3 double]    [1x3 double]    [1x3 double]

It doesn't update the value instead show me [1x3 double] did i miss something?

[KSSV]

It saved values of every iteration......

[Ryan]

so the value is updated but only appear in the form of [1x3 double] and not numerical?

[KSSV]

It is numerical.....you can access by iwant{1}, iwant{2} etc,.