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Problem in thresholding of image

Hi guys

I have the following image

image description

I want to extract the following part circled red in the image as shown

image description

The problem is both the background and the box to extract are white..

How can i perform thresholding such that i get only the box as output.

I am using python 2.7 with cv2

Problem in thresholding of a part of image

Hi guys

I have the following image

image description

I want to extract the following part circled red in the image as shown

image description

The problem is both the background and the box to extract are white..

How can i perform thresholding such that i get only the box as output.

I am using python 2.7 with cv2