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You do not need edge and contours detectors, but algorithms designed for finding text in scenes. Do not reinvent the wheel and have a look at the text detection algorithms that are plug and play:

• CNTP: https://github.com/eragonruan/text-detection-ctpn
• EAST: https://github.com/argman/EAST
• SWT: https://github.com/azmiozgen/text-detection

And there are tons of other approaches out there. Personally I have been using the stroke width transform approach quite successfully.