not able to extract tumour for some images.

I used one code to extract tumour from the images. I am able to extract them when the tumour background is black. i.e, for untitled12,untilted123 images. Im not able to extract the tumour when the tumour is black. Ive tried invert colours but im not getting the output. Image is Slice104.

Answer 1

[Image Analyst]

Threshold for dark stuff rather than bright stuff. Just use

grayImage < someThreshold;

[rohith bharadwaj]

how to find that threshold. it should be generalised for all other images also.

[Image Analyst]

You have to examine the histogram and try to figure out some algorithm to match what you'd manually do with an interactive thresholding app like mine: https://www.mathworks.com/matlabcentral/fileexchange/29372-thresholding-an-image

Anyway, simple global thresholding is probably not a good method for finding tumors unless it's for some simple, student project.

[rohith bharadwaj]

yes thank you. can I get that minimum threshold value from that function. .Is there method to directly to get the binarized image that got from the code

[Image Analyst]

Like I said, you have to write the code that determines the threshold from the histogram. There is no one algorithm that works in all cases.

I'm attaching an example tumor finding program.

[rohith bharadwaj]

when I take image < threshold(83). I'm getting tumour boundary but it is not continuous. so what to do