Extracting data from a text file.

Question

Saad Saboor 2015-1-15

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/170049-extracting-data-from-a-text-file

回答： D. Ali 2019-4-27

Please help me with this code. Annotations.text contains the positions for five rectangles. How can I extract the values from text file and use it as position for rectangles.

I=imread('avengers.png');
Data = dlmread('Annotations.txt');
[rows, columns] = size(Data);
imshow(I);
rectangle('Position', 'Curvature',[0,0], 'LineWidth', 2, 'EdgeColor','r');

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Geoff Hayes 2015-1-16

Saad - can you provide a sample of the data from the Annotations.text file? We can't offer guidance unless you provide some details concerning the content/format of this file.

Saad Saboor 2015-1-16

在 MATLAB Online 中打开

Thanks for asking sir, have a look at my code.

Image=imread('avengers.png');
Data1 = dlmread('Annotations.txt');
[rows, columns] = size(Data1);
Data2 = dlmread('randPts1.txt');
[rows1, columns1] = size(Data2);
imshow(Image);
hold on;
xRect(row, 1:5)=0;
yRect(row, 1:5)=0;
for row = 1 : rows;
    x1 = Data1(row,1);
    y1 = Data1(row,2);
    x2 = x1 + Data1(row,3);
    y2 = y1 + Data1(row,4);
    xRect(row, 1:5) = [x1,x2,x2,x1,x1];
    yRect(row, 1:5) = [y1,y1,y2,y2,y1];
    rectangle('Position',[Data1(row,1),Data1(row,2),Data1(row,3),...
        Data1(row,4)],'Curvature',[0,0],'LineWidth',2, 'EdgeColor','r');   
end
for row1 = 1 : rows1;
    x = Data2(row1,1);
    y = Data2(row1,2);
    inside = false;
%   See if the x,y is inside any of the rectangles.
    for r = 1 : rows
    inside = inpolygon(x, y, xRect(r,:),yRect(r,:));
    if inside
        break;
    end
    end
    if inside
    % It's inside one of the rectangles, so plot it in red.
    plot(x, y, '.', 'Color', 'green', 'MarkerSize', 15); 
    else
    % It's not inside any rectangle, so plot it in blue.
    plot(x, y, '.', 'Color', 'blue', 'MarkerSize', 15);
    end
end

Annotations.txt contains the positions for five rectangles:

128 131 184
142 116 162
164 151 154
95 94 100
39 208 273

randPts1.txt contains 25 random XY co-ordinates which I have displayed on the picture as Blue points.

My job was to change the color of the points that lie inside a rectangle which I have successfully achieved. Now I have to change the color of the rectangle too but I am not able to write a code for it. This must be the properties of the rectangle:

rectangle('Position',[Data1(row,1),Data1(row,2),Data1(row,3),...
        Data1(row,4)],'Curvature',[0,0],'LineWidth',2,...
        'Linestyle','--', 'EdgeColor','yellow');

Can you give me a general code for this problem (keeping in mind that I only have to change the properties of the rectangle that contains the plotted points) and also tell me where to place it in my code.?

I also have to calculate the Hit-ratio i.e out of these 25 points, how many of them are hitting the faces and I have to calculate the percentage and display the result as a Bar Graph.

I need a general code since I have to perform this experiment 20 times with different random points. Please help.

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Answer 1

Image Analyst 2015-1-16

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/170049-extracting-data-from-a-text-file#answer_165089

The question of plotting and colors was already answered in http://www.mathworks.com/matlabcentral/answers/170028#answer_164948. To answer your current question "How can I extract the values from text file and use it as position for rectangles?" it would be most helpful if you attached the data file and original image like Geoff asked. Make it easy for us to help you. If it's easy we might write code, otherwise we might just give written "directions."