Problem filling a contour

I previously asked a question about how to fill a region of interest in Matlab, and got a response that I should use activecontour to identify the envelope of the region then extract the color channels and add back pure red as a binaryImage to fill the ROI. I've been trying to do this but keep running into an error message:

"Undefined function or variable 'binaryImage'."

Do I need to convert to binaryImage, and if so how do I do that?

My code and the input image are attached, any help would be greatly appreciated.

Answer 1

[Image Analyst]

It look like what you call binaryImage is what you previously called "mask" in the code. Change it to say mask and it should work better.

[Matthew Alston]

Ah okay that works perfectly, thanks so much for your help!

[Matthew Alston]

Being pretty familiar with my project, what method would you recommend to analyze the final filled image? The information I need is: How many red-shaded pixels there are, and what percentage of the pixels within the body outline are shaded red. Any help would be much appreciated.