matlab - Image segmentation in a grayscale image with close intensity levels? -

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here's deal, i'm trying segment capsicum @ lower centre of image using matlab. tried intensity level slicing problem intensity levels close. tried stretching histogram , doing no luck. can me?

https://www.google.co.in/search?q=grayscale+image+matlab&source=lnms&tbm=isch&sa=x&ei=0_ahu6hll9ixuatirikadg&sqi=2&ved=0cayq_auoaq&biw=1366&bih=622#q=+matlab+flower+grayscale&tbm=isch&facrc=&imgdii=&imgrc=awrqu-vbisji3m%253a%3bfy0fngztpyzszm%3bhttp%253a%252f%252fwww.cs.tut.fi%252f~foi%252fgcf-bm3d%252fimages%252fpeppers256_est_s15.png%3bhttp%253a%252f%252fwww.cs.tut.fi%252f~foi%252fgcf-bm3d%252f%3b256%3b256


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