Determine the axis range of the graph image
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Trong Link
el 25 de Oct. de 2021
Comentada: yanqi liu
el 5 de Dic. de 2021
I'm working on a small project on digitizing an image of a graph. I have a graph image as input and output as coordinate value (x,y) pairs of the graph in that image. Now I'm having a hard time determining the range of values of the axes. I want to use OCR to recognize the labels along the axes. But I don't know how to implement it. Can someone help me?? Here is an example of a graph image. I want to determine the min and max values of the x-axis (-20 and 20) and the y-axis (-1 and 6)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/777828/image.jpeg)
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yanqi liu
el 26 de Oct. de 2021
sir,please check the follow code to get some information
clc; clear all; close all;
im = imread('https://www.mathworks.com/matlabcentral/answers/uploaded_files/777828/image.jpeg');
bw = im2bw(im);
bw = ~bw;
bw2 = bwareaopen(bw, 1200);
bw(bw2) = 0;
bw = logical(bw);
bw3 = imclose(bw, strel('line', round(0.05*size(bw,1)), 90));
bw3 = imclose(bw3, strel('line', round(0.05*size(bw,2)), 0));
rs = sum(bw3, 2); cs = sum(bw3,1);
[~,ind1] = max(rs); [~,ind2] = max(cs);
y = 1:size(bw,1); x = 1:size(bw,2);
pt1 = [x(:) repmat(ind1,length(x), 1)];
pt2 = [repmat(ind2,length(y),1) y(:)];
bw3 = bwselect(bw3, [pt1(:,1); pt2(:,1)], [pt1(:,2); pt2(:,2)]);
bw(~bw3) = 0;
bw4 = imclose(bw, strel('line', round(0.05*size(bw,2)), 0));
bw41 = bwselect(bw4, [pt1(:,1)], [pt1(:,2)]);
bw42 = bwselect(bw4, [pt2(:,1)], [pt2(:,2)]);
bw42(bw41) = 0;
bw41 = logical(bw41); bw42 = logical(bw42);
[r1,c1] = find(bw41); [r2,c2] = find(bw42);
[~,ind1] = min(c1); [~,ind2] = max(c1);
[~,ind3] = min(r2); [~,ind4] = max(r2);
bw5 = bwselect(bw4, [c1(ind1) c1(ind2) c2(ind3) c2(ind4)], [r1(ind1) r1(ind2) r2(ind3) r2(ind4)]);
[L,num] = bwlabel(bw5);
stats = regionprops(L);
wh = 5;
bws = [];
figure; imshow(im);
for i = 1 : num
bwi = bw;
bwi(L~=i) = 0;
recti = stats(i).BoundingBox;
hold on; rectangle('Position', recti, 'EdgeColor', 'r', 'LineWidth', 2, 'LineStyle', '-');
recti = [recti(1:2)-wh recti(3:4)+2*wh];
bws{end+1} = imcrop(bwi, round(recti));
% use ocr or cnn
end
figure;
montage(bws, 'Size', [2 2], 'BackgroundColor', 'w', 'BorderSize', [3 3])
2 comentarios
yanqi liu
el 5 de Dic. de 2021
yes,sir,if we can get the figure,may be use the handle to get data
of course,if just use image,the image may be use imresize to make it bigger,and use some interactive to get the effect value
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