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The method is to first design a filter based on wavelet transform and then attenuate the low-frequency part lx after performing wavelet transform of x layer on the picture, and then perform the inverse wavelet transform to achieve high-pass filtering, filtering out various kinds of pictures due to uneven illumination. The noise interference caused by factors highlights the license plate area. In traditional license plate positioning algorithms,https://www.sztigerwong.com, the images are first binarized. For the original grayscale image, there is a signi