MATLAB: If ROI is already outlined how to mask ROI without using imfreehand function output parameters

Image Processing Toolboxroi without imfreehand function

I have detected the region of interest in an image without using imfreehand function. Now I want to mask inside the ROI which I have outlined in red line as shown in below image. http://img534.imageshack.us/img534/4272/output3l.jpg

I am stuck up with following part of code.

hFH = imfreehand();

binaryImage = hFH.createMask();

xy = hFH.getPosition;

I dont want to use imfreehand as I have already detected ROI. So in above code what should I assign to hFH?

Can somebody please help me with this? Thanks in advance for your help!

Best Answer

I'm not sure what you're asking. What is "the ROI" - the area you drew with imfreehand(), or the white binary blob inside that, or the whole image?

And what does " the similar values from the "Region of Interest"" mean? Do you mean the gray levels in that ROI?

I don't understand what you're going to "apply the mask" to? What is the mask anyway? Is it the same as the ROI, or is it something else?

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MATLAB: How to extract a region of white pixel bounded by black pixel from white background

It looks like a binary image. If it is, call imclearborder

binaryImage = imclearborder(binaryImage);

This will get rid of all white/1/true regions touching the edge of the image.

MATLAB: Calculating the number of pixels inside a freehand region.

Since you are already using imfreehand, you can use the method named createMask available in the imfreehand object to rasterize the marked region into a binary image. Then you can just use logical AND to combine the binary image with your original image and sum over all the pixels in the image to get the desired count. I think the code would look something as follows. Say your image is called I.

figure, imshow(I)
f = imfreehand; 
% Then draw the region using imfreehand tool
bw = createMask(f);
outI = bw.*I;
numPixelsInsideRegion = sum(outI(:))

Best Answer

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MATLAB: How to extract a region of white pixel bounded by black pixel from white background

MATLAB: Calculating the number of pixels inside a freehand region.

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