Extracting Particular Object from image

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Umer Siddique
Umer Siddique 2014-11-28
评论： Image Analyst 2018-8-8
Hi everybody i have applied k-mean clustering on this image
i got 3 cluster but this was of my interest as shown in below picture but problem is this that i only want to extract infected cell shown in the below picture in square box i don't want rest of the things kindly help me how to achieve this.Thanks in Advance.

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Image Analyst
Image Analyst 2014-11-29
That might not be a good method if it's not automatically choosing the correct clusters. I'd recommend you try color segmentation by HSV color space. See http://www.mathworks.com/matlabcentral/fileexchange/28512-simple-color-detection-by-hue - it will let you fine tune the thresholds to get exactly the color purple you want and not all those other colors. Try that and attach your code if you can't get it working.
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Umer Siddique
Umer Siddique 2014-11-29
can you please write some code for this.this will be very helpful for me to understand.
Image Analyst
Image Analyst 2014-11-29
Try the attached. I did the adaptations I suggested. I'm thresholding pretty much on only the saturation image now. I also knocked down the smallest allowable blob to 220 pixels so that in image #5 it would still find something.

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r r
r r 2018-8-8
I have an image I want to extract the small areas of black color within the blue How so؟؟؟
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Image Analyst
Image Analyst 2018-8-8
Start your own new, separate question and I'll tell you how you can invert the image and use imclearborder() to do it.

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