Overlay a plot on an image
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Hi,
I have to overlay a plot on a image. Here is my code:
Imm = imread('imageLeft.png');
figure()
imshow(Imm)
hold on
plot(pos_sensor_Lx,pos_sensor_Ly,'-o')
where Imm is the image (634x484x3 uint 8) while pos_sensor_Lx and pos_sensor_Ly are two column vectors 3487x1 double with values all normalized between [0;1].
When I plot the vectors and the image separately, I get this results:
Overlaying them, I ideally had to see the scan path well distribuited on the white and red dots of the image. Anyway when I overlay them I can't see the scan path over the image because of the very small values of the vector elements. Here the result I get:
All the values are clustered as shown.
Is there a way to adjust the image dimensions or the value of the vector elements to get the result I want?
Thank you
댓글 수: 4
KALYAN ACHARJYA
2021년 2월 8일
편집: KALYAN ACHARJYA
2021년 2월 8일
@Federica In the image, pixels are positioned based on Indices [0-r] and [0-c] in both in y and x direction. In the 2nd data, the values within 0-1, you may check for the normalize the 2nd data with repect to the 1st one?
Actually how do consider the maping of 2nd data with respect to image indices?
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Kiran Felix Robert
2021년 2월 11일
Hi Federica,
Use the following code as an example to normalize your 2nd data based on the first and overlay it on the image.
Imm = imread('image.jpeg');
figure()
% Synthesis - [0,1] Normalized random data
P = rand(1,50); % -> X-variable
Q = rand(1,50); % -> Y-Variable
% Normalizing with respect to image pixels and quantizing
C = size(Imm)
P = uint16(P*C(1));
Q = uint16(Q*C(2));
% Overlay Plot
imshow(Imm)
hold on
plot(P,Q)
hold off
댓글 수: 3
Skylar Strickler
2022년 3월 29일
Hey Kiran, what would I change to the code above to not only overlay the plot, but then to save that image with the overlayed plot as its own file?
Kiran Felix Robert
2022년 3월 30일
Hi Skylar, just use the 'Get Current figure' and 'Saveas' function to save the figure.
For eg, add the following line after the last line of the above code, this will save the figure as a PNG file named 'saved'
saveas(gcf,'saved.png')
추가 답변 (1개)
Ravi Kumar Pallantla
2022년 8월 10일
There is a script in file exchange to plot data on an image file. Hope it will be helpful to you.
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