How to extract the license plate region from the image of cars

HI, I want to extract the license plate region from the image of cars with vision assistant. I try to adjust the threshold value, remove small objects. But i still cannot get the perfect license plate region. I have attached 4 images that i am working now. I hope someone can help me to extract that region. Really thanks.
Attachments:
IMG_2029.JPG ‏150 KB
IMG_2031.JPG ‏155 KB
IMG_2089.JPG ‏130 KB

Hi, I have attached my extrated images.. Please check them...
Attachments:
35.PNG ‏17 KB
36.PNG ‏12 KB
37.PNG ‏13 KB

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How to extract the license plate region from the image of cars

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