HSV Help - Imshow two thresholds

Hey all,

I'm trying to display the following image in HSV, and setting the red and green thresholds. How can I do it so the user specifies with an input? Cheers

redlevel = input('Please insert a value between 0 and 1 for Red.\n','s');
    red=str2double(redlevel);
    objectofintrest = (objectofintrest(:,:,1)<(red));

      greenlevel = input('Please insert a value between 0 and 1 for Green.\n','s');
      green=str2double(greenlevel);
      objectofintrest = ((objectofintrest(:,:,2))<(green));
  %     redgreen= [redlevel & grelevel];
      imshow(objectofintrest, red, green);

[Image Analyst]

Did that work? By the way, it appears to be RGB color space, not HSV color space. See my interactive thresholding app: http://www.mathworks.com/matlabcentral/fileexchange/29372-thresholding-an-image

[Ian]

No it didnt work. Do you only use (:,:,1) in RGB? I converted the image to HSV earlier in the program. Ill check it out, thanks alot.

[Image Analyst]

I don't know what you are trying to do. Why are you using the word red when you're thresholding the hue channel and the red hues are less than about 0.1 and more than about 0.9?

[Ian]

Updated to this, which gets a HSV image, but trying to convert it to binary from that.. Any ideas?

    redChannel = objectofintrest(:,:,1);
    greenChannel = objectofintrest(:,:,2);
    redlevel = input('Please insert a value between 0 and 1 for Red.\n','s');
    red=str2double(redlevel);  

    greenlevel = input('Please insert a value between 0 and 1 for Green.\n','s');
    green=str2double(greenlevel);     
    redgreen= red & green;
    imshow(objectofintrest, redgreen);

[Image Analyst]

Is objectofintrest an RGB image or an HSV image? What is the range of it? Between 0 and 255 or between 0 and 1?

Maybe you'd like my thresholding app: http://www.mathworks.com/matlabcentral/fileexchange/29372-thresholding-an-image

Answer 1

[Image Analyst]

Check out my color segmentation tutorials. There is one that works in HSV color space. http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862