Identify the legend box in any image

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Umar Farooq Ghumman
I need to process images that are input by the user. Sometimes the user may provide an image which has legend bar (as shown in the example). I need to recognize and locate these small boxes. How can i do that?
pic.png
After binarization:
pic.jpg
I need to identify this box at the bottom and locate its cordinates.

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