I want to add grid on my image in matlab GUI

Question

Uzair 2013-5-15

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/75864-i-want-to-add-grid-on-my-image-in-matlab-gui

I have a problem. Below is my code...when ever i check the box, the image is replaced with blank screen with a vertical line in middle..Help me please

function show_grid_Callback(hObject, eventdata, handles) % hObject handle to show_grid (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) if (get(handles.show_grid, 'Value')) % rgb = imread('IK.jpg');

 imshow(handles.img,'Parent', handles.axes3);
hold on
M = size(handles.img,1);
N = size(handles.img,2);
a=str2double(get(handles.edit3, 'String')); b=str2double(get(handles.edit5, 'String'));

for k = 1:a:M x = [1 N]; y = [k k];

    plot(x,y,'Color','black','LineStyle','-','Parent', handles.axes3);
    set(findobj('Tag','MyGrid'),'Visible','on')
%   plot(x,y,'Color','k','LineStyle',':');
end
for k = 1:b:N x = [k k]; y = [1 M];
    plot(x,y,'Color','black','LineStyle','-','Parent', handles.axes3);
    set(findobj('Tag','MyGrid'),'Visible','on')
%     plot(x,y,'Color','k','LineStyle',':');
end
hold off else imshow(handles.img,'Parent', handles.axes3); end % Hint: get(hObject,'Value') returns toggle state of show_grid guidata(hObject, handles);

2 个评论
显示无隐藏无

Image Analyst 2013-5-15

What is the point of the set(findobj) line?

Uzair 2013-5-16

I was trying something i found in another question...anyway...I commented it out later

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

David Sanchez 2013-5-16

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/75864-i-want-to-add-grid-on-my-image-in-matlab-gui#answer_85652

在 MATLAB Online 中打开

Image Analyst is right. I simplified the code to this:

I = imread('cameraman.tif');
imshow(I) 
hold on
M = size(I,1);
N = size(I,2);
a=5; 
b=10;
for k = 1:a:M
    x = [1 N]; 
    y = [k k];
    plot(x,y,'Color','black','LineStyle','-');
    set(findobj('Tag','MyGrid'),'Visible','on')
end
for k = 1:b:N 
    x = [k k]; 
    y = [1 M];
    plot(x,y,'Color','black','LineStyle','-');
    set(findobj('Tag','MyGrid'),'Visible','on')
end
hold off

And the desired grid shows up. The problem might be in the figure handle.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 2

David Sanchez 2013-5-16

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/75864-i-want-to-add-grid-on-my-image-in-matlab-gui#answer_85642

在 MATLAB Online 中打开

You get a vertical line because you are plotting a vertical line. The values of both elements of your x array are the same

x=[k k];

which will end up in a vertical line whatever the values of y are.

... ... for k = 1:b:N x = [k k]; y = [1 M];

    plot(x,y,'Color','black','LineStyle','-','Parent', handles.axes3);
    set(findobj('Tag','MyGrid'),'Visible','on')
%     plot(x,y,'Color','k','LineStyle',':');
end

3 个评论
显示 1更早的评论隐藏 1更早的评论

Image Analyst 2013-5-16

But he didn't always have the same x. k went from 1 to N in steps of b and he had hold on so it should have drawn and retained lots of vertical lines, not just one. Just off the top of my head it looks like he should have had vertical lines at 1, (1+b), (1+2*b), .... etc.

Uzair 2013-5-16