How to move an image inside a computational grid?

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S
S 2021-3-19
评论： S 2021-3-22
Hello everyone,
I wish to move an image along a particular direction inside a bigger computational grid (the intensity values of the bigger computational grid is zero except of image region). Size of computational grid is ((X, Y) = (256 , 128)) and an image is place inside this computational grid at (216:266, 44:47).
So how can move the image along the x-direction (e.g. 216 --> 100 with step size , so the position of the image will become (116:166, 44:47)) place inside the bigger computational.
Suggestion/Help please.
Thank you.

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采纳的回答

darova
darova 2021-3-21
Try this
clc,clear
[x,y] = meshgrid(0:10); % main grid
[x1,y1] = meshgrid([4 6]); % small rectangle
surf(x,y,x*0,'facecolor','b');
dx = rand(1,10);
dy = rand(1,10);
h = surface(x1,y1,x1*0+0.1,'facecolor','r');
for i = 1:length(dx)
set(h,'xdata',x1)
set(h,'ydata',y1)
pause(0.5)
x1 = x1 + dx(i);
y1 = y1 + dy(i);
end
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darova
darova 2021-3-21
  • Could you please help me understand (x1*0 + 0.1) ??
Its Z coordinate. BIg mesh is Z=0, so the small rectangle should be on top, i made z=0.1

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更多回答（1 个）

KSSV
KSSV 2021-3-19
I = imread('peppers.png') ;
[X,Y] = meshgrid(1:100,1:100) ;
plot(X,Y,'r') ;
hold on
plot(X',Y','r') ;
image([20 50],[20 50],I)
set(gca, 'YDir','reverse')
  1 个评论
S
S 2021-3-19
Thank you very much for the help. But the my situation is different then what you have considered.
Its like I want to move a set of point (about 20-25) that is inside the red box (which i call as an image) and while we move the in upward direction I dont wish to change the intensity value .. just the position of the points along the x-axis.

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