Finding edges for licence plate

I am doing some research on licence plate detection, I find it hard to detect edges of some licence plates where the intensity difference between the car background and the licence plate is not much. In other words the intensity difference between them is unidentifiable by human eye.

Is there a way to find the rectangular number plate in such scenario.

Below is a sample image of the car.

I have tried Canny edge detector with different thresholds, Tried many other edge detectors but no help.

Could anybody please suggest

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