Is it possible to find out the x and y coordinates of the line plot in a JPEG photo?

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Kian Azami 2018-2-25

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https://ww2.mathworks.cn/matlabcentral/answers/384673-is-it-possible-to-find-out-the-x-and-y-coordinates-of-the-line-plot-in-a-jpeg-photo

评论： Kian Azami 2018-2-27

Jpeg_Diagram.JPG

I have a diagram in jpeg and I want to find the x and y coordinates of the plot in the image. I have attached the image to the question. Do you have any idea?

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Answer 1

Chandani Madnani 2018-2-27

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编辑：Chandani Madnani 2018-2-27

https://www.mathworks.com/matlabcentral/answers/294805-how-to-extract-x-y-data-and-coordinate-pixel-value-and-location-from-an-image-using-matlab

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Kian Azami 2018-2-27

在 MATLAB Online 中打开

I have used another method to extract the data.

Image = imread('YourImage.jpeg');
I = imshow(Image);
I.CData = I.CData(Max_Y_Pixel:min_Y_Pixel,min_X_Pixel:Max_X_Pixel,:);
[x,y] = meshgrid([min_X:(Max_X-min_X)/(size(Image.CData,2)-1):Max_X],[min_Y:(Max_Y-min_Y)/(size(I.CData,1)-1):Max_Y]);
z = double(I.CData(:,:,3)); % Or Red (1), Or Green(2), Or Blue(3)
m1 = surf(x,y,z);
ind = find(m1.ZData<'Your Condition')
X1 = m1.XData(ind);
Y1 = m1.YData(ind);
figure
plot(X1,Y1,'marker','.','markersize',10,'linestyle','none')