Remove the background / cropping the region of interest

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Hello,
I'm doing a project to estimate the freshness of egg. I want to crop the egg image for further analysis or remove the black background. Though the background is black, when I take the G component for further analysis, intensity value of black background varies from 0 to 20( due to some leakage of light or some illumination problem as the expt is done using a black box). This variation is undesirable while taking the image for further processing.
I want to either crop the egg image( oval shape) or I want to set the black bg in G component to zero ie, no variation from 0. It's really urgent. Please help me in this regard.

Accepted Answer

Image Analyst
Image Analyst on 15 Apr 2014
See attached code that will produce this figure:

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