Determining new x,y location of an object

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Sara 2012-11-28

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If I know the original x,y location of an object, then move it randomly to a different point on an image, how can I determine it's new x,y location?

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John Petersen 2012-11-29

If you moved it, just remember where you moved it to.

Jan 2012-11-30

@Sara: Most likely the problem gets clear, when you post the relevant part of the code.

Of course the information where the parts of the scrambled image are located afterwards are available in your program already. But we cannot guess where or in which format.

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Answer 1

Image Analyst 2012-11-29

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Did you move the object digitally, in code, or did you move it, say, by moving it to a new place in a scene and take another photo of it?

http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

http://www.mathworks.com/matlabcentral/answers/7924-where-can-i-upload-images-and-files-for-use-on-matlab-answers

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Image Analyst 2012-11-29

在 MATLAB Online 中打开

If you move the object by deltaX and deltaY, then obviously the new location is

newX = startingX + deltaX;
newY = startingY + deltaY;

Needless to say, it's new position is (newX, newY). But this is way way too obvious (you wouldn't have even asked about something so trivial and simple) so we must have misunderstood your question. Can you try to describe it in more detail this time?

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Answer 2

Sara 2012-11-29

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The object is moved via code. It is moved to a random location on the image.

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Sara 2012-11-30

Here is my code. I am not sending one tile to the same new location each time. What you say makes sense, I'm just not sure how that works with this:

A=mat2cell(image,[384,384],[256,256,256,256],[3]);

B=randperm(8);

C=reshape(B,2,4);

D=mat2cell(C,[1,1],[1,1,1,1]);

[row,col]=find(C==1)

D(row,col)=A(1,1)

[row,col]=find(C==2)

D(row,col)=A(1,2)

[row,col]=find(C==3)

D(row,col)=A(1,3)

[row,col]=find(C==4)

D(row,col)=A(1,4)

[row,col]=find(C==5)

D(row,col)=A(2,1)

[row,col]=find(C==6)

D(row,col)=A(2,2)

[row,col]=find(C==7)

D(row,col)=A(2,3)

[row,col]=find(C==8)

D(row,col)=A(2,4)

scram=cell2mat(D); fig3=figure('Visible','on'); imshow(scram)

Sara 2012-11-30

编辑：Sara 2012-11-30

the intial location of the pedestrian is located in an excel file that i upload, and I am running this for about 500 images.

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Answer 3

John Petersen 2012-11-30

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在 MATLAB Online 中打开

You know which cell in A that the pedestrian is located, right? Say it's the A(r,c) cell. Then,

ped = (c-1)*2 + r; % location of the pedestrian in A strung out, 
                   % i.e. A(ped) = A(r,c)
B=randperm(8);
C=reshape(B,2,4);
D=mat2cell(C,[1,1],[1,1,1,1]);
for i=1:8
   [row,col]=find(C==i) % move tile i to row,col
   D(row,col)=A(i);  % Build new image 
   if (C(i)==ped)
        Row_newped = row;  %FOUND PEDESTRIAN in New image
        Col_newped = col;
   end
end