I need to divide my matlab output figure into pixels or grid of desired dimension.

Question

h b 2016-11-21

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/313201-i-need-to-divide-my-matlab-output-figure-into-pixels-or-grid-of-desired-dimension

评论： Walter Roberson 2016-11-22

How should it be done. should i save this output figure in another variable?

can "the game of life" coding approach be taken to divide the output figure into pixels.

(also thereafter change colour of the few selected pixels or grid and group them into different categories based on colour and make them move as pointer) i presently dont have image processing toolbox installed Suggest a solution

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

KSSV 2016-11-21

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/313201-i-need-to-divide-my-matlab-output-figure-into-pixels-or-grid-of-desired-dimension#answer_244067

在 MATLAB Online 中打开

clc; clear all ;
% make random data 
data = rand(1000,2) ;
% divide into grid
M = 5 ; N = 5 ;
x = linspace(0,1,M) ;
y = linspace(0,1,N) ;
[X,Y] = meshgrid(x,y) ;
Z = zeros(size(X)) ;
figure
plot(data(:,1),data(:,2),'.r')  ;
hold on
plot(X,Y,'k') ; plot(Y,X,'k')
%%Get points inside for each box 
P = cell(M,N) ;
for i = 1:N-1
    for j = 1:M-1
        A = [X(i,j) Y(i,j)] ;
        B = [X(i+1,j+1) Y(i+1,j+1)] ;
        idx = find(data(:,1) >= A(1) & data(:,1) <B(1)) ;
        idy = find(data(:,2) >= A(2) & data(:,2) <B(2)) ;
        id = intersect(idx,idy) ;
        P{i,j} = [data(id,1) data(id,2)] ;
        % plot points inside first box 
        plot(P{i,j}(:,1),P{i,j}(:,2),'O','color',rand(1,3))
    end
end

2 个评论
显示无隐藏无

h b 2016-11-21

{ % make random data

data = rand(1000,2) ;}

Here if i have a previously generated matlab output figure, i want to use this figure. how is it to be done.

KSSV 2016-11-21

Won't you have a data? You got only figure?

请先登录，再进行评论。

Answer 2

Walter Roberson 2016-11-21

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/313201-i-need-to-divide-my-matlab-output-figure-into-pixels-or-grid-of-desired-dimension#answer_244069

Use mat2cell() to divide your image up into pieces.

It is not obvious to me that cellular automata has anything to do with your question.

If you want to move an image on the display, then image() or imshow() it and record the handle returned, and then to move it, change the handle XData and YData properties.

6 个评论
显示 4更早的评论隐藏 4更早的评论

Walter Roberson 2016-11-21

编辑：Walter Roberson 2016-11-21

Setting the XData and YData would work if you were just moving the sections up/down/left/right, but in that simulation at http://kmarkow.github.io/roundabouts/ the sections need to curve as well.

To handle that, the easiest way might be to use one hgtransform for each section, and set the transform matrices as needed. You would need one hgtransform per section.

Another way of handling it would be to use one patch object for each section with the image displayed on the patch by using texture mapping, and instead of keeping an hgtransform for each section you would modify the patch vertex locations as you went. This would involve transform matrix calculations but not the overhead of an hgtransform for each object (but you would need to store the center coordinates and the orientation for each object.)

In theory you could also manage it all as one single patch object using texture mapping, with a whole bunch of faces that do not happen to connect together, with you modifying the vertex locations as you went. This would involve transform matrix calculations but not the overhead of an hgtransform for each object (but you would need to store the center coordinates and the orientation for each object.)

h b 2016-11-22

Shall be grateful if u could also provide a sample code for the abv or a link for reference

Walter Roberson 2016-11-22

在 MATLAB Online 中打开

Example without rotation

cam = imread('cameraman.tif');
subimages = mat2cell(cam, 16 * ones(1, 16), 16 * ones(1,16));
number_of_subimages = numel(subimages);
X = zeros(1, number_of_subimages);
Y = zeros(1, number_of_subimages);
for subidx = 1 : number_of_subimages
  imh(subidx) = image( subimages{subidx}, 'XData', X(subidx), 'YData', Y(subidx));
  hold on
end
hold off
axis([-100 300 -100 300])
%now move them
for movenum = 1 : 50
  for subidx = 1 : number_of_subimages
    X(subidx) = X(subidx) + randi([-32,32]);
    Y(subidx) = Y(subidx) + randi([-32,32]);
    set( imh(subidx), 'XData', X(subidx), 'YData', Y(subidx));
   end
   pause(1/4);
 end

请先登录，再进行评论。

I need to divide my matlab output figure into pixels or grid of desired dimension.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

回答（2 个）

2 个评论
显示无隐藏无

6 个评论
显示 4更早的评论隐藏 4更早的评论

另请参阅

类别

标签

Community Treasure Hunt

I need to divide my matlab output figure into pixels or grid of desired dimension.

0 个评论 显示 -2更早的评论隐藏 -2更早的评论

回答（2 个）

2 个评论 显示 无隐藏 无

6 个评论 显示 4更早的评论隐藏 4更早的评论

另请参阅

类别

标签

Community Treasure Hunt

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

2 个评论
显示无隐藏无

6 个评论
显示 4更早的评论隐藏 4更早的评论