Problem with overlapping line on image

I have an image.I have a line .I want to overlap this line on the image. I tried using the below lines.But I am seeing both separate. imshow(x);hold on; houghline(x,r,theta);

Any suggestions please?

Thanks, Mary

[Image Analyst]

I suggest you attach your image with the green and brown frame icon so we can see what you're seeing. Maybe a screenshot even.

http://www.mathworks.com/matlabcentral/answers/728-how-do-i-write-a-good-question-for-matlab-answers

Answer 1

[Sudhanshu Bhatt]

Hi Mary,

It will be helpful if you can explain what workflow are you trying to achieve? Do you need to just plot a line on the image? Or the requirement is to highlight a line segment extracted by HOUGHLINES function?

Case 1: To draw a line on an image can be done from the code below:

    % Read an image, create figure and show an image on the current Figure
    % The image is provided with MATLAB, it can be found by executing 
    % >> which -all autumn.tif
    img = imread('autumn.tif');
    figure, imshow(img);

    % Use hold on so we can retain current plot while plotting line
    hold on;

    % Plot the new line
    plot([0,200],[10,200],'Color','r','LineWidth',2)

    %Removing hold on the current plot
    hold off;

Case 2: If you want to extract line segments based on Hough transform using HOUGHLINES and highlight them by drawing a line on the plotted image, please follow the example mentioned in the link below:

Extract line segments and highlight lines

If this does not resolve your issue, please create a Technical Support Request by visiting the link below:

Create Technical Support Request

Thanks

Sudhanshu Bhatt